Your dive log, planner and trips — all in one app
Every dive you’ve done, in one logbook.
See what your diving adds up to, and let every site remember it. Bring your log from SSI, Garmin or Subsurface in a minute; it's free with no dive cap.
Works in any browser. The iOS app is in testing.
Why Loggerfish
A logbook that gives something back.
Free to log, with no dive cap. Pro adds the insights.
Insights and your dive coach
What your diving adds up to: habits, records, depth and time over the years, cost per dive. Your air use against your own history, and gear and lead before a trip.
Forecast against your goal
Where this year is heading against the target you set, and this year against last.
Wrapped: your year in diving
Your year as an image or a short video, and your logbook on its anniversary.
Every site remembers
Where you got in, what it is usually like, the lead that worked, the last visibility and temperature.
Your dives as a story
Your logbook read as a journal: a chapter for each trip, with its photos, firsts and records.
Dive passport
Certifications, insurance, medical and your last dive on one screen, even with no signal.
Decompression planner
Bühlmann ZH-L16C with gradient factors, inside your logbook. A planning aid, not a dive computer.
Straight from your dive computer
Download dives over Bluetooth on iPhone from a Mares Sirius or Shearwater Peregrine TX.
Plan ahead
Your next trip, already counted.
Budget, cost per dive and how likely each trip is.
Lanzarote
Marsa Alam
Sample trips
Cost per dive for every trip, and a forecast weighted by how likely each one is: Confirmed, Planned or Idea. Share a trip with your buddies.
In numbers
- 0dive cap
- 0ads
- 0data sold
- €0to export
Leave any time
Your logbook leaves with you, any time. Free, for good.
Excel, UDDF and a full backup. Always.
- Excel
- UDDF
- Full backup
Excel, UDDF and a full backup of every dive, on the free plan, for good. Bring it in from SSI, Garmin, Subsurface, UDDF or any spreadsheet, previewed first; a Mares Sirius or a Shearwater Peregrine TX downloads over Bluetooth on iPhone with Pro.
Excel and UDDF, free
Every dive and field in one spreadsheet, or UDDF for Subsurface, Diving Log and others. Neither needs Loggerfish to open.
Full backup, free
Your whole logbook, profiles included, in one file. Restore it on any device.
Bring it in, too
From SSI, Garmin, Subsurface, UDDF or any spreadsheet, or typed across from the PADI app.
PADI app: its padi.com page and its App Store listing name no logbook export, as read on 25 October 2026.
Free to log. Pro to understand.
Pro shows how your diving is improving, not only what you did. The logbook 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 certifications tracking
- Import from SSI, Garmin, Subsurface, UDDF or any spreadsheet; Excel export and full backup
- Basic overview — totals, recent dives, depth & time charts
- Sync and cloud backup across your devices
- Planning aids: nitrox, no-stop limits, minimum gas, weighting (including steel twinsets D12, D8.5 and D7), gas blending and best mix (aids, not a dive computer)
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
- Advanced analytics — SAC trend, forecast vs target, seasonality, conditions and gas, sightings life list
- Dive-site maps — your dives on the map, and sites near yours. In the iPhone app, offline map detail: coastlines, reefs and place names for around 490 dive areas
- New features before anyone else
- Trip reports — new sites, first sightings and cost per dive, as a picture to share and a PDF to keep
- Dive coach — your air use against your own history by depth, water temperature and suit, a look back at your last dive, and gear and lead before you travel
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. Replay a dive and see your ascent rate and safety stop at each moment. 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
Founding offer: until 500 are sold or 90 days after launch, whichever comes first. One payment, every Pro feature including the ones still to come, and nothing to cancel. 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
25% off Pro
Instructors, divemasters and guides get 25% off, for as long as they keep Pro. Your word is enough.
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 myself, and I built Loggerfish because a logbook should do more than list dives: it shows how your air consumption is changing, what each dive really costs, when your gear is due for service, everything you’ve seen down there, and whether you’re on track for this year’s goal. The more you log, the more it tells you about your diving.
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 dive-site 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 Pro (the first 500, or until 90 days after launch).
- 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.
How €29 a year compares
Priced like the activity apps you may already pay for: well under half a Strava subscription, and less than a year of AllTrails+.
| App | Per year | For |
|---|---|---|
| Strava | €74.99 | Running and cycling: training analysis, routes |
| AllTrails+ | €35.99 | Hiking: offline maps, trail alerts |
| Loggerfish Pro | €29 | Diving: SAC trends, forecasts, dive-site maps. Logging, export and sync stay free. |
Annual list prices in Germany as published by each company, 17 October 2026. They set their own prices and may change them; Strava and AllTrails are trademarks of their owners.
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 the Mares Sirius or the Shearwater Peregrine TX on iPhone, with Pro; 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 today; iOS app in testing | iOS, Android | Windows, macOS, Linux; Subsurface-mobile for iOS and Android | Windows, macOS, iOS, Android | macOS, iOS |
| Languages | 5: English, German, Spanish, French, Polish | 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.
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. A row is in the table only where every app lists an answer. Spotted a mistake? Tell us and we’ll correct it.
Switching
Bring your logbook with you
Import from SSI, Garmin, Subsurface, UDDF or any spreadsheet. Dives in the PADI app? There’s a grid to type or paste them into. Every change is previewed before it’s written.
Coming from MySSI? Export there, import here in a minute, then keep your own copy in Excel or UDDF.
Step-by-step guides: from Garmin Connect · from Shearwater Cloud · from MySSI · from MacDive · from Suunto
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
Screenshots show the app with sample data.
The app itself
The screens you’ll spend your time in
The app as it is today. Open the sample logbook in one click.
Everywhere
One logbook, every device
The web app does it all today. The iOS app uses the same code and data, and is in testing.
Web app
Any modern browser, desktop or phone. Nothing to install.
iOS app
Log offline on the boat; it syncs once you have signal. The App Store comes next.
An Android app comes later.
Tell me when the iOS app is on the App Store
The iOS app is in testing. Leave your address for one email when it reaches the App Store; choose Android if you would like to hear about that too. The web app works today, free.
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, import and export, and sync across your devices. Pro adds the analytics, the dive-site maps (with offline detail in the iPhone app), the dive passport and downloading from your dive computer — 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, in testing now, 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.
Will there be a real iOS app?
Yes, it exists. It’s built from the same code as the web app and runs on real phones today; what’s left before the App Store is submission and review.
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. Pro adds the deeper analysis, the dive-site maps (with offline detail in the iPhone app), the dive passport and downloading from your dive computer.
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 say so at least three months ahead, keep the export working throughout, and refund any lifetime purchase made in the twelve months before.
Why a subscription instead of paying once?
You can pay once: there is a lifetime licence at €99, a founding offer until 500 are sold or 90 days after launch, whichever comes 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 dive-site 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, with Pro, for two dive computers: the Mares Sirius and the Shearwater Peregrine TX download over Bluetooth straight into your logbook, with the same preview as any import. Other dive computers are not supported yet; their dives come in as a file: Garmin .fit directly, or UDDF from Shearwater Cloud or Subsurface. Importing a file stays free on every plan. 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 imports, sync and all your exports. Pro’s analysis, dive-site maps, dive passport and download from your dive computer 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.
Guides: Keeping a logbook for a course: Advanced Open Water and beyond · Best dive log app? Eight questions to ask before you pick one · A dive log for instructors and divemasters: what to look for · Dive logbook software: desktop, web or phone? · How to log a dive: what to write down, and what you can skip · Logging what you see underwater: a sightings list for every dive · Nitrox MOD explained: how to work out your maximum depth · An offline dive log: log dives with no signal, and keep them safe · Paper logbook or dive log app? How to choose, or use both · SAC rate explained: how to calculate your air consumption · A dive log for technical and decompression dives: what to record · More guides
