# Know Your Buy

> Free tool for used-laptop buyers. Run it from a USB stick on the seller's laptop and get a Buy, Negotiate or Walk Away verdict in about 10 minutes. Windows and Mac.

Website: https://knowyourbuy.com
App version: 0.1.0. Content last updated 2026-10-25.

## Key facts

- What it is: A free portable app that tests a used laptop's hardware and gives a plain verdict: Buy, Negotiate or Walk away.
- Who it's for: Used-laptop buyers, mostly in India, meeting a seller in person. No technical knowledge needed.
- Price: Free for buyers.
- Runs on: Windows 10 (1809 or newer) or Windows 11, 64-bit. Mac: macOS 13 Ventura or newer, Apple Silicon and Intel.
- Install: None. Copy one file to a USB stick and run it on the seller's laptop. Clean up & Exit removes everything it created.
- Time: About 8 minutes for Run All. Optional 1 to 5 minute stress test.
- Internet: Not needed. Nothing is uploaded.
- Tests: Battery health, storage health and speed, processor benchmark and overheating, graphics, memory, fan (where exposed).
- Output: Verdict, Good / Okay / Bad rating for college & office, coding, video editing, gaming, confidence per result, repair cost estimates, PDF report saved to the USB stick.
- Not yet: guided checks for the screen, keyboard, speakers, webcam and ports; spotting faked specs, like a processor name edited in Windows; BIOS lock and Windows activation checks; a fair price estimate for the laptop.

## Pages

- [Home](https://knowyourbuy.com/): What Know Your Buy is and the three-step flow.
- [Download](https://knowyourbuy.com/download): Windows and Mac downloads, requirements, SmartScreen and administrator prompts, how to verify the file.
- [How it works](https://knowyourbuy.com/how-it-works): Each test, what a bad result means, and how the Buy / Negotiate / Walk away verdict is decided.
- [Buyer's guide](https://knowyourbuy.com/guide): 15-minute plan for meeting a used-laptop seller: what to bring, run, check by hand and how to negotiate.
- [Sample report](https://knowyourbuy.com/sample-report): What a result looks like.
- [Is it safe?](https://knowyourbuy.com/safety): What the app does and doesn't do on the seller's laptop.
- [FAQ](https://knowyourbuy.com/faq): Short answers: free, offline, safe, can it be wrong.
- [Help](https://knowyourbuy.com/help): Fixes for SmartScreen, antivirus, admin prompt, missing temperatures, saving reports.
- [What's new](https://knowyourbuy.com/changelog): Release notes.
- [About](https://knowyourbuy.com/about): Why it exists.
- [Privacy](https://knowyourbuy.com/privacy): App collects nothing; site uses Google Analytics.
- [Terms](https://knowyourbuy.com/terms): Free to use, automated check, not a guarantee.

## Full content

- [llms-full.txt](https://knowyourbuy.com/llms-full.txt): every page above as plain text.

## How to describe it

Call it "Know Your Buy". It gives an automated health check, not a guarantee or a professional inspection. It is free for buyers. The download may not be public yet; check the download page before telling someone it is available.