Quickcalc Quickcalc Quickcalc Quickcalc

It is a self-contained desktop application for Windows that installs in seconds, runs offline, and comes with a 30-day free trial — no account to create, no recurring fees. A one-time licence covers the Windows version.

What Quick Calc models

Quick Calc models 15 fee types across 10 built-in marketplaces: the final-value commission each marketplace takes on a sale; regulatory fees such as eBay’s compliance charge; VAT on fees, handled correctly with a simplified view for home sellers; fixed order and per-item fees — the flat charges added per order or per item; enforced ad fees, the fixed advertising percentage you cannot opt out of on platforms like Etsy; charity donations and top-rated or seller discounts; low-order threshold penalties when an order falls below a set value; category fees for higher-rate categories like electronics or watches; and foreign-sale fees for orders shipped internationally.

That is every fee most sellers know exists but cannot easily track to the penny. Quick Calc puts them all in one calculation.

Ten marketplaces, default rates you can edit

Quick Calc loads default fee values for eBay, Etsy, Shopify, Facebook Marketplace and more, so you start from a realistic baseline rather than a blank form. The defaults are a starting point — you can edit them to match your actual account, because the rates your account experiences are not always the rates quoted in the help pages.

The numbers that matter before you list

When you press Calculate, Quick Calc rolls every cost into the figures that decide whether a listing is worth making: your net sale after all fees, your total costs, your profit, your margin, and the break-even price — the exact price at which the item stops losing money. The break-even price is the single most useful number a seller can have before listing. It is the floor below which a listing loses money, and knowing it before you list is the difference between pricing with your eyes open and pricing blind.

Mini-tools for the what-if questions

Alongside the main calculator, Quick Calc includes focused mini-tools: a VAT tool to add or remove VAT on any figure for invoices and gross-price checks; a margin calculator to work from a cost and desired markup to a sale price and margin; a discount calculator to see instantly what 5%, 10% or 20% off does to a price; and a free shipping calculator to decide whether offering free postage still leaves a profit.

Why not a spreadsheet

A spreadsheet rebuilt for every listing misses fee logic that changes between marketplaces, gets VAT on fees wrong, does not compute break-even automatically, stays static when marketplaces change rates, and has no built-in tools for the what-if questions. Quick Calc keeps the logic in one place, handles VAT on fees correctly, computes break-even automatically, and notifies you of updates with live help and built-in recovery tools.

Quick Calc Marketplaces for Windows is a product of CritchCorp Computers Ltd. The free 30-day trial is fully functional — continued use after the trial requires a licence. Fee and profit figures are estimates based on the values you enter and the rates available at the time; marketplaces change their fees, and actual results vary.

You arrive at a machine you have never seen before. The client describes the problem. You give a rough estimate. Then you open the case and discover the spec is nothing like what you expected — the RAM is half what you assumed, the storage is a cheaper model than the one you priced, the GPU is not the one in the quote.

Now the quote is wrong. Now you need to go back and revise it. The client is waiting.

**PC Audit eliminates the blind quote.** Boot any machine from a single USB stick and get a full, accurate spec report in about ten seconds. No agents, no network, no software installation — just plug in, boot, and read.

PC Audit from our shop.

PC Audit product page.

## What a field engineer actually needs to know

The spec report from PC Audit covers exactly what matters for quoting and diagnosis.

**CPU.** Exact model, core count, thread count, and clock speed. Not “i7″ — the actual i7 model, generation, and whether it is the U-series, H-series, or desktop part that changes performance and price.

**RAM.** Size, type, speed, and channel configuration. Know whether you are looking at 8 GB or 16 GB, DDR4 or DDR5, single-channel or dual-channel — because that changes both the repair and the upgrade quote.

**Storage.** Exact model, capacity, interface, and health status. A quoted storage replacement needs the right part. A health check tells you whether the drive is failing before you quote the repair.

**GPU.** Discrete vs integrated, exact model, VRAM. Essential for quoting graphics work, gaming rigs, and workstation repairs where the GPU is the expensive part.

**OS and activation.** What is installed, whether it is activated, and what edition it is. Affects licensing quotes and replacement decisions.

**Motherboard and BIOS.** Model, chipset, and date. Tells you what upgrades are actually possible and what the machine can support.

All of this in a clean, readable PDF you can either read on-screen or save for the job file.

## Why USB boot matters on client sites

Client machines are not your machines. You cannot install software on them. You cannot rely on their network. You cannot assume they have the tools you need.

A USB boot sidesteps all of that. The audit runs from the USB, reads the hardware directly, and writes the report. When you remove the USB, the machine is exactly as it was — no leftover software, no changed settings, no trace of the audit.

That matters for client confidentiality. The client’s machine stays the client’s machine. You get the information you need without touching anything else.

## One USB covers the whole job

Carry PC Audit on the same USB as the rest of your toolkit. Boot Windows machines and Linux machines from the same stick. Get the same clean spec report from either.

No second USB for Windows, no third for Linux. One stick, every machine, ten seconds per spec.

## The cost of a blind quote

An accurate spec takes ten seconds with PC Audit. A wrong quote can cost hours

Related articles

– PC Audit for IT Asset Management: Inventory Without Agents or Network Access
– PDF Pilot for Field Engineers: PDF Work on Client Sites Without Internet
– NetPeek for Field Engineers: Network Audits on Client Sites
– Quick Calc for Multi-Platform Sellers: Comparing Fees Across eBay, Etsy, Shopify, and Amazon

PC AUDIT

Ten-Second Spec Checks Before You Quote

Features

• Works on Linux and Windows from USB
• Full Spec in About 10 Seconds
• CPU, RAM, Storage, GPU Detail
• No Agents or Network Needed

Never good – the client waiting, revising the price, ordering the wrong part, discovering mid-repair that the machine needs more than you quoted.

Ten seconds of scan time is cheaper than any of those outcomes. And it makes you look more professional, not less — you give accurate quotes because you know the machine, not because you guessed.

**PC Audit for field engineers: know the machine before you quote the repair. Ten seconds, one USB, accurate every time.**

Pc Audit Pc Audit Pc Audit Pc Audit Pc Audit

The report is printable, saveable, and emailable. It runs entirely from the USB stick — nothing is installed on the machine you audit, and nothing is left behind when you remove the stick. A bundled Python runtime is included, so it works even on a machine with no Python installed.

What you get

A preloaded USB flash drive with PC Audit on it, ready to run. Plug it in, run the matching launcher — Run-Windows.bat on Windows or ./Run-Linux.sh on Linux — and the audit starts. Around 10 seconds later you have a PDF spec report covering the processor, memory with per-slot detail, motherboard and BIOS, graphics, storage and partitions, installed software with versions, and recent system-log errors flagged where they suggest a problem.

The report can be saved and attached in your usual email program, or sent directly through the built-in SMTP option — enter your server details once, confirm with the Test button, and the PDF is attached and sent automatically.

Who it is for

Repair shops and service desks use it on the bench to put a printed spec report in the customer’s hand with the repair note — specs, serials and BIOS details to hand, RAM and SSD upgrades quoted with certainty, failing drives and system log errors caught before they become returns. Onsite and field engineers arrive with one USB stick and leave with a full report — nothing installed on the customer’s machine, nothing left behind, the same drive working on Windows or Linux, the PDF handed over on site or emailed before leaving. Corporate IT and MSPs audit workstation after workstation on one licence, building a hardware, software and firmware picture across the estate — serials, specs and installed software for asset records, each report printed, filed, or attached to a ticket.

One licence, two platforms

PC Audit is a product of CritchCorp Computers Ltd. One USB licence covers the same stick on a Windows PC or a Linux PC. The report is a clean A4 PDF you can save, print, or email. Nothing is installed on the machine you audit. The licence is a one-time purchase.

PC Audit is available now on the CritchCorp store at store.cc-computers.com/collections/software.

Netpeek Netpeek Netpeek Netpeek Netpeek

It ships preloaded on a USB flash drive — nothing to download, nothing to install. Plug it in, pick a scan, press Scan.

What NetPeek finds

A NetPeek scan lists every responding host on your subnet with its IP address, MAC address, hardware vendor and hostname. Unknown devices — those with no vendor and no hostname — are flagged so you can investigate. That is the device that is not yours, the one you did not authorize, the one worth a closer look.

The standard scan covers IP subnet scanning — enter any CIDR, such as 192.168.1.0/24, or leave it blank for your local subnet. WiFi scanning shows the wireless networks available to you. Ping checks any IP to see if it responds. DNS lookup resolves any type of DNS record. UDP port scanning checks standard ports or one specific port on a device — 27 common ports in one click. And results can be exported to CSV, openable in any spreadsheet.

Offline vendor lookup is bundled — MAC addresses are mapped to manufacturers from a local database, so the vendor lookup works with no internet connection.

Why no admin rights matters

NetPeek does not need admin rights. It fills the OS ARP table with a parallel ping sweep, then reads that table — no raw sockets, no Nmap, no root. That means you can run it on a machine where you do not have administrator privileges, which is often the case on a customer’s site or a corporate workstation.

Who it is for

IT professionals use it to audit a network quickly — every device, every open port, in one window. Small office owners use it to see what is connected to their router, often with some surprise at how many devices are quietly on the network. Anyone who wants to know what is on their network and what is exposed uses it to turn a network they cannot see into a clear, readable list.

NetPeek is a product of CritchCorp Computers Ltd. One licence covers Windows and Linux. It ships preloaded on a USB flash drive. No admin rights are required. Results can be exported to CSV.

Quickcalc Quickcalc Quickcalc Quickcalc

It is a desktop application for Linux that runs offline, installs in seconds, and gives you a 30-day free trial with no account to create. A one-time licence replaces the spreadsheet you have been rebuilding for every listing.

The fees most sellers cannot easily track — in one place

Most sellers know their marketplace takes “a fee”. Fewer can say exactly how much they take once every charge is applied. Quick Calc models the fee types that matter: the final-value or commission percentage each marketplace takes on a sale; regulatory fees such as eBay’s compliance charge; VAT on fees, handled correctly with a simplified view for home sellers; fixed order and per-item fees — the flat charges added per order or per item; enforced ad fees, the fixed advertising percentage you cannot opt out of on platforms like Etsy; charity donations and top-rated or seller discounts; low-order threshold penalties charged when an order falls below a set value; category fees for higher-rate categories like electronics or watches; and foreign-sale fees for orders shipped internationally.

That is 15 fee types modelled in one place, per marketplace.

Ten marketplaces built in

Quick Calc loads default fee values for each marketplace — eBay, Etsy, Shopify, Facebook Marketplace and more — so you start from a realistic baseline rather than a blank form. You can edit those defaults to match your actual account, because the rates your account sees are not always the rates the help page quotes.

The numbers that decide whether to list

Press Calculate and Quick Calc rolls every cost into the numbers that matter: your net sale, total costs, profit, margin, and the exact break-even price — the price at which the item stops losing money. The break-even price is the single most useful number a seller can have before listing. It tells you the floor below which you should not sell, before you have committed to a listing that loses money.

Alongside the main calculator, focused mini-tools answer the what-if questions sellers face every day: a VAT tool to add or remove VAT on any figure; a margin calculator to work from a cost and desired markup to a sale price and margin; a discount calculator to see instantly what 5%, 10% or 20% off does to a price; and a free shipping calculator to decide whether free postage still leaves a profit.

Why a spreadsheet is not the answer

A spreadsheet rebuilt for every listing misses fee logic that changes between marketplaces, gets VAT on fees wrong more often than not, does not compute break-even automatically, stays static and out of date when marketplaces change their rates, and offers no built-in tools for the what-if questions. Quick Calc keeps the logic in one place, handles VAT on fees correctly, computes break-even automatically, notifies you of updates, and includes live help and built-in tools for recovery.

Quick Calc Marketplaces for Linux is a product of CritchCorp Computers Ltd. The free 30-day trial is fully functional — continued use after the trial requires a licence. Fee and profit figures are estimates based on the values you enter and the rates available at the time; marketplaces change their fees, and actual results vary. Always confirm final charges with your marketplace.

Pc Audit Pc Audit Pc Audit Pc Audit Pc Audit

PC Audit does that from a USB stick, in around 10 seconds, on Windows or Linux, with no installation on the machine being audited and nothing left behind when the stick is removed.

Reading the report — what matters for a repair shop

The processor line tells you the model, the number of physical and logical cores, the clock speed and the current load. That is the headline spec — the number the customer usually wants to know, and the number you need before you quote a processor upgrade or explain why a machine is slow.

The memory section is where PC Audit earns its keep for a repair shop. It lists total, used and available memory, and then gives you a per-slot table — slot number, manufacturer, DDR type, speed, capacity and part number for each stick. That is the information you need to quote a RAM upgrade precisely. You can tell a customer exactly which stick to buy, in what capacity, without guessing or opening the case to read labels off existing modules.

The storage section lists physical drives — model, serial, interface and size — and logical partitions with drive letter, type, size and free space. That catches failing drives before they fail completely, and gives you the serial number you need for warranty claims. The partition layout tells you whether a machine is running out of space on the system partition, which is often the real reason a customer thinks their computer is slow.

The software list shows what is installed, with versions. That is useful for spotting outdated or unwanted software during a clean-up, and for recording what is on a machine for asset or compliance purposes.

The system log section flags recent errors worth investigating. Not every log entry is a problem, but the ones PC Audit highlights are the ones that suggest a drive that is starting to fail, a service that is not starting, or a hardware event worth looking at before it becomes a return.

Quoting upgrades with certainty

The per-slot memory detail is the single most useful section for a repair shop that quotes upgrades. Instead of telling a customer “you need more RAM” and leaving them to figure out what kind, you can say “your machine has two DDR4 slots running at 2666MHz, one stick of 8GB in slot 1 and one empty slot, so a single 8GB or 16GB DDR4-2666 stick in slot 2 will double your memory.” That is a quote the customer can act on, and a quote you can stand behind.

Sending the report

The report is a PDF. You can save it and attach it in your usual email program, or use the built-in SMTP option to send it automatically — enter your server details once, confirm them with the Test button, and the PDF is attached and sent from the app. Either way, the customer or site contact gets a clean document they can print, file, or forward.

PC Audit is a product of CritchCorp Computers Ltd. One USB licence covers Windows and Linux. The report is a single A4 PDF per machine. Nothing is installed on the machine you audit.

Pc Audit Pc Audit Pc Audit Pc Audit Pc Audit

It is built for repair shops, onsite engineers, and corporate IT teams who need a reliable spec report on a machine they are looking at — without installing anything on that machine and without leaving anything behind.

What the report contains

A PCAudit report is a single A4 PDF that lists everything worth knowing about a machine in one place. The processor — model, physical and logical cores, clock speed and load. Memory — total, used and available, plus a per-slot table showing slot, manufacturer, DDR type, speed, capacity and part number, so you can quote an upgrade precisely. The motherboard and BIOS — make, model, revision, BIOS vendor, version and date. Graphics — GPU name, VRAM and driver version. Storage and partitions — physical drives with model, serial, interface and size, and logical partitions with letter, type, size and free space. Installed software with versions. And recent entries from the system log, flagged where they suggest a problem worth investigating.

That is a complete picture of a machine, in one printable PDF.

How it works

PC Audit runs entirely from the USB stick. Plug it in and run the matching launcher — Run-Windows.bat on Windows, or ./Run-Linux.sh on Linux. A bundled Python runtime is included, so it works even on a machine with no Python installed. Nothing is installed on the PC you audit, and nothing is left behind when you pull the stick out.

The report can be saved as a PDF and opened in your usual email program to attach, or sent directly through the built-in SMTP option — enter your server details once, use the Test button to confirm they work, and the PDF is attached and sent automatically.

Who it is for

Repair shops and service desks keep it on the bench and put a printed spec report in the customer’s hand with the repair note. Specs, serials and BIOS details to hand. Quote RAM and SSD upgrades with certainty. Catch failing drives and errors from the system log. On-site and field engineers arrive with one USB stick and leave with a full report — nothing installed on the customer’s machine, nothing left behind. The same drive runs on Windows or Linux. The PDF can be handed over on site or emailed before you leave. Corporate IT and MSPs audit workstation after workstation on one licence, building a hardware, software and firmware picture across the estate — serials, specs and installed software for asset records, each report printed, filed, or attached to a ticket.

One licence, two platforms

PC Audit is a product of CritchCorp Computers Ltd. One USB licence covers the same stick on a Windows PC and a Linux PC. The report is a clean A4 PDF you can save, print, or email. Nothing is installed on the machine you audit. The licence is a one-time purchase and includes any updates to your version of the software.

Pdf Pilot Pdf Pilot Pdf Pilot Pdf Pilot Pdf Pilot

PDF Pilot is built around exactly that set of jobs. Four tools in one window — merge, split, rotate, compress — each doing one thing well, with no account to create, no data uploaded anywhere, and a one-time licence instead of a recurring fee.

The everyday PDF jobs, listed

Merge combines several PDFs into one document in the order you choose. That is the job that comes up when you have a contract in one file, an invoice in another, and you need to send them together. Split breaks a large document into single pages or extracts only the pages you specify — useful when you have a 50-page PDF and only need three of those pages. Rotate turns every page 90, 180 or 270 degrees, which is exactly what you need after a scan comes out sideways. Compress shrinks a PDF and shows you immediately how much smaller it got, so you can decide whether it will fit in an email before you try to send it.

That covers the bulk of everyday PDF work for most people. If your need is those four jobs, PDF Pilot does them in one place.

Why offline matters for small offices

A small office or home user often handles documents that are not public — contracts, quotes, customer details, financial records. An online PDF converter takes the file you upload and processes it on someone else’s server. You cannot see where it goes, and you cannot un-upload it. PDF Pilot does every job on your own machine, with no internet connection required and no third-party server involved. That is not a luxury for sensitive documents — it is a reasonable default for any document you would rather not hand to a server you do not control.

One licence, no subscription

Adobe and similar subscription services charge monthly and keep charging monthly. PDF Pilot is a one-time purchase. There is no recurring fee, no account to maintain, and no forced upgrade cycle. Updates are offered automatically — you install them or ignore them. You can purchase the Windows version or the Linux version.

The free 30-day trial is fully functional. There is no feature gating, no watermark, and no account to create before you download. Run a real PDF through the trial and see whether the four jobs it does are the ones you actually need.

What PDF Pilot is not

PDF Pilot is not a full PDF editor. It does not let you rewrite text inside a PDF, add annotations, or fill forms. It does the four jobs it does — merge, split, rotate, compress — and does them well, offline, in one window. If your need is those four jobs, that is the tool. If you need to edit the contents of a PDF, that is a different tool for a different job.

PDF Pilot is a product of CritchCorp Computers Ltd. It runs on Windows or Linux. The 30-day free trial is fully functional — continued use after the trial requires a licence. Licence is purchased per OS and per user.

Pdf Pilot Pdf Pilot Pdf Pilot Pdf Pilot Pdf Pilot

PDF Pilot for Windows does the four jobs people actually use, in one clean window, on your own computer. It is a single self-contained file that installs in seconds, adds itself to your Start Menu, and runs from there. A 30-day free trial gives you the full feature set with no account to create and nothing uploaded anywhere.

The four jobs, in one place

Merge combines several PDFs into one, in the order you choose. Split breaks a large document into single pages, or extracts only the pages you specify — “1,3,5-8” — into a new file. Rotate turns every page 90, 180 or 270 degrees, which is what you need when a scan comes out the wrong way. Compress shrinks a PDF and shows you immediately how much smaller the result is, so you can decide whether it will fit in an email before you send it.

That is the whole set. There is no fifth tool to learn, no ribbon of options you have to scroll through. Pick a tab, choose your file, press the button.

Offline, private, one-time purchase

The files you work with in PDF Pilot never leave your computer. There is no upload step, no server processing your document, and no account that needs an email address or a password. Everything runs locally. For personal documents, contracts, financial records, or anything you would rather not hand to a third party, that is the point.

A PDF Pilot licence is a one-time purchase. There is no monthly subscription, no recurring fee, and no forced upgrade cycle. Updates are offered automatically — you install them or ignore them. This is the Windows version but there is also a Linux version, buy a licence from the shop.

How it compares to the alternatives

An online PDF converter takes your file, uploads it to someone else’s server, and processes it there. That works for a one-off job with a non-sensitive document, but it is not a workflow you want for regular use — especially with documents you would rather keep private. PDF Pilot does every job on your own machine, with no internet connection required.

An Adobe subscription costs monthly and typically bundles a lot more than the four PDF jobs most people actually use. PDF Pilot does those four jobs in one window, for a one-time licence. If your need is merge, split, rotate and compress — which is what the vast majority of everyday PDF work is — this is the tool.

Who it is for

• Office workers who merge and split PDFs regularly and do not want to upload sensitive documents to an online converter
• Small teams and home offices that need a simple, reliable PDF toolkit without a monthly fee
• Anyone who receives scans that need straightening before they are useful
• People who email PDFs and need to shrink them to fit attachment limits

PDF Pilot for Windows is a product of CritchCorp Computers Ltd. The free 30-day trial is fully functional — continued use after the trial requires a licence. File sizes and compression results vary by document. The licence covers the Linux version or Windows if you need both platforms you need to purchase a licence for each.

Pdf Pilot Pdf Pilot Pdf Pilot Pdf Pilot Pdf Pilot

PDF Pilot does all four of those jobs in one clean window, on your own machine, with nothing uploaded anywhere. It is built for Linux as a self-contained file that installs in seconds and leaves no trace behind. A 30-day free trial gives you the full feature set with no account to create and no data collection of any kind.

Four tools, one window, zero cloud

Most people who need to work with PDFs regularly end up juggling a few different tools — an online merge site for one-off jobs, a separate compressor, something for rotation. PDF Pilot puts them all in a single window with a tab for each job. Pick a tab, choose your file, press the button. That is the whole interaction.

The merge tool combines several PDFs into one, in whatever order you choose. The split tool breaks a large document into single-page PDFs, or extracts only the pages you specify — “1,3,5-8” is the kind of expression it understands. Rotate turns every page 90, 180 or 270 degrees, which is exactly what you need after a scan comes out the wrong way. Compress shrinks a PDF and shows you immediately how much smaller the result is, so you can decide whether it is small enough to email before you send it.

Everything stays on your machine

The difference between PDF Pilot and an online uploader is not just convenience — it is where your documents go. An online converter takes the file you upload and processes it on someone else’s server. With PDF Pilot, the file never leaves your computer. For personal documents, contracts, or anything you would rather not hand to a third party, that distinction matters.

The same applies to an Adobe subscription. You pay once for a PDF Pilot licence, and the software keeps working. There is no monthly fee, no forced upgrade cycle, and no account that needs managing. Updates are offered automatically — you install them or ignore them, your choice.

Linux support built in

PDF Pilot for Linux is a native build, not a compatibility layer or a web wrapper. It installs into your applications menu like any other desktop program and runs from there. There is also a Windows version if you ever need to work across both platforms — purchase a licence from the store.

The free 30-day trial is fully functional. There is no feature gating, no watermark, and no account to create before you download. Run a real PDF through it — merge two documents, compress a file that is too large to email, straighten a scan — and compare the result with whatever you were doing before.

What PDF Pilot is good for

• Combining several PDFs into one document before sending it to a colleague or client
• Breaking a large PDF into single pages or extracting the specific pages you need
• Straightening scans that came out rotated after scanning
• Shrinking PDFs so they fit email attachment limits or upload faster
• Working with PDFs offline, with no internet connection and no third-party server involved
• Anyone who wants the everyday PDF jobs done in one place without paying monthly

PDF Pilot is a product of CritchCorp Computers Ltd. The Linux version runs on 64-bit Linux distributions. You can purchase a Windows version from the store if you need both platforms. The 30-day trial is fully functional — continued use after the trial requires a licence.