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Omri
A mobile app that ships with no backend, no account, and no data collection.
Omri is a Gregorian and Hijri age calculator that runs fully offline. There is no server to operate, no account to create, and no personal data collected — monetised with ads and a Pro tier that removes them.
The problem
Hijri and Gregorian date arithmetic is genuinely fiddly, and the utility apps that solve it routinely demand an account, network access, and a permissions list out of all proportion to what they do. A calculator does not need a server, and it certainly does not need your identity.
How we built it
No backend at all
The entire calculation runs on-device. That removes the server, the database, the deploy pipeline, and the on-call rotation from a product that never needed them — and it is why the app works with no connection at all.
No account, no collection
There is no sign-up because there is nothing to sync. The app collects no personal data, which makes the privacy policy short and honest rather than a legal shield over a data pipeline.
Monetised without surveillance
Ads fund the free tier and Pro removes them. Because there is no user profile to target against, monetisation stays contextual — the app has nothing to sell about the person using it.
Decisions worth defending
- Offline-first as the whole architecture
- Offline-first is usually a sync strategy layered over a backend. Here it is the architecture: no network calls in the core path means no loading states, no error states, and no outage that can affect a user.
- Ship narrow
- Doing one thing correctly — including the Hijri edge cases that most calendar libraries get subtly wrong — was chosen over a broader feature set that would have needed accounts and sync.
What shipped
- Shipped and live on mobile, running fully offline
- Zero backend infrastructure and therefore zero operating cost per user
- Ad-supported free tier with a Pro upgrade that removes ads
The service behind this
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- Founded · Cairo
- 2022
- Products built
- 2
- End to end
- Senior
- Scope → estimate
- 1wk