Reef

Reef is a clean, focused scuba diving logbook for Android that helps recreational divers record and revisit underwater experiences. Reef lets you capture essential dive details such as depth, duration, water temperature, visibility, air consumption, tank pressure, dive site and personal notes, and save entries immediately after a dive. Designed to be simple and private, Reef works fully offline for liveaboards and remote reefs, supports photos and buddy lists, and tracks statistics like total dives and deepest dives.

Key Features

Log detailed dive data including depth, duration, water temperature, visibility, air consumption, tank pressure, dive site and notes to create a reliable record of every dive.

Works fully offline so you can record dives on liveaboards and remote reefs without an internet connection and save entries locally on your device.

Track dive statistics and trends such as total dives, deepest dive, longest bottom time and top dive sites by count to monitor your progress over time.

Attach photos to any log entry to build a visual story using images from your camera roll and pin dive sites on a map to build a personal underwater atlas.

Gear locker with service tracking monitors intervals by dive count and time for items such as BCDs, regulators, wetsuits and masks.

Advantages

Simple, clean interface tailored for recreational divers that makes logging fast and browsing your history straightforward.

Private logbook with no social network and no subscription required to log dives, keeping your records under your control.

Compatibility with major certification agencies including PADI, SSI, NAUI and CMAS and certification management to store credentials and see which certifications are valid or expiring.

Dive buddy tracking builds a searchable history of who you dived with across trips and locations.

Disadvantages

Focused on recreational diving, so it may not include specialized features needed by technical or commercial divers.

Intentionally private with no social features or community integration for sharing dives within the app.