Free tools

Small tools.
No signup.

Calculators I built for problems I kept hitting. They run entirely in your browser, keep nothing, and ask for no account.

Trip expenses

Trip expense split calculator

Add who paid for what and see exactly who owes whom — plus a summary you can paste into the group chat.

Open the calculator ↗

Why these are free

Most of them exist because I needed them once and the alternatives wanted an account, a subscription, or my email before showing a number. These do the calculation and get out of the way.

If one saves you time, tell me what you used it for — it is the best signal for what to build next.