Sourdough is flour, water, salt and patience. Nothing about it needs an account, a subscription or a server somewhere keeping track of your jar. OpenSourdough is a baking companion built on that idea.
What it does
Most recipes hand you times written for someone else's kitchen, and most failed loaves are a schedule followed too faithfully. The app turns a recipe into a live plan that moves with your dough: it scales fermentation to your dough temperature, re-times the rest of the day when you finish a step early or late, and tells you what each step should look like rather than just how long it takes.
It sizes a formula to the pot you actually own, counts the flour and water inside your levain so the percentages mean what they say, logs your starter until it knows how long yours takes to peak, and keeps a journal so one bake can teach the next.
What “open” means here
- No account. There is nothing to sign up for.
- Your data stays yours. Bakes, feeds and notes are stored in your browser on your own device. There is no OpenSourdough server holding them — which also means clearing your browser's site data clears the journal.
- It works offline. Once loaded, the app runs with no connection at all.
- The knowledge is free to read. The starter guide, schedules and troubleshooting are all here on the site, no app required.
How it stays free
This website shows a small number of clearly labelled ads, which pay for hosting and the time it takes to keep improving it. The app itself has no ads: nothing should get between you and a timer with your hands covered in dough. The privacy page explains exactly what the ads can and cannot see.
An honest note on the pictures
The photography on this site is generated with AI and is illustrative. The recipes, timings and guidance are not — they are the same tested formulas the app runs on.