One File · Powerful fitness tracker
Every dive.
Every site. Every minute below.
A diving log in one HTML file. PADI-shaped fields, certifications, marine life tags — and a milestone banner that counts toward the 50 / 100 / 250 / 500 / 1000 dive career markers.
One payment · Yours forever · 14-day refund
- Works fully offline
- Installs as an app (PWA)
- No account, ever
- Yours, forever
Loads once, never needs the internet again. On a plane, in a basement, in a foreign hotel.
Every entry, every chart — stored locally. We never see it. We can't.
No subscription. No upgrades. No re-up next year. One file, yours.
Why log
Why divers keep logbooks.
Cert verification, dive-shop check-ins, insurance — and the actual record of where you've been.
Print-ready cert verification.
PADI shops want to see the logbook before you book a deep wreck. Single-file print preserves serials and entry times for verification — without a PADI account.
Career milestones matter.
50 (Advanced), 100 (Rescue), 250 (Divemaster). The tier card runs through them automatically as you log.
Marine-life tags compound.
Tags accumulate into a personal species log over time. Top sites + by-type donut reveal where you actually dive.
Tank pressure + bottom time = real data.
Surface air consumption (SAC) calculation possible from the fields. Useful for planning long deco hangs.
across 10 sites and 6 countries
OW / AOW / Rescue / EFR
no recurring fee, ever
log on the boat with no signal
Inside the file
Eight things you'll use every day. Plus a dozen more.
One file. One dashboard. Every feature you'd expect from a "real" app — without the cloud, the cookies, or the £8/month.
Quick add
Log a dive from the home screen — three taps and back to your day.
Live insight banner
The single number that matters today, computed in real time from your entries.
Streak calendar
Daily streak across the last weeks. Showing up becomes the default.
Tier progression
Lifetime totals roll into satisfying tier badges as you log.
By dive type
Visual split across categories so the pattern becomes obvious without squinting.
Searchable, sortable list
Every entry findable in seconds — search across notes, sort by anything.
Photo per entry
Optional photo field stored locally as base64 — never uploaded.
PNG share cards
One-tap share card of your stats, ready for Instagram or a group chat.
Offline, always
Loads once, runs forever without a network connection.
Installs as a PWA
Add to home screen — opens like any native app.
CSV in / CSV out
Bring your old data in. Take everything with you. No lock-in.
No account, ever
No email, no signup, no analytics, no third-party tracking.
Yours forever
If we vanish tomorrow, your tracker keeps working — local file, no server.
Light + dark
Auto-follows the system. Or pick one and stick with it.
Today
Today, at a glance.
The home screen pulls together what just happened and what's coming up — clean enough to actually look at every morning.
- Live insight banner — your unique angle, computed from your entries
- Four-tile stat grid surfacing the numbers that matter today
- Streak calendar showing the last weeks at a glance
- Quick-add button — log without leaving the home screen
- Recent entries on the dashboard so the last log is one tap away
Logbook
Every dive, in one place.
Dive #, date, site, max depth (m) per row. Sortable, searchable, groupable.
- Search across site, country / region, buddy / instructor
- Sorted by date (newest first)
- Group by type with one tap
- 20 fields per entry — the right amount of detail
Certifications
Every certification, in one place.
Course, agency, completed, instructor per row. Sortable, searchable, groupable.
- Search across course, instructor, where
- Sorted by completed (newest first)
- 7 fields per entry — the right amount of detail
Gallery
The whole jungle.
Every plant photo, in one grid. Tap any to see it full size.
- 20 fields per entry
How it's different
What you give up vs. PADI app. A central account.
Compared with the PADI app and dive log apps.
- Pricing modelPay once · $11.99£8 – £15 / month, forever
- Account requiredNoYes
- Cloud syncNoYes
- Print-ready cert formatYesLimited
- Marine-life taggingYesYes
- Data stays on your deviceYesNo
- Cert agency lock-inNoYes
The promise
Your logbook is yours.
Not PADI's.
Offline, always
Open it once, never need the internet again. The file holds the whole app.
Local-first storage
Every entry stored in your browser, on your device. No server sync. No leaks. Nothing to breach.
One payment, forever
No subscription, no upgrade tier, no nag. If we shut down OneFileClub tomorrow, your file keeps working.
Data does not sync automatically between phone and desktop
This is a local-first app — everything stays on the device you logged it on. To use it on both phone and desktop, use the built-in JSON or CSV export on one device and import on the other when you want to keep them in step.
Every view, light and dark.
A look at every screen across both themes — your tracker, populated.
Questions
Real answers, no fine print.
Will dive shops accept it for verification?+
Most accept print-outs. Some still ask for stamps. Bring both — the file is the record, the stamps are the ritual.
Does it support technical / CCR diving?+
Yes. Gas field includes air / nitrox / trimix / CCR. Mixed-gas logging is on the roadmap with deco-stop fields.
Where is my data stored?+
Locally, in your browser, on your device. Nothing is sent to OneFileClub or anyone else — there is no account, no cloud sync, no analytics.
Does it work offline?+
Yes. Once your personalised copy loads the first time, the entire tracker runs from a single HTML file. Airplane mode is fine.
What does 'personalised copy' mean?+
When you buy, OneFileClub stamps a private copy with your licence and deploys it to a unique URL just for you. You bookmark it, install it as an app, or save the file — and the file is yours, even if OneFileClub disappears tomorrow.
What is your refund policy?+
14 days, no questions asked. Email us, we'll process it and disable your private URL.
One payment.
A logbook for the deep.
We'll personalise a copy and email you a private link. Bookmark it, install it as an app, take it on the boat.
14-day refund · No subscription
