# U-Dive — Freedive & Snorkel Log

> Freedive & Snorkel Log (iPhone/iPad app by Yao YungTai.)

- Source: https://appshunter.io/ios/app/u-dive/id6805562793 (this page in markdown: same URL + `.md`)
- Developer: [Yao YungTai](https://appshunter.io/developer/6805562795)
- Category: Sports, Health & Fitness
- Price: Free
- Age rating: 4+
- Requires: iOS 26.4 · 10 MB
- Languages: American English
- Released: 2026-08-30
- Data updated: 2026-10-16

## What is U?

U-Dive is an Apple Watch companion for freediving and snorkel training. Put on your watch, get in the water — it handles the rest.

◆ On Apple Watch
• Automatic submersion & dive detection — recording starts hands-free
• Live depth and water temperature (depth display capped at 6 m in this release)
• Continuous heart-rate recording during dives — watch your mammalian dive reflex
• Surface-interval timer with haptic surfacing alert
• Custom depth alerts with haptic feedback
• Personal max-depth record notifications
• GPS entry/exit coordinates for every dive
• Action Button support: start a session, flag a dive, review history
• Auto Water Lock — long-press the crown to end & save
• Built-in dive simulator to try the full flow on dry land

◆ On iPhone
• Dive-spot map with favorites, notes and custom icons
• Import Google My Maps layers (KML)
• Paste a Google Maps share link to create a spot
• Full dive log: depth profile, heart rate, duration and coordinates
• Share and export your dives

◆ About Lite
This release uses Apple's shallow-depth API: depth display is capped at 6 m, while time, heart rate and GPS keep recording beyond it. A full-depth version is in progress.

◆ Requirements
• Depth and auto dive detection require an Apple Watch Ultra (depth gauge)
• Other Apple Watch models work in manual mode (HR, GPS, timers, log)
• The iPhone app manages spots and logs; the watch app runs independently

◆ Safety
This app is not a dive computer and must not be used for dive safety or decompression decisions. Not for scuba diving. Freediving is dangerous — never dive alone, follow one-up-one-down, and get certified training.

## Is U safe?

Not enough ratings yet to assess U.

## Is U legit?

U-Dive has limited verification signals. The AppsHunter Legitimacy Score for U is 50 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 3 releases)

### 2.0.1 — 2026-10-03

What's new in 2.0.1

◆ Dives past 6 m are no longer cut short
Going below the shallow-depth API's 6 m limit used to end the dive early and split it into two logs. The whole descent is now recorded as one dive:
• Past the limit, depth holds its last reading, marked in ice blue with a snowflake
• Dive time and heart rate keep recording
• The depth profile leaves the unmeasured stretch blank instead of filling in data that was never measured

◆ More reliable logging
• If the app closes unexpectedly, unfinished dive sessions are tidied up and synced to iPhone on next launch
• The end of each depth profile now matches when you actually surfaced

◆ Simulator
• A new button switches between the simple and detail dials on dry land

◆ Other
• Stability and performance improvements

### 2.0.0 — 2026-09-15

Version 2.0.0 redesigns the Apple Watch experience so you never have to touch the screen underwater.

◆ Fully touch-free
• During dives and surface intervals, every screen is driven by the Digital Crown and Action Button
• Turn the Crown to browse each dive of the current session
• Press the Action Button on a dive card to expand its depth profile and entry/exit map
• Press the Action Button while diving to switch between the simple and detailed dial

◆ More reliable dive records
• Lifting your wrist out of the water now ends the dive promptly instead of leaving the timer running
• Every depth profile starts and ends at the surface, giving a complete V-shaped curve
• The dive-end threshold is now 0.9 m, so a wrist resting below the surface no longer blocks it

◆ Alerts
• Depth alerts can be set from 0.5 to 40 m in 0.5 m steps
• Haptic count can be set from 1 to 20 pulses

◆ iPhone
• The dive spot map assigns each dive to its nearest spot, matching the dive log
• Depth, rate and heart-rate charts render more smoothly
• Clearer diagnostics when importing CSV, UDDF or FIT files

◆ Under the hood
• Watch-to-iPhone sync now includes the session end time
• Extensive internal cleanup for stability

### 1.0 — 2026-08-30

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-16.*