A calm, offline-first dive computer for recreational scuba and freediving.
Track depth, time, and temperature on your wrist. Your dive data stays on your device. No cloud dependency, no mandatory accounts. Just a focused tool that works underwater.
Built for Apple Watch Ultra · Scuba · Freedive · Snorkel
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.
How 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 real-time depth and dive time on your wrist. Haptic alerts for safety stops. All data recorded locally — no signal required.
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. Data syncs via Bluetooth — no cloud required.
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? Your dive data is stored locally and recoverable. We designed for failure scenarios, not just happy paths.
Session marked as 'interrupted' — data preserved up to failure point
All data written continuously to persistent storage, 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.
In developmentFreedive
Surface interval tracking, dive time, and depth recording for breath-hold training sessions.
In developmentSnorkel
Water temperature, session duration, and location logging for casual snorkel outings.
In developmentBuilt for divers who value clarity
Straightforward tools for tracking and reviewing your dives.
Offline-First
Works without cellular or WiFi. Your dive data is recorded locally and syncs when you surface.
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
Automatic logging of each dive: depth profile, duration, temperature, and GPS entry point.
HealthKit Integration
Dive data flows into Apple Health so you can track diving alongside other fitness activities.
Privacy-First
Your dive data stays on your device. No mandatory accounts, no cloud dependency, no tracking.
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
No effect. DiveOne never requires iCloud. All data stored locally on Watch and iPhone.
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
Can I rely on this?
Three perspectives. No marketing. Just facts.
Why divers trust DiveOne
- All data stays on your device — we can't see, sell, or lose your dive logs
- Works offline — no signal needed at any point during the dive
- 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.
Read →Offline-First: What It Actually Means for Divers
DiveOne works without internet at every stage — before, during, and after your dive. Here's what offline-first means in practice.
Read →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.
Read →Get early access
DiveOne is in active development. Join the waitlist for early access and updates.
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