Modern dive computers record every dive you make — depth profiles, temperatures, gas mixes, ascent rates, and deco obligations — but that data lives on the wrist unit until you download it. Syncing your dives to an app or desktop software creates a permanent logbook, lets you review profiles graphically, and helps you spot patterns in your air consumption, dive planning, and overall progression as a diver.
Brand-Specific Apps
Shearwater Cloud syncs via Bluetooth to Shearwater's mobile and desktop app. Dive logs display full depth-time profiles with tissue loading graphs, gas consumption tracking, and exportable data. The cloud sync means your logbook is accessible from any device.
Suunto App connects to Suunto dive computers via Bluetooth. It provides detailed dive profiles, average and maximum depth overlays, water temperature charts, and social features for sharing dives with other Suunto users. The app also handles firmware updates.
Garmin Dive App pairs with Garmin Descent watches and displays dive logs alongside fitness and GPS data. Unique to Garmin: GPS-tagged entry and exit points create a map of your dive sites over time.
Third-Party Software
Subsurface is a free, open-source dive log application created by Linus Torvalds (of Linux fame). It imports data from virtually every dive computer brand via a USB or Bluetooth connection, displays detailed profiles, and tracks gas consumption, SAC rate, and statistics across your entire dive history. It's the most powerful free option available.
MacDive (macOS) and DiveMate (iOS/Android) are popular alternatives with cleaner interfaces and cloud sync capabilities.
Manual Logging Still Matters
Computer-generated logs capture the numbers, but they miss the experience. What did you see? What were conditions like? How did you feel? A brief note — even a single sentence — added to each digital log entry creates a richer record than raw data alone. Many divers keep a small waterproof notebook in their save-a-dive kit for jotting notes between dives, then transfer those observations to their digital log later.
Data Formats & Export
Most apps export dive data in UDDF (Universal Dive Data Format) or as CSV files. UDDF is the closest thing to a universal standard and can be imported into Subsurface, DiveBoard, and most other logging platforms. If you switch dive computer brands, UDDF export ensures your historical data comes with you.