Time how long each contraction lasts and how far apart they are, watch the 5-1-1 and 4-1-1 patterns, and see whether things are picking up, all in your browser.
Is my data private? Yes. Contractions are saved only in your browser's local storage, and the app never sends them anywhere, so your data never leaves your device. Export your data to JSON in the settings if you want to save it.
What do 5-1-1 and 4-1-1 mean? Contractions roughly 5 (or 4) minutes apart, each about a minute long, sustained for about an hour. A common guideline for when to head to the hospital (Texas Health), alongside the broader signs of labor described by Cleveland Clinic and Mayo Clinic. Always follow your own provider's instructions.
Do I need to install anything? No. It runs in any modern browser. You can also add it to your home screen for a full-screen icon that works offline — see the steps below.
Installing it gives you a full-screen app icon that opens instantly and works offline.
iPhone or iPad: open this page in Safari, tap the Share button, scroll down and tap Add to Home Screen, then tap Add.
Android: open this page in Chrome, tap the ⋮ menu, then tap Install app or Add to Home screen and confirm.
This app is free and has no ads. If it helped you and you'd like to chip in toward hosting costs, you can leave a tip below. Thank you!
This tool is a timing aid, not medical advice; always follow your provider's instructions on when to call or go in.