Records dives offline; syncs to iPhone after surfacing.
Track depth, time, and temperature on your wrist. Dive recordings stay on your devices by default, and an account is optional.
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 in one dive
Not marketing. The actual sequence of what happens when you use this tool.
Open DiveOne on your Apple Watch. Select dive mode. Check battery indicator.
No GPS or internet needed. You can pin the dive site on a map later.
No phone nearby. No server connection. No pre-dive configuration for on-device recording.
Glance at your wrist: current depth, dive time, water temperature.
Depth read from the watch sensor, up to 6 m. Water temperature logged when available.
No button presses. No screen interaction. No signal needed.
Surface. Your dive is already saved. Open iPhone app to review depth profile.
Dive log syncs via Bluetooth when phone is in range. HealthKit updated if enabled.
No manual save step for the on-device log.
Check the dive log. Data up to the last checkpoint is kept.
A checkpoint is saved every 5 seconds. The watch keeps the dive until your iPhone receives it.
No internet needed for the watch to keep the dive.
Safety Critical WarningDiveOne is a recreational tracking and logbook tool. It is not a dive computer, does not calculate decompression, and does not replace professional equipment.
Read our full safety statementHow a real dive works with DiveOne
No marketing. Just the actual process, from preparation to recovery.
Prepare and check
Open DiveOne on your Apple Watch. Check battery level. Select your dive mode. The app confirms it is ready. No internet needed.
Battery level, selected mode, ready indicator
Start time and selected mode
Mode setup, no internet, no login
Track depth, time, temperature
DiveOne displays depth and dive time on your wrist. Dive data is recorded on the watch during the dive. No signal is needed underwater.
Current depth, elapsed time, water temperature
Depth profile to 6 m, temperature log, max depth
Recording and logging, with no button presses underwater
Review and export
Surface and your dive is saved. View the depth profile on your iPhone. Export a CSV or create a JSON backup anytime.
Dive summary: max depth, total time, water temperature
Complete dive log saved to Watch local storage
Transfer to iPhone over Bluetooth when in range. No manual upload.
What is kept
Watch battery dies? App crashes? During the session the watch saves a checkpoint every 5 seconds. The dive stays on the watch until your iPhone receives it. Known issues are listed on the status page.
Recording stops; data up to the last checkpoint is kept
Dive samples written continuously during the session, not just at dive end
Checkpoints every 5 seconds; the dive stays on the watch until the iPhone receives it
Three modes. One app.
Track recreational dives across disciplines, with the tools that matter for each.
Scuba
Depth tracking, dive time, and water temperature for recreational scuba diving.
Freedive
Surface interval tracking, dive time, and depth recording for breath-hold training sessions.
Snorkel
Water temperature, session time, and shallow depth for casual snorkel outings.
Built for divers who value clarity
Straightforward tools for tracking and reviewing your dives.
Records Offline
Records dives offline; syncs to iPhone after surfacing.
Depth Tracking
Depth recording from the Apple Watch depth sensor, up to 6 m.
Dive Timer
Live elapsed dive time on your wrist, from descent to surfacing.
Dive Journal
Dive logging: depth profile, duration, temperature, and a dive site you can pin on a map.
Apple Health
Completed Watch dives are saved to Apple Health as underwater workouts.
Privacy-First
Dive recordings stay on device by default. An account is optional. From version 1.0.2, product analytics that is not linked to your account or identity starts only after a first-open disclosure and can be turned off there or later in Settings.
Where your dive data lives
A clear picture of data ownership. No fine print.
Apple Watch
Sensors record depth, temp, time. Data stored on device.
iPhone
Dives move from the watch to iPhone over Bluetooth. Full history and profiles.
Cloud
In 1.0.1, signing in may copy your logbook and attached photos to DiveOne servers. This is off from version 1.0.2. Without signing in, your logbook stays on your iPhone.
OptionalExport
CSV export anytime. Your logbook is yours to export or delete.
What happens to your data when…
You delete the app
The logbook on your iPhone is removed with the app. Restore it from a JSON backup you saved.
Recommended: create a JSON backup before deleting
You switch to a new iPhone
Your logbook does not move by itself. Create a JSON backup on the old iPhone and restore it on the new one.
Recommended: create a JSON backup before switching
You don't use iCloud
On-device dive recording does not require iCloud or an account.
None needed
Apple Watch stops working
Dives already on your iPhone stay there. Dives not yet sent from the watch may be lost.
Recommended: open DiveOne on iPhone after each dive day
Watch battery dies mid-dive
The watch saves a checkpoint every 5 seconds. Data up to the last checkpoint is kept and recovered when DiveOne opens again on the watch.
Start every dive day with at least 80% battery
Your data belongs to you
Dive recordings stay on device by default. An account is optional. Export a CSV summary or a JSON backup anytime.
- Dive logs are kept on device by default
- Export to standard formats (CSV)
- Account optional for on-device app tracking
Can I rely on this?
Three perspectives. No marketing. Just facts.
What you can verify
- Dive recordings stay on device by default. An account is optional
- Records dives offline; the dive moves to iPhone after surfacing
- If a sensor reading is invalid, DiveOne shows it as unavailable instead of guessing
- CSV export and JSON backup, anytime. Your data is not locked in
What instructors should know
- We clearly label DiveOne as a logging tool, not safety equipment
- DiveOne does not replace dive training or certification
- Student dive logs are recorded automatically, with depth only to 6 m
- Known recording issues are listed on the status page
Why it won't get you in trouble
- No decompression calculations. DiveOne does no safety-critical computation
- The 6 m recording limit is stated up front
- Clear statement in the app: DiveOne is not a dive computer
- We'd rather show less data than show wrong data
Technical details
Designed for supported Apple Watch models (Ultra, or Series 10 and later).
Simple, transparent pricing
Core dive recording and logging are free forever. No credit card required.
Free
- All dive modes
- Dive journal and history
- Data export (CSV)
Pro / Plus
- Core stays free forever
- Extended analytics and sync
- Cloud backup and priority support
Common questions
Run a dive center?
We work with dive centers, instructors, and shops. Let's explore how DiveOne can support your divers.
Learn about partnershipsDiveOne vs. Traditional Dive Computer
DiveOne and a dive computer serve different roles. One is safety equipment. The other is a logging companion. Here's the honest breakdown.
Recording Without Signal: What It Means for Divers
DiveOne records dives offline and syncs to iPhone after surfacing. Here is what works without signal during and after a dive.
Which Apple Watch models work with DiveOne
DiveOne works on Apple Watch models with a depth sensor: every Apple Watch Ultra and Series 10 and later. On all of them, DiveOne records depth to 6 m.
DiveOne 1.0.2 is on the App Store.
A shallow dive logger and logbook for supported Apple Watch models. It records depth to 6 m and is not a dive computer.
Download on the App StoreRecording deeper than 6 m needs an Apple entitlement that has not been granted. DiveOne is not offered on the App Store in the European Union.
Experienced diver?
Founding Divers is a small, selective program for experienced divers, not an open beta. The first group has not started yet. Applications are reviewed by hand.
About Founding Divers