Free tools for people who build with AI
Small, free web tools I build alongside the apps. Check what your AI coding agent claims, practice spotting its tricks, and clear your head when it gets busy. No login, no charge, no nagging.
4 tools live, more on the way. Part of the 10-product challenge.
Four tools live, more on the way
Each one does a single job well. Free, in your browser, with no account to create.
Agent Receipt
Check your AI coding agent’s “done”
Paste what the agent said, your own test run and the diff. Every claim gets a label: Proof shown, Contradicted, No proof or Can’t tell.
- Reads Jest, Vitest, pytest, go test, XCTest and git diff
- Catches skipped tests, fake test commands and hidden errors
- Never sends what you paste, and works with Wi-Fi off
Diffective
Spot the bug in an AI agent’s report
A free debugging game. The AI coding agent says it’s done, but one claim has no proof. Find it, tap the line that proves it and name the trick.
- Short cases, about 60 seconds each
- A training case walks you through the first one
- New cases every day, plus a shared Daily Case
Pluck
Your menu of good-for-you things
Build a dopamine, self-care, or coping menu in two minutes, then pick from it instead of doomscrolling when your brain is stuck.
- Three menu types: dopamine, self-care, and coping
- Save it to your phone and come back anytime
- Sorted by effort, so there is always a fit
Brain Dump
Empty your head, fast
A calm, no-login place to dump every thought the moment it gets loud, then sort it later, or not. Made for the 2am racing-thoughts moment.
- Get everything out of your head in seconds
- No account, no setup, no friction
- Sort it later when you are ready, or let it go
Calm by design, not by accident
I build these the way I wish more software worked. Quiet, fast, and on your side.
No login, ever
No account, no email wall, no sign-up before you can use the thing. Open it and go.
Works anywhere
Runs right in your browser on any device. Save it to your home screen and it feels like an app.
One job, done fast
No guilt, no streaks, no nagging. Each tool does one thing well, so you get your answer and get back to building.
Part of the 10-product challenge
These free tools count toward shipping 10 polished products in the open, alongside the iOS apps.
See the challenge →The thinking behind the tools
I write about why these tools work, and how to actually use them, on the build-in-public blog.