The multi-tool for your coding journey. Watch your websites and APIs, keep an eye on your repos, and carry the small utilities you always end up needing. Open source, locally first, always free.
What is Anvil?
Anvil is an iOS toolbelt for developers. Point it at the websites and APIs you care about and it checks them on a schedule — status codes, response bodies and response times — then taps you on the shoulder only when something actually looks wrong.
Connect a GitHub token and you also get a dashboard of your profile and repositories. Skip it and everything else still works, because Anvil has no accounts, no backend and nothing to sign up for. The entire app is open source, so you can verify all of that yourself.
The rest is the stuff you reach for between tasks: a colour palette generator with live app previews, a regex builder, and a calculator that speaks bytes and bandwidth instead of just numbers.
Features
001
Add a website or API endpoint as a checkpoint and Anvil watches its status code, body and latency for you.
002
Capture a baseline response and see a unified diff the moment it changes — line by line, header by header.
003
Timestamps, build hashes, rotating cookies — mark the lines and headers that always change so only real regressions get flagged.
004
Run checks every five minutes, once a day, or only when you ask. Anvil keeps checking in the background and stays quiet while everything is healthy.
005
Set how much extra latency is unacceptable and get told when an endpoint is technically up but crawling.
006
Connect a personal access token to browse your profile, repositories and code stats from your phone. Entirely optional.
007
Build light and dark palettes side by side, preview them on real app layouts, and export the whole thing as JSON.
008
Assemble regular expressions from tokens and presets, and convert between bytes, bandwidth and the other units that never stick in your head.
Why Anvil
No hiker leaves without a multi-tool — so why code without one? Anvil is free on the App Store and open source on GitHub.
