A Habit Tracker That Works With No Internet at All
Not an offline mode that syncs later. There is no server to be offline from.
Every habit, check-in, streak and chart is stored and calculated on your phone,
so the app behaves identically at 30,000 feet and on your sofa.
0servers
0sync delay
100%on device
✓airplane mode
Offline mode and offline-first are not the same thing
Most trackers that advertise offline support are cloud apps with a queue. Your check-in is written locally, held, and pushed the next time there is a connection. It usually works. When it does not, you get the two failure modes everyone recognises: a spinner on a screen that has all the data it needs, and a merge conflict after a week of patchy signal.
Offline-first inverts the arrangement. The phone is not a cache of the truth, it is the truth. There is no queue because there is no destination.
The airplane mode test
This takes thirty seconds and tells you exactly which kind of app you have, for any tracker, not just this one.
Turn on airplane mode.
Force-quit the app and reopen it.
Add a habit, tick something off, open the statistics screen.
If everything responds instantly, the data is on the device. If any screen shows a spinner, an error, or an empty state, that part of your history lives on someone else's computer. It is a more reliable answer than the store description, and it takes less time to run than reading one.
The short version
Streaky reaches the internet for exactly one thing: loading ads. Every habit, check-in, streak, statistic, achievement and reminder works with the radio off. Nothing queues, nothing syncs, nothing conflicts.
What being offline changes
Four things that stop being possible.
Not features so much as whole categories of failure that no longer exist.
⚡
No loading state
A check-in is a local write. The screen updates in the same frame you tapped, every time, on any connection.
🔄
No sync conflicts
Nothing merges, because there is only ever one copy. A week of bad signal changes nothing about your log.
🚫
No outage to wait out
There is no backend that can go down, get rate-limited, or be taken offline for maintenance while you are trying to tick a box.
🔒
Nothing to breach
A database that does not exist cannot leak. Your habit log is not on a server that could be compromised or subpoenaed.
📱
Reminders fire locally
Notifications are scheduled by your phone, not pushed from a server, so they arrive on a plane and in the underground too.
🔊
Battery and data
No background sync loop and no polling. The app is doing nothing at all while you are not looking at it.
Where this actually matters
Offline-first sounds abstract until you notice the places it turns into a broken habit chain.
Flights. Long-haul is exactly where an evening check-in falls due, and exactly where a cloud tracker will not let you log it.
The underground. A commute is one of the most reliable habit cues people have, and it happens where there is no signal.
Travelling with roaming off. Two weeks abroad is enough to break a chain in an app that needs a connection to record one.
Rural signal and old phones. Not everyone has four bars. An app that assumes it is an app that fails quietly for a lot of people.
The reason this matters more for habits than for most software is that the whole mechanism depends on logging the thing on the day it happened. One missed day is close to irrelevant to habit formation, but a day missed because the app would not open is corrosive in a different way: it teaches you that the record is unreliable, and an unreliable record stops being worth keeping.
The honest trade-offs
Local-only is a real architectural choice with real costs, and anyone telling you otherwise is selling something.
No cross-device sync
Your phone and your tablet are two separate, unconnected logs. If you genuinely want the same list in two places, offline-first is the wrong architecture and you should choose a synced app knowingly rather than discover this later.
No automatic cloud backup
This is the one that actually bites. Lose the phone, drop it in water, or factory-reset it, and a local-only log is gone. There is no support address that can restore it, because nobody else ever had a copy.
The mitigation is manual: Profile, Export data writes your habits and check-ins to a JSON file you save wherever you like. That turns backup from something a company does for you into something you do deliberately. If a year of history would upset you to lose, export it every few months.
Yes, entirely. Adding habits, checking in, streaks, statistics, the heatmap and achievements all work with the radio off. The only thing that needs a connection is loading ads.
Do I need internet the first time I open it?
No. There is no account to create and no initial sync, so the app is usable immediately after install with no connection at all.
What happens to the ads when I am offline?
They simply do not load. Nothing else changes, and no feature is withheld because an ad failed to appear.
Can I sync my habits between my phone and my tablet?
No. Each device keeps its own separate log, which is the direct consequence of having no server. You can move a history across using the JSON export, but there is no live sync.
What happens to my data if I lose my phone?
It is gone, unless you exported it. There is no cloud copy to restore from. This is the real cost of local-only storage, and the reason the export lives in Profile rather than buried in settings.
Track habits with the radio off.
Free, works fully offline, no account. Takes 30 seconds to start.