A dive log on the watch you already own.
DiveOne records your dive on Apple Watch Ultra and turns it into a logbook entry you can read like an instrument. No extra hardware to buy, no separate device to charge.
How logging works
Three steps, and none of them depend on having a signal at sea.
Dive
The watch records depth at 1 Hz, dive time, and water temperature using Apple Watch Ultra's built-in sensors. Everything is recorded offline — no connection needed underwater or on the boat.
Surface
After surfacing, the dive syncs to your iPhone. Sync status stays visible — the app says so when something needs attention instead of failing silently.
Review
Each dive becomes a journal entry: depth profile, duration, water temperature, and the entry-point location when available.
What gets recorded
Honest limits
A logbook you trust starts with limits you can see.
Supports Apple Watch Series 10 and later and every Apple Watch Ultra model, including Ultra 3.
Apple Watch Ultra hardware has a 40 m sensor range. DiveOne 1.0 native recording is limited to 6 m.
DiveOne is not a dive computer and gives no decompression, ascent, or stop guidance.
Always dive with a primary dive computer and within your training and certification limits.
More for divers
DiveOne is a recreational dive tracking and logbook tool. It is not a dive computer and does not replace professional diving equipment. Always dive within your training and certification limits.
DiveOne 1.0.1 is available.
Download the current App Store release and check the status page for verified limits.