Nap timer · Apple Watch
Koima is a nap timer for Apple Watch. Pick ten, twenty, thirty or sixty minutes. It wakes you at the time you set — and if you start stirring in the last few minutes, it wakes you then instead. Earlier, never later.
Whether the wake reaches you depends on your notification permission, your Focus settings and the state of your watch. The support page sets out the limits plainly.
Why Koima
Near the end of the nap Koima watches wrist motion. If you start moving, it wakes you then. If you don't, it wakes you at the time you chose — the smart wake can bring your alarm forward, never push it back.
With your permission Koima reads heart rate from Apple Health during the nap, and afterwards shows your duration, average heart rate and roughly how long you took to settle.
Start, adjust and stop a nap from your wrist. The watch app runs independently — your iPhone does not need to be nearby or awake for a normal nap.
No account, no ads, no analytics SDKs, no tracking. Your health data stays on your device and in Apple Health. There are no servers, because we do not have any.
01 · Smart wake
Choose 10, 20, 30 or 60 minutes. Koima counts down on your wrist with a ring that shows the time left and the time you will wake. In the final minutes it watches for the wrist movement that comes with surfacing, and wakes you then — so the alarm arrives while you are already coming up, rather than at a fixed second regardless. If you stay still through that window, Koima wakes you at the time you picked.
How much that is worth depends on the nap. Most people never reach deep sleep in a ten- or twenty-minute nap — much of a short nap is spent falling asleep at all — so waking on your first stir is a gentler finish rather than a rescue. On a thirty- or sixty-minute nap there is more real sleep to time against, and more room for the timing to matter. We would rather say that than imply every length is the same.
You can add or subtract five minutes mid-nap, or stop at any point.
02 · Apple Health
If you allow it, Koima reads heart rate from Apple Health while you nap, so it can show your average and a small live reading on the countdown. When a nap finishes, Koima writes a single sleep sample to Apple Health so the rest shows up alongside your night's sleep.
That health data stays on your device and in Apple Health. It is never used for advertising or marketing, never mined, and never shared with anyone. Koima works without Health access too — you just lose the heart-rate readout and the Health record.
03 · Backup alarm
If you usually nap with your iPhone nearby, you can turn on an iPhone backup alarm. Koima then schedules an alarm on your own paired iPhone for shortly after your wake time, and cancels it when you wake and dismiss the nap on the watch.
It is optional, off unless you choose it, and it needs your iPhone paired and in range. Only the alarm's identifier and its fire time travel to your phone — nothing leaves your devices.
Pricing
$0
Every feature: smart wake, heart rate, the nap summary, the iPhone backup alarm. Limited to three nap starts in any seven days.
$1.99 / year
The same app with the start limit removed. One subscription, billed yearly, cancel whenever you like.
Privacy first
Koima has no sign-in, no analytics SDK and no third-party trackers. Your naps and settings live on your devices. There is nowhere for your data to go, because there is no server behind the app.
Health disclosure: Koima reads heart rate from Apple Health during a nap and writes one sleep sample to Apple Health when a nap completes, both only with your permission. That health data is never used for advertising or marketing, never used for data mining, and never shared with third parties.
Read the full privacy policySupport
For the last few minutes before your chosen time, Koima watches wrist motion. Sustained movement reads as you starting to surface, and it wakes you then. If you stay still, it wakes you at the time you picked — the smart wake can only move your alarm earlier, never later.
Worth being straight about what that buys you: Koima does not detect sleep stages and is not a sleep tracker. On a short nap most people never reach deep sleep, so waking on your first stir is a gentler finish, not a rescue from grogginess. On longer naps there is more sleep to time against.
Not always. Koima asks the system for time-sensitive delivery, which can reach you through some Focus modes, but a Focus that denies time-sensitive alerts — or a notification permission that is switched off — can suppress the alarm. Check Settings › Notifications › Koima on your watch, and read the support page before relying on it for anything that matters.
Not for a normal nap — the watch app runs on its own. The optional iPhone backup alarm does need your paired iPhone in range.
It reads heart rate from Apple Health during the nap and writes a sleep sample when the nap completes. Both need your permission, both stay on your device and in Apple Health, and neither is shared, sold or used for advertising.
Yes. You lose the heart-rate readout and the sleep record; the timer and the smart wake work the same.
The free tier is the complete app, limited to three nap starts in any seven days. A start counts as soon as a nap begins, even if you stop it early. Koima Unlimited removes the limit for $1.99 a year — see pricing.
Still stuck? Email support@gamov.io — see the full support page.