Track chronic illness symptoms, meds, triggers and energy with FlareLog. Free, private symptom tracker with printable doctor visit briefs. No login.
Living with a chronic condition means juggling daily symptoms, medications, energy limits, and short doctor appointments. FlareLog is a free, zero-clutter daily health utility designed to help you spot patterns and walk into medical appointments prepared.
Unlike typical health apps that require accounts, subscriptions, or cloud storage, FlareLog runs 100% locally in your web browser. Your health data never leaves your device, it works offline, and it loads in seconds — even on the tough flare-up days.
What FlareLog does
60-Second Daily Check-In
Log pain, fatigue, brain fog, and mood using simple, thumb-friendly sliders and one-tap trigger tags. Fast enough to finish on a high-symptom day.
Daily Pillbox & Rescue Med Timer
Check off scheduled doses and track the exact time since your last as-needed rescue medication — the number that prevents accidental double-dosing.
Visual Energy Pacing (“Spoon” Budget)
Track your daily energy capacity visually so you can pace activities and avoid post-exertion crashes.
“Brain Fog” Low-Friction Mode
Switch to an oversized, high-contrast interface with a single tap when vision strain or fatigue makes screens hard to read.
One-Click Doctor Visit Brief
Automatically turn weeks of symptom logs and triggers into a clean, printable summary formatted for US Letter paper or PDF.
Emergency Card & Local Backups
Keep vital medical info, allergies, and insurance details ready for clinic check-ins, with one-click export to back up your data anytime.
Built for the full range of chronic conditions
Three in four American adults live with at least one chronic condition, and over half manage two or more. FlareLog starts by asking which conditions apply to you, then loads the symptoms, triggers, and vitals that usually matter for those — and you can edit every one of them.
- Fibromyalgia
- ME/CFS and long COVID
- Migraine and multiple sclerosis
- Lupus, rheumatoid arthritis, and osteoarthritis
- Crohn’s disease, ulcerative colitis, and IBS
- Type 1 and type 2 diabetes
- Hypertension and heart disease
- Asthma and COPD
- Chronic kidney disease
- POTS and dysautonomia
- Endometriosis and PCOS
- Eczema, psoriasis, and allergic rhinitis
- Depression and anxiety
- Thyroid conditions
- Cancer treatment support
- Post-stroke
How a private symptom diary works
- Open the page. No signup, no email, no app store.
- Pick your conditions. 90 seconds, and you can change it any time.
- Check in daily. Four sliders and a couple of taps — that’s the whole habit.
- Print the brief before an appointment. Hand it over at check-in, or bring it into the room.
- Back up. Export the JSON file now and then; it is the only copy that exists outside your browser.
Why your data stays on your device
FlareLog stores everything in your browser’s local storage. There is no account, no server holding your history, no analytics watching what you type, and no advertising. It makes no third-party requests at all — no fonts, no tracking pixels, no outside services. Once the page has loaded, you can turn off your internet and keep using it.
That also means the safety net is in your hands: use the Backup & Data panel to save a copy you control, and restore it on any device.
Frequently asked questions
Is FlareLog free?
Yes — free, with no subscription, no account, and no ads.
Do I need to create an account?
No. There is no login anywhere in FlareLog. That is a design choice, not an oversight: a private health tracker should not need your email address.
Where is my health data stored?
Only in your own browser, on your own device. Nothing is uploaded. Clearing your browser data will erase it, which is why the app includes a one-click backup.
Can I print my symptom log for my doctor?
Yes. The Doctor Prep tab builds a printable visit brief for 14, 30, or 90 days — symptom averages, top triggers, medication adherence, vitals, lab results, and your questions — formatted for US Letter and also saveable as a PDF.
Does FlareLog work offline?
Yes. After the page loads, it works with no internet connection at all.
Is FlareLog a medical device?
No. It is a personal journal and organizer. It does not diagnose, treat, or give medical advice, and it never tells you what dose to take. In an emergency, call 911.
What happens if I switch phones?
Export the backup file and import it on the new device, or use the transfer link in the Vault — it carries your data in part of the link that browsers never send to a server.
Is this good for fibromyalgia, long COVID, or POTS?
Yes. Those are three of the twenty-five condition packs included, each with its own symptom and trigger vocabulary. POTS also gets heart-rate and blood-pressure tracking; long COVID and ME/CFS get post-exertional after-effect follow-ups.
Important information
Medical disclaimer. FlareLog is a personal health journal and organizer, not a medical device. It does not diagnose, treat, cure, or prevent any condition and does not provide medical advice. Always seek the advice of a qualified health provider with any questions about a medical condition. Never disregard professional medical advice or delay seeking it because of something you read here. If you think you may have a medical emergency, call 911. If you are in crisis, call or text 988.
Privacy summary. FlareLog does not collect, transmit, or store your health information on our servers. All entries live in your browser on your device. The tool sets no cookies of its own and loads nothing from third parties.