Records dives offline; syncs to iPhone after surfacing.
Track depth, time, and temperature on your wrist. Dive recordings stay on device by default; account and web-planner cloud features run only with explicit consent.
DiveOne is a recreational dive tracking tool. It is not a certified 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 Apple Watch Ultra. Select dive mode. Check battery indicator.
GPS entry point is recorded by the watch when available. No internet is required during recording.
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 sampled at 1 Hz via hardware gauge. Temperature logged continuously. Safety stop countdown triggers at 5m ascent.
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 — it was written continuously, not just at the end.
Data persists through crashes. Watch stores independently from phone. Session marked as interrupted if battery died.
No data recovery process. No support ticket. No internet to restore.
Safety Critical WarningDiveOne is a recreational tracking tool — not a certified dive computer. It does not calculate decompression or 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 Ultra. Check battery level. Select your dive mode. The app confirms it's ready — no internet needed.
Battery level, selected mode, ready indicator
GPS coordinates, start timestamp, selected mode
GPS capture, mode initialization — no internet, no login
Track depth, time, temperature
DiveOne displays depth and dive time on your wrist. Dive data is recorded on device during the dive — no signal required underwater.
Current depth, elapsed time, water temperature, safety stop countdown
Depth profile at 1 Hz, temperature log, max depth, ascent rate
All sampling, alerts, and logging — no button presses underwater
Review and export
Surface and your dive is saved. View the full depth profile on your iPhone. Export to CSV anytime. Account and cloud backup features are separate consented flows.
Dive summary: max depth, total time, avg temperature
Complete dive log saved to Watch local storage
Bluetooth sync to iPhone when in range — no manual upload
Your data is protected
Watch battery dies? App crashes? Phone lost? Dive recordings are written during the session and sync to iPhone after surfacing. We designed for failure scenarios, not just happy paths.
Session marked as 'interrupted' — data preserved up to failure point
Dive samples written continuously during the session, not just at dive end
Crash recovery, data persistence, independent Watch storage
Three modes. One app.
Track recreational dives across disciplines — with the tools that matter for each.
Scuba
Depth tracking, dive time, water temperature, and safety stop reminders for recreational scuba diving.
Freedive
Surface interval tracking, dive time, and depth recording for breath-hold training sessions.
Snorkel
Water temperature, session duration, and location logging 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
Continuous depth recording using the Apple Watch Ultra depth gauge hardware.
Safety Stop Reminders
Configurable safety stop timer with haptic and visual alerts on your wrist.
Dive Journal
Dive logging: depth profile, duration, temperature, and entry-point location when available.
HealthKit Integration
Dive data flows into Apple Health so you can track diving alongside other fitness activities.
Privacy-First
Dive recordings stay on device by default. Account, web-planner, and analytics features use cloud services only with explicit consent.
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
Dive logs sync via Bluetooth. Full history and profiles.
Cloud
Only if you enable HealthKit sync. Never mandatory.
OptionalExport
CSV export anytime. Your data leaves when you want it to.
What happens to your data when…
You delete the app
Dive data on Watch is preserved. Reinstall and sync. iPhone data depends on whether Watch companion was also removed.
Recommended: export CSV before deleting
You switch to a new iPhone
Pair Apple Watch with new iPhone. DiveOne data on Watch syncs automatically. Previous CSV exports remain in your files.
Recommended: export CSV before switching
You don't use iCloud
On-device dive recording does not require iCloud. Account and web-planner cloud features are separate consented flows.
None needed
Apple Watch stops working
Data already synced to iPhone is safe. Un-synced data on Watch may be recoverable after Watch service, but not guaranteed.
Recommended: keep iPhone synced regularly
Watch battery dies mid-dive
Data up to battery depletion is saved. Session marked as interrupted. Recoverable when Watch powers on.
Always start dives with 30%+ battery
Your data belongs to you
Dive recordings stay on device by default. Account and web-planner cloud features are separate consented flows. Export your data anytime in standard formats.
- 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.
Why divers trust DiveOne
- Dive recordings stay on device by default; consented account and planner features use DiveOne servers explicitly
- Records dives offline; syncs to iPhone after surfacing
- If a sensor reading is invalid, we show 'unavailable' — never fake data
- Full CSV export, anytime — your data is never locked in
Why instructors recommend it
- We clearly label DiveOne as a logging tool, not safety equipment
- We never claim to replace any part of dive training or certification
- Student dive logs are automatic and consistent — useful for training reviews
- If DiveOne fails during a dive, it says so transparently — no hidden failures
Why it won't get you in trouble
- No decompression calculations — we don't touch safety-critical computations
- No overclaims in marketing — what you read is what you get
- Clear disclaimer on every entry: 'This is not a dive computer'
- We'd rather show less data than show wrong data
Technical details
Designed for the Apple Watch Ultra hardware.
Simple, transparent pricing
Start for free during the beta period. No credit card required.
Free
- All dive modes
- Dive journal and history
- Data export (CSV)
Pro
- Everything in Free
- Advanced dive analytics
- 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.
Why Apple Watch Ultra Only
DiveOne requires Apple Watch Ultra or Ultra 2. Here's the technical reason — not a business choice, a hardware requirement.
Get early access
DiveOne is in active development. Join the waitlist for early access and updates.
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