Anvil Workout runs entirely on your iPhone. No account to create, no cloud to sync to, no internet connection required. Your programs, your workout history, and your personal records all stay on the device — and your Wi-Fi in the gym basement no longer matters.
A lot of fitness apps call themselves "offline-capable" but still need an internet connection to sign in, validate subscriptions, or back up data. Anvil Workout takes a stricter stance:
The squat rack is usually in the back corner of the basement of the building, and that's exactly where cell service dies. An app that needs to phone home between sets is an app that freezes mid-workout. Anvil Workout doesn't care — your workout runs the same whether you're in airplane mode or on 5G.
Hotel gyms, garage gyms, outdoor calisthenics, a cabin in the woods with no Wi-Fi. If you can open the app, you can train. Everything syncs back to Apple Health the next time you're near a Mac or on a flaky connection — and that's it.
Your workout history is personal data. It reveals your schedule, your physical capacity, and patterns that can be combined with other leaks to identify you. We chose not to collect it at all, because the safest data is the data that never leaves your device.
When a cloud fitness app shuts down or pivots — and many do — your data usually goes with it. On Anvil Workout, your data lives in your iPhone's local storage and is included in your normal iCloud device backup. It's as durable as anything else on your phone.
Anvil Workout is a native SwiftUI + SwiftData app. SwiftData is Apple's on-device persistence framework — think of it as a private, local database optimized for Apple hardware. Your programs, session history, and exercise library all live in SwiftData on your device.
There is no backend service because there's nothing for a backend to do. Your iPhone is the server, the client, and the database — all at once.
Most popular fitness apps sit somewhere on the spectrum below. We're on the left end by design.
Offline isn't strictly better — it's a tradeoff. If you want a social feed, a leaderboard, or one-tap sync between your iPhone and iPad, a cloud-based app is the right choice. If you want a focused lifting app that never asks you to sign in, never disappears, and never sells your data, Anvil Workout is built for you.
Offline doesn't mean minimalist. Anvil Workout ships with:
One-time purchase. Works fully offline. No subscription, no account, no ads, no in-app analytics.
Download Anvil Workout