One File · Powerful health tracker
Every exposure.
Every reaction. Every elimination.
An allergy & reaction log in one HTML file. The unique trick: an elimination-diet timer that announces when you've crossed 30 days clear — the standard threshold for clinical re-introduction.
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 people with food sensitivities end up with diaries.
Elimination diets need a clock; the dashboard is the clock.
Elimination-banner counts days clear.
30 days clear is the clinical threshold for re-introduction. The dashboard tells you when you're past it.
Status ladder: suspected → eliminating → clear → confirmed / ruled-out.
The proper investigation flow. Each suspect lives in one stage; the donut shows the shape.
Symptom + exposure chips reveal patterns.
Across 20+ reactions, top exposures rank. Bloating + dairy on every fourth one? Visible.
Useful for the allergist's appointment.
Hand them the export. The systematic structure is exactly what they want to see.
dairy / gluten / peanut / pollen / cats
with severity + symptoms
no recurring fee, ever
private health record
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 reaction 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.
Suspects by status
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.
Rating system
Star or scale ratings per entry — the patterns surface in the dashboard.
PNG share cards
One-tap share card of your stats, ready for Instagram or a group chat.
Cross-entity links
Reference one entity from another — relationships stay intact across edits.
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
Suspects
Every suspect, in one place.
Suspected allergen, category, elimination status, started eliminating per row. Sortable, searchable, groupable.
- Search across suspected allergen, notes
- Sorted by suspected allergen (A→Z)
- Group by elimination status with one tap
- 5 fields per entry — the right amount of detail
Reactions
Every reaction, in one place.
Date, severity (1 mild · 5 anaphylaxis-like), suspected exposures (chips/text), treatment taken per row. Sortable, searchable, groupable.
- Search across treatment taken, notes
- Sorted by date (newest first)
- 7 fields per entry — the right amount of detail
How it's different
What you give up vs. allergy apps. AI symptom matching.
Compared with subscription allergy platforms.
- Pricing modelPay once · $6.99£8 – £15 / month, forever
- Account requiredNoYes
- AI symptom matchingNoYes
- Elimination-diet timerYesNo
- Status ladder for suspectsYesLimited
- Data stays on your deviceYesNo
- Insurance integrationNoYes
The promise
Your reactions are yours.
Not a medical platform'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.
FODMAP / histamine intolerance?+
Yes — categories include FODMAP and high-histamine alongside the standard food allergens.
Severe allergy / anaphylaxis tracking?+
Yes — severity 1-5, with EpiPen-noted treatment options. Status: confirmed-trigger flag for everyone-must-avoid.
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 diary that finds the cause.
We'll personalise a copy and email you a private link. Bookmark it, install it as an app, log the next reaction.
14-day refund · No subscription
