Free to log. Pro to understand.
Pro shows how your diving is improving, not only what you did. The dive log itself stays free on both plans, and every new account starts with 14 days of Pro.
- Unlimited dives — no cap on your logbook
- Notes, gas, conditions and sightings on every dive
- Gear and training tracking
- Import from SSI, Garmin, Subsurface, UDDF or a spreadsheet; download from 105 dive computers on iPhone. Excel, UDDF, backup and a logbook PDF.
- Basic overview — totals, recent dives, depth & time charts, and your dives on a map
- Sync and cloud backup of your logbook
- Planning aids: decompression planner, nitrox, no-stop limits, minimum gas, weighting (including steel twinsets D12, D8.5 and D7), buoyancy swing, gas blending and best mix (aids, not a dive computer)
- Story, Wrapped and site memory
That’s €2.42 a month, billed once a year
€29 a year: less than one boat dive.
Billed monthly. Yearly saves you €29.80.
- Everything in Free
- Dive coachYour air, your habits, your next trip
- Weather, tides and sea lifeFor your sites, before you go
- Trends and insightsSAC, seasons, records, year on year
- Dive analysisAscent, safety stop and tissues
- Trip pack and reportReady before, a keepsake after
- Dive passportCards, insurance, medical. Offline
- PhotosiCloud sync, species, colours in one go
- Country map and offline mapsEvery country you have dived. No signal needed
- Apple WatchLast dive, next trip, surface time
All prices include VAT.
What Pro shows you
- All your trends. See how your diving changes over time: air consumption, conditions, seasons, sites and who you dive with.
- Trip reports. A summary after every trip, shared as an image or kept as a PDF.
- Dive profile analysis. Ascent rate, safety stop and tissues for any dive. Watching the replay is free. Information only, not a dive computer.
- Goals and year-on-year insights. Set a goal for the year and see how this year compares with the last.
Pay once
Lifetime — Pro for good, nothing renews
One payment, every Pro feature including the ones still to come, and nothing to cancel. On sale until 4 February 2027, unless the 500 go first. The free plan’s export stays free either way.
On the web
More ways into Pro
Duo: Pro for two
€6.90 a month, or €45 a year
Two accounts, one plan, for dive buddies who log together.
Give a year of Pro
€29, paid once
A year of Pro for a buddy or someone you teach. You get a code to hand over.
Dive professionals
12 months free
For verified dive professionals, divemaster and up, with active status. Send your pro card from the web app; we check it, then delete the photo.
These are bought on the web, in the web app’s Settings. They are not offered in the iPhone app (Apple’s rules).
Loggerfish is made by one diver in Hamburg. Pro is how it pays for itself.
Hi, I’m Felix: I dive, and I built Loggerfish so your logbook tells you more than a list of dives. Your data stays yours, and if something’s missing, tell me via Settings → Send feedback.
No ads. Your dives are never sold. Your logbook is never used to train AI.
Why is there a subscription at all?
Because some of this keeps taking work after the day you buy it: the analysis, which keeps gaining charts, the country map and offline maps, and the servers that sync and back up every logbook, free or not.
- Your logbook is free for good: unlimited dives, import, sync, Excel, UDDF and backup.
- Would rather not subscribe? Pay €99 once for Lifetime, on sale until 4 February 2027 unless the 500 go first.
- The 14-day Pro trial needs no card and ends by itself.
- Cancel with a button, no email needed, and keep Pro until the end of the period you paid for. A web purchase can be withdrawn within 14 days for a full refund.
Why pay when Subsurface is free?
- Most dive logs are free, and so is ours: unlimited dives, sync, every import and export, all planners.
- Pro pays for the analysis, the coach and the servers.
- If all you want is a free log with the widest computer support, Subsurface is a good choice, and its files import here.
In numbers
- 0dive cap
- 0ads
- 0data sold
- €0to export
See it
See your whole diving life at a glance
The numbers are already there, built from your dives. Nothing to set up.
- Your yearly forecast, against your goal
- Wrapped, your year in diving
- SAC trend, depth, time and monthly charts
- Sightings life list and best wildlife sites
- Water temperature, visibility, nitrox
Dives per year
52in 2026
Air consumption
14.0l/min
October 2026, the month’s average
Most dives at
10–20 m48%
- 0–10 m17%
- 10–20 m48%
- 20–30 m29%
- 30–40 m5%
- 40 m+<1%
117 of 243 dives
Sample data, from the demo logbook in the app.
Bluetooth · Free · iPhone
Supported dive computers
Download dives straight into the iPhone app. You see every dive before it’s saved.
Mares
Shearwater
Aqualung
Suunto
Verified: we downloaded real dives with it and checked them against the computer’s own log.
Another computer? Import its file: Garmin .fit, or UDDF from Shearwater Cloud or Subsurface. Free on every plan.
How it compares
Planning, costs and analytics in one log
Subsurface has a serious decompression planner; the SSI and PADI apps hold your certification cards. Loggerfish brings planning calculators, costs and a close look at your own dives into one place.
Deco stops, stages and caves: the decompression planner is free, inside your logbook.
| Loggerfish | MySSI | Subsurface | Shearwater Cloud | MacDive | |
|---|---|---|---|---|---|
| What it is for | Reading your own diving: analysis, planning calculators and what it costs | SSI courses and digital certification cards, a logbook, and dives verified by a dive centre or buddy by QR code | Open-source logbook with charts of your own statistics, and a planner (Bühlmann or VPM-B) on desktop; an open-circuit planner in the iOS app since 2025 | Companion app for Shearwater computers: download dives, see depth, decompression and temperature, update firmware | Logbook for Mac and iPhone, with dives downloaded from Bluetooth computers |
| Dives from a dive computer | By Bluetooth from 105 dive computers on iPhone (4 verified by us), free; other computers from Garmin FIT, Subsurface and UDDF files | From selected dive computers | From computers by about 40 makers, by USB, Bluetooth or Bluetooth LE | Shearwater computers only, by Bluetooth | From supported models, by Bluetooth |
| Import from other apps | SSI, Garmin FIT, Subsurface, UDDF and any spreadsheet, plus Apple Health on iPhone (iOS 17 or later); every change is previewed before it is saved | Scubapro dives, through Scubapro’s LogTrak app | From many logbooks and formats: MacDive, Suunto DM, DivingLog, UDDF, CSV and more | Databases from the older Shearwater Desktop | UDDF, Garmin FIT and DiveMate files |
| Export your whole log | Excel, UDDF or a full backup, any time | Spreadsheet (Excel or CSV) from my.DiveSSI.com | Subsurface XML, UDDF, CSV, HTML, divelogs.de and more | XML or UDDF files | UDDF files |
| Where it runs | Web app and iOS app | iOS, Android | Windows, macOS, Linux; Subsurface-mobile for iOS and Android | Windows, macOS, iOS, Android | macOS, iOS |
| Languages | 7: English, German, Spanish, French, Polish, Italian, Dutch | English (courses in 30+ languages) | About 20 (desktop app) | 13 languages | English only |
| Works without signal | Yes: log on the boat with no signal, and it syncs once you are back in range | Courses and certification cards work offline | Yes, online and offline | With an offline account, which keeps dives off the cloud | The iPhone app is a full log on its own, on the phone |
| Phone and web | The same logbook in any browser, on phone or computer, synced free | App, and an online logbook at my.DiveSSI.com | Phone app, and the cloud log viewable in any browser | Phone and desktop apps, with dives kept in Shearwater’s cloud | iPhone and Mac apps, kept in sync through iCloud or Dropbox |
| Price | Free plan, sync included; Pro €4.90 a month, €29 a year, or €99 once | Free | Free and open source | Free | See the App Store |
Shearwater says Shearwater Cloud will eventually be retired in favour of its newer app, Dive Shearwater, which for now is in English only and has no UDDF import.
Loggerfish is not the right choice if
- you need tissue and decompression analysis of your logged dives: Subsurface does that.
- you want a native Mac or Windows program: Subsurface and Diving Log are.
Switching from another app: PADI app alternative · MySSI export to Excel · Subsurface alternative for iPhone
Also in Loggerfish
- Analysis of your own dives Records, habits, forecasts, SAC trends, depth and time charts
- Dive-planning calculators 8 in the app: nitrox with EAD and MOD, no-stop limits, gas blending, best mix, minimum gas, weighting, buoyancy swing, and a decompression planner
- Costs of gear, training and trips Tracked per dive, per year and per item
- Trip budget and odds Cost per dive for each trip, a likelihood for Confirmed, Planned and Idea, and a forecast weighted by it; share a trip with your buddies
- Dive passport Certifications, insurance, medical certificate and last dive on one screen that opens offline (Pro)
- Site memory Your life list per site, what is still to find there, and your notes on entry, conditions and weighting
You can export all of your data at any time.
Compared with what each app lists on its own website and store pages, checked on 17 October 2026; the Shearwater column was read again on 10 November 2026. A row is in the table only where every app lists an answer. Spotted a mistake? Tell us and we’ll correct it.
Good to know
Questions, answered
What do I get without paying?
The logbook itself, for as long as you want it: unlimited dives, notes, gas, conditions and sightings, gear and certifications, your dives on a map, import, Bluetooth download and export, and sync across your devices. Pro adds the analytics, the dive coach, dive replay, the country map and offline map detail, the dive passport, trip reports and species from photos — and every new account starts with 14 days of Pro, free.
Can I import my existing logbook?
Yes. SSI (export from myDiveSSI.com), Garmin .fit files, Subsurface logs and UDDF files from other logbook programs import directly; any spreadsheet or CSV works by matching its columns once. For dives in the PADI app, there’s a grid to type or paste them into. Every import is previewed first. The iPhone app can also read dives saved in Apple Health (iOS 17 or later).
Do I need a connection to log a dive?
No. The app keeps your logbook on your device, so you can log from a boat with no signal. With an account, your dives sync once you’re back in range.
Is there an iOS app?
Yes. The iOS app is on the App Store.
Is my dive data private?
Yes. Your logbook lives on your device and, with a free account, syncs to your other devices, on both plans. Export all of it any time as an Excel file or a full backup. Nothing is shared by default.
Is there a limit on how many dives I can log?
No. The Free plan has no dive limit, and syncing your log across your devices is free too, as are your map and the Bluetooth download. Pro adds the deeper analysis, the dive coach, dive replay, the country map and offline map detail, and the dive passport.
What happens to my dives if Loggerfish disappears?
You keep them. The Excel file, the UDDF file and the full backup are free features and always will be — take a copy whenever you like and it opens without us. UDDF is the format other dive logbooks read, so your dives can move into one. That is the whole reason export is on the free plan. If we ever had to close the service, we would tell you by email at least three months ahead, keep the export open for 12 months from that notice, and refund any lifetime purchase made in the twelve months before.
Why a subscription instead of paying once?
You can pay once: Lifetime is €99, on sale until 4 February 2027 unless the 500 go first. Otherwise the logbook itself is free and stays free — unlimited dives, import, Excel, UDDF and backup — and Pro pays for the parts that keep taking work: the analysis, which keeps gaining charts, and the country map and offline maps. Yearly works out at €2.42 a month, and if you ever stop paying, your logbook and every export stay with you.
I already use the app that came with my dive computer.
Keep using it to get dives off the computer. Those apps read only their own maker’s hardware; Loggerfish takes dives from any of them, plus rentals and other people’s boats, in one log you can export.
My spreadsheet works fine.
Then bring it: match your columns once and every dive comes across. You get the charts you’d build by hand, and can export back to a spreadsheet any time.
Can Loggerfish get my dives over Bluetooth?
On iPhone, free on every plan, for 105 dive computers, 4 of them verified by us: they download over Bluetooth straight into your logbook, with the same preview as any import. The ones we have not tested are marked Beta. Any other computer comes in as a file: Garmin .fit directly, or UDDF from Shearwater Cloud or Subsurface. The import page lists every format Loggerfish reads.
What happens to my logbook if I stop paying?
Your dives stay exactly where they are. On the Free plan you keep every dive, your map, your imports and downloads, sync and all your exports, and what your dive passport holds stays readable. Pro’s analysis, coach, replay, country map and passport editing pause until you come back, and you keep Pro until the end of the period you have paid for.
Can I cancel easily, and get my money back?
Yes. You cancel a web subscription with a button in your account settings, or on the cancellation page without signing in. You can also withdraw within 14 days for a full refund. A purchase made in the iPhone app is managed and refunded through Apple. Lifetime is a single payment, so there is nothing to cancel.
