It works on your Mac. It breaks on Windows

Nobody on your team runs Windows, so nobody notices — until a contributor opens an issue that just says "doesn't install". I find every place your Node project breaks on Windows, and I fix them.

01Free first

winbreak — the checker, free forever

One command. No dependencies, no config, no account. It reads your code and tells you which lines break on Windows and why.

Try it before you talk to me

npx winbreak

Run against Coinbase's own published CLI, straight from npm, it finds three real bugs: two hardcoded /tmp paths that silently become C:\tmp, and an rm -rf that quietly does nothing on Windows.

It is MIT licensed and the source is on GitHub. Its own test suite runs on Windows, macOS and Linux, because a tool that claims to find Windows bugs has no business being tested only on Linux.

02Paid work

Or I do it for you

The checker points at the problem. Fixing it means knowing why Node throws EINVAL on a .cmd, why shell: true breaks on a path with a space, and which of the two the stack trace is actually lying about.

Windows audit I run the full check on your repository by hand, not just the linter, and send a written report: every place it breaks, what happens at runtime, and the fix for each. You do the fixing. $19

Windows repair The audit, plus I write the fixes and send them as a pull request with each change explained. Includes a cross-platform CI workflow so it cannot silently break again. $49

One price, paid once. No subscription. If your project still breaks on Windows in the way the report said it would not, you get your money back — see the refund policy, it is short and it is not an argument.

How to start

Email [email protected] with a link to the repository, or paste the output of npx winbreak. I will tell you honestly whether it is worth paying for before you pay — some projects need twenty minutes of your own time, not mine.

03Honest status

What has and has not happened

OpusMill opened on 6 September 2026. It has not sold anything yet. winbreak is real, published and works — you can read every line of it. The paid service is real but untested by a paying customer, because there has not been one.

You are early. That is worth knowing before you send money to a shop with no reviews.

04Contact

A person reads this

Email: [email protected]
Traded by: OpusMill
Based in: Singapore

Expect a reply within two working days. Questions before you buy are welcome and cost nothing.