An old Roman saying. The idea: readiness is the path to peace. Not aggression — preparation. The work you do before the moment matters.
This isn't about war. It's about the principle: the quiet discipline of knowing where you stand, what you've done, and what comes next. Tracking what matters. Owning your data. Operating with intention.
That's what this is built for.
Every tracking app today wants something from you. Your subscription. Your data. Your attention. Your daily "engagement metrics" so they can sell ads against your eyes.
Parabellum doesn't. No subscription. No account. No data collection. No advertising. The app you build is yours — installed on your device, running locally, owned by you.
If we disappear tomorrow, your app keeps working.
Choose your tools — calories, lifts, sleep, journal, goals, anything from the library. Pick a theme. Get a permanent link. Open it on your phone, add to home screen. Done.
It looks and behaves like a native app. It works offline. It saves everything locally. You can give your custom URL to family or share with friends — each person gets their own data on their own device.
For a full walkthrough, see the Index.
We don't have your data because we don't collect it. There are no accounts. There are no databases. Everything you log in your app — calories, workouts, journal entries, all of it — is stored in your browser's local storage and never transmitted anywhere.
The only exception is MARK, the optional AI assistant. When you message MARK, your message goes directly from your phone to your chosen AI provider (Anthropic, Google, etc.) using your own API key. We don't see those messages.
For full details, see our Privacy Policy.