Comprehensive Dive Logging
-Every dive, fully detailed and in your control.
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- Depth, duration, temperatures, conditions -
- Multi-tank gas mixes: air, nitrox, trimix -
- Buddies, trips, tags, and ratings -
- Sortable table or card views -
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-Submersion gives scuba divers full ownership of their logbooks — no proprietary formats, no cloud lock-in, no subscription fees. Track analytics, stats, records, and trends across your dives, all stored locally and exportable to open standards. Free and open-source, forever.
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-Comprehensive Dive Logging-Every dive, fully detailed and in your control. -
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-Profile & Decompression Analysis-Serious technical-diving instrumentation. -
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-300+ Dive Computers-Download dives directly from your computer. -
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-Sites, GPS & Conditions-Location and environment for every dive. -
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-Statistics & Records-See your diving life at a glance. -
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+### Comprehensive Dive Logging
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+Every dive, fully detailed and in your control.
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+- Depth, duration, temperatures, conditions, weather and tide
+- Any number of cylinders: air, nitrox, trimix, CCR and SCR
+- Buddies, divemasters, trips, tags, ratings and signatures
+- Cards, or a sortable table with the columns you choose
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+### Profile & Decompression Analysis
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+Serious technical-diving instrumentation.
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+- Bühlmann ZH-L16C with your own gradient factors
+- All 16 tissue compartments, nitrogen and helium
+- CNS%, OTU and ppO₂ with daily and weekly totals
+- Your computer's NDL, ceiling and TTS beside the model's
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+### 350+ Dive Computers
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+Download straight from your computer.
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+- 30 manufacturers over Bluetooth LE and USB
+- Incremental downloads: only what is new
+- Duplicate review with four ways to resolve a match
+- Two computers on one dive, profiles overlaid
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+### Sites, Maps & Marine Life
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+Where you dove, and what lives there.
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+- 3,600 dive sites and 3,600 dive centers built in
+- Clustering, a dive heat map, and offline map regions
+- Bathymetry overlays and 3D seafloor terrain
+- 685 species, recorded per dive and per site
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+### Dive Planning & Gas
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+Plan with the gas, gear and tissues you will actually have.
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+- Multi-segment plans for OC, CCR, SCR and PSCR
+- Bailout checked against the worst moment of the profile
+- Contingencies, range tables and repetitive-dive seeding
+- MOD, best mix, rock bottom, and a real-gas blender
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+### Photos, Gear & Certifications
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+The rest of what a dive leaves behind.
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+- Photos and video matched to a dive by capture time
+- Each shot marked at its depth on the profile
+- Equipment with service schedules, reminders and costs
+- A wallet of certification cards, plus courses and checklists
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+### Statistics & Records
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+See your diving life at a glance.
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+- Ten pages: totals, progression, conditions, gas and more
+- Personal records: deepest, longest, coldest, warmest
+- Breakdowns by year, country, site and dive type
+- SAC trends, depth distribution and ascent-rate analysis
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+### Your Data, Encrypted
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+No server. No account. No lock-in.
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+- SQLite encrypted at rest, opened with Face ID, Touch ID or a passphrase
+- End-to-end encrypted sync through your own iCloud, Google Drive, Dropbox or S3
+- Encrypted backups, one taken automatically before every upgrade
+- Export to UDDF 3.2, CSV, Excel, KML, GPX and printable PDF
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Full-screen profile playback · The 16 tissue compartments as a landscape · A site's 3D seafloor with the dive's path
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Species sightings across the log · The blender's fill procedure and cost · Five themes, each in light and dark
## Why Submersion? Most dive logging software falls into two categories: desktop applications stuck in the past, or mobile apps that lock your data in proprietary clouds. Submersion is different: -- **You Control Your Data** — All data is stored locally in SQLite and can be synced across devices through cloud storage. No account required. No cloud dependency. Export everything, anytime. -- **Truly Cross-Platform** — One app for iOS, Android, macOS, Windows, and Linux. Your logbook works everywhere, with the same details and analytics on all platforms. Available in 10 languages. -- **Open Standards** — Full UDDF 3.2 import/export. CSV support. No proprietary formats trapping your dive history. -- **300+ Dive Computers supported** — Connect via USB or Bluetooth. Powered by [libdivecomputer](https://www.libdivecomputer.org/). -- **Technical Diving Ready** — Bühlmann ZH-L16C decompression, multi-gas support, CNS/OTU tracking, trimix blending, CCR/SCR rebreather support. -- **Sync Across Devices** — Optional cloud sync via iCloud or Google Drive. No account required — sync is opt-in and your data stays yours. -- **Free Forever** — Open source under GPL-3.0. No premium tiers for core features. No ads. +- **You control your data:** an SQLite database on your own hardware, encrypted at rest. No account, no server, no cloud dependency. Export everything, anytime. +- **Truly cross-platform:** one app for iOS, Android, macOS, Windows and Linux, with the same details and analytics everywhere. Available in 11 languages. +- **Open standards:** full UDDF 3.2 import and export, plus CSV, Excel, KML and GPX. No proprietary format trapping your dive history. +- **350+ dive computers:** Bluetooth LE and USB, across 30 manufacturers, powered by [libdivecomputer](https://www.libdivecomputer.org/). +- **Technical diving ready:** Bühlmann ZH-L16C with gradient factors, multi-gas and CCR/SCR support, CNS and OTU tracking, bailout planning and trimix blending. +- **Sync on your terms:** end-to-end encrypted sync between your devices through your own iCloud, Google Drive, Dropbox or S3-compatible storage. +- **Free forever:** open source under GPL-3.0. No ads, no subscription, no in-app purchases. ## Download -- **macOS / Windows / Linux / Android** — [GitHub Releases](https://github.com/submersion-app/submersion/releases) -- **iOS** — [App Store](https://apps.apple.com/us/app/submersion-dive-log/id6757456915) +- **macOS / Windows / Linux / Android:** [GitHub Releases](https://github.com/submersion-app/submersion/releases) +- **iOS:** [App Store](https://apps.apple.com/us/app/submersion-dive-log/id6757456915) ### Beta channel @@ -114,111 +163,83 @@ of the stable release; downgrading is not supported, and devices that sync together should all use the same channel. A backup is taken automatically before any database upgrade. -- **Desktop** — Settings > About > Update channel > Beta (updates then arrive +- **Desktop:** Settings > About > Update channel > Beta (updates then arrive through the normal auto-updater), or download directly from [beta-builds](https://github.com/submersion-app/beta-builds/releases) -- **Android** — [join the open test](https://play.google.com/apps/testing/app.submersion), +- **Android:** [join the open test](https://play.google.com/apps/testing/app.submersion), then Play delivers beta updates automatically -- **iOS / Mac App Store** — [join via TestFlight](https://testflight.apple.com/join/aMD393sB) +- **iOS / Mac App Store:** [join via TestFlight](https://testflight.apple.com/join/aMD393sB) ## Data Philosophy Submersion is built on these principles: -1. **Local-First** — Your data lives on your device. The app works offline, always. -2. **No Lock-In** — Export your entire logbook to UDDF or CSV at any time. Switch apps without losing history. -3. **No Account Required** — Use the app immediately. No sign-up, no email, no tracking. -4. **Open Source** — Audit the code. Fork it. Improve it. Your dive log software should be transparent. +1. **Local-First:** your data lives on your device. The app works offline, always. +2. **No Lock-In:** export your entire logbook to UDDF or CSV at any time. Switch apps without losing history. +3. **No Account Required:** use the app immediately. No sign-up, no email, no tracking. +4. **Open Source:** audit the code. Fork it. Improve it. Your dive log software should be transparent. ## Features -### Dive Logging +Beyond what the screens above show. -- Comprehensive dive entry with depth, duration, temperatures, conditions -- Automatic dive numbering with gap detection and renumbering -- Entry/exit times with surface interval calculation -- Multi-tank support with gas mixes (air, nitrox, trimix) -- Buddy tracking with roles (buddy, guide, instructor, student) -- Trip organization for multi-dive expeditions -- Tags, favorites, and star ratings -- Free-text notes +### Import from Elsewhere -### Dive Sites +- **File import:** Subsurface, MacDive, Shearwater Cloud, Garmin FIT, DAN DL7, Ratio and UDDF. +- **CSV import:** presets for MySSI, Diving Log, DiveMate, Garmin Connect and Shearwater Cloud, or map the columns yourself. +- **Apple Health:** underwater workouts recorded by an Apple Watch, with depth, temperature and heart rate. +- **Paper logbooks:** scan the pages and OCR reads the entries for you to check and import. -- Full site database with GPS coordinates -- Interactive maps with clustering -- Capture location from device GPS -- Reverse geocoding for country/region -- Depth ranges, difficulty ratings, hazard notes -- Weather and tide data integration +### In the Log -### Dive Computer Integration +- **Conditions:** visibility, current, swell, entry and exit method, altitude. Weather is fetched for the date and place; tides come from a bundled global model and work offline. +- **People:** your role on the dive, dive center, operator and boat. A buddy or instructor can sign the dive on your screen. +- **Gas detail:** oxygen and helium fractions per cylinder, start and end pressure, and the pressure trace from an air-integrated transmitter. +- **Weights:** what you carried, where you put it, and whether it felt right. +- **Your own fields:** colored tags, dive types you define, and custom fields for whatever your agency or your habits call for. +- **Bulk edit:** fix a whole trip's entries at once. +- **Safety review:** each profile is checked for fast ascents, sawtooth patterns and missed safety stops. +- **Several divers:** separate profiles per diver, each with emergency contacts, medical notes and insurance details. -- **300+ supported dive computers** via libdivecomputer -- Bluetooth LE and USB connectivity -- Manufacturer protocols: Shearwater, Suunto, Mares, Aqualung, and more -- Incremental downloads (new dives only) -- Duplicate detection with fuzzy matching -- Multi-computer support with profile selection +### Sites & Trips -> **Confirmed working:** Shearwater Teric, Aqualung i300C, Aqualung i330R. Have a different dive computer? [Help us expand this list](https://github.com/submersion-app/submersion/issues) - we're looking for testers! +- **Site records:** depth range, difficulty, water type, hazards, access notes, mooring and parking, with reverse-geocoded country and region. +- **Reef data:** protection status, habitat, bleaching alerts and reef health for the sites you visit. +- **Trips:** dates, resort or liveaboard, a day-by-day itinerary, preparation checklists, and a gallery for the whole trip. ### Profile Analysis -- Interactive depth/temperature/pressure/SAC charts with zoom and pan -- Touch markers showing various metrics -- Ascent rate calculation with color-coded warnings -- Profile event markers (descent, safety stop, gas switch) -- SAC/RMV overlay - -### Decompression & Technical Diving - -- Bühlmann ZH-L16C algorithm with gradient factors -- Real-time NDL, ceiling, and TTS calculations -- 16-compartment tissue loading visualization -- CNS% and OTU oxygen toxicity tracking -- ppO₂ curve with warning thresholds -- MOD/END/EAD calculations -- CCR (closed circuit) and SCR (semi-closed) rebreather support -- Dive planner with multi-level profiles, gas planning, and deco schedules - -### Equipment Management - -- Track all gear with serial numbers, purchase dates, service intervals -- Service reminders with visual warnings -- Equipment sets ("bags") for quick selection -- Weight calculator based on exposure suit and tank type -- Per-dive gear tracking +- **Playback:** play or scrub the profile, overlaying temperature, tank pressure, heart rate, SAC, ppO₂, ppN₂, ppHe, gas density, gradient factor, TTS, ceiling, NDL and deco stops. +- **Ascent rate:** drawn on the profile and colored where it exceeds the limits. +- **3D:** move through the dive in three dimensions, or view the 16 tissue compartments as a surface. +- **Edit:** trim a profile that started on the boat, with undo if you get it wrong. -### Certifications & Training +### Planning & Calculators -- Store all certifications with card numbers and dates -- Agency support: PADI, SSI, NAUI, SDI/TDI, GUE, RAID, and more -- Expiry tracking with warnings -- Instructor and dive center records +- **Weighting:** a buoyancy model built from your logged dives predicts what to carry for a new suit, cylinder or water type. +- **Gas calculators:** MOD, best mix, maximum narcotic depth, consumption and rock bottom. +- **Blender:** partial-pressure fills worked out with a real-gas equation, and the fill invoice. +- **On the slate:** export the plan as a PDF for your wet notes. -### Statistics & Records +### Equipment & Training -- Total dives, bottom time, depth statistics -- Breakdown by year, country, site, dive type -- Personal records: deepest, longest, coldest, warmest -- Depth distribution histograms +- **Equipment sets:** build a configuration once and apply it to a dive; a set can select itself by location. +- **Service log:** what was done, when, and what it cost. +- **Courses:** track a course's requirements and link each one to the dive that satisfied it. +- **Checklists:** run a pre-dive checklist from a template and attach the session to the log. -### Import & Export +### Data & Preferences -- **UDDF 3.2** — Universal Dive Data Format, the open standard -- **CSV** — Spreadsheet-compatible with configurable columns -- **Excel** — Multi-sheet .xlsx with statistics -- **PDF** — Printable logbook pages with multiple templates -- **KML** — Google Earth export with dive site placemarks -- **Universal Import** — Import from Subsurface, MacDive, Diving Log, DiveMate, and more -- Full database backup and restore (local, iCloud, or Google Drive) +- **Data quality:** an assistant that finds duplicates and anomalies across the log and walks you through fixing them. +- **PDF logbooks:** Simple, Detailed, Professional, PADI and NAUI layouts. +- **Your units:** independent settings for depth, temperature, pressure, volume, weight, altitude and SAC. +- **Your language:** 11 languages, five themes in light and dark, and keyboard shortcuts on the desktop. ## Getting Started ### Prerequisites -- [Flutter SDK](https://flutter.dev/docs/get-started/install) 3.5.0 or higher +- [Flutter SDK](https://flutter.dev/docs/get-started/install) 3.47.0 or newer (CI pins the exact version in [.github/flutter-version.txt](.github/flutter-version.txt)) ### Quick Start @@ -288,7 +309,7 @@ The built app will be at `build/macos/Build/Products/Release/submersion.app`. 2. Select "Open" from the context menu 3. Click "Open" in the dialog that appears -You only need to do this once — subsequent launches will work normally. +You only need to do this once; subsequent launches will work normally. > **Note:** This build cannot be distributed via the Mac App Store (which requires sandboxing). It's intended for local testing and direct distribution. @@ -310,6 +331,72 @@ The built app will be at `build\windows\x64\runner\Release\`. +