Symtrail
Keep track of every symptom, medication and dose.
Symtrail holds the fevers, the sore throats and the doses you gave at 2am — so when the paediatrician asks how often this happens, you have an answer instead of a guess pulled together in the waiting room.
Free to download. No account, no ads.
The pattern
Turn "he's always ill" into a chart
Some children spike a fever on something close to a schedule — the clinical name is PFAPA, periodic fever syndrome, and if that's where you've ended up searching, this is built for exactly that. Mark a child's profile and Symtrail groups the fever days into a single flare, works out the average gap between flares, and tells you the window when the next one is likely.
- Automatic flare grouping from temperature and symptom entries
- Average, shortest and longest gap between flares, updated every time
- A predicted window, so you can plan a birthday party or a work trip around it
The appointment
Walk in with a document, not an apology
Doctors get minutes, not hours. Symtrail exports a PDF, generated on your phone: the cycle summary, every flare with its dates, peak temperature and length, a 90-day temperature chart, then the full entry list underneath. Hand over the phone, or share the file before you even sit down.
Nothing is uploaded to make it — the report is built on your phone, from your own entries.
2am, one hand free
Built to log fast, in the dark, holding a hot, crying child
A temperature, a dose, a symptom — each one is a couple of taps, not a form. No typing required unless you want to add a note. It works exactly the same with the phone in aeroplane mode as it does at home with full signal, because it was never talking to a server in the first place.
The month, at a glance
See the whole picture, not just today
The calendar heat-maps every day by severity, so a bad week is visible before you even open it — and the lavender dots mark the window a flare is predicted, before it arrives. Search the full history by symptom, severity or date range to answer the question you'll actually be asked: when did this last happen?
One diary per child
Each child's history stands on its own
Add a profile for each child — name, birth date, a PFAPA toggle if it applies — and switch between them in a tap. Nothing gets mixed together, so one child's flare pattern is never diluted by another's cold. If you're tracking your own recurring migraines or fevers, add yourself too; it's the same diary, just one more person in it.
Privacy
This is your child's medical history. It stays on your phone.
Not encrypted-in-the-cloud. Not backed up to an account. On the device, full stop.
No account, no upload
There's nothing to sign up for. Symptoms, temperatures, medications and notes are saved on your phone and never sent anywhere.
Works with no signal
Airport mode, a dead zone in the hospital, a house with bad reception — logging doesn't care, because it never needed a connection.
Anonymous, coarse analytics only
We see which screens get used, as plain counts — never symptom names, temperatures, notes, or anything that identifies your child. Read the full privacy policy.
Questions
What people ask before they download it
Does this send my child's information anywhere?
No. Everything you log — symptoms, temperatures, doses, notes — stays on your phone and is never uploaded. We only see anonymous, coarse counts of which screens get used, never what you actually logged.
Do I need to make an account first?
No. There's no sign-up, no email, no password. Install it and start logging.
My son gets a fever every few weeks — is this what it's for?
Yes. Mark his profile as a PFAPA patient and Symtrail groups fever days into flares, works out the average gap between them, and shows the window when the next one is likely. It works just as well for any recurring pattern, whether or not it has a name yet.
What if I have no signal at the hospital?
Logging works fully offline — in a waiting room, a hospital corridor, or on a plane. Nothing about using Symtrail depends on a connection.
Can I track more than just my kids?
Yes. Symtrail keeps a separate diary per person, so alongside your children you can add yourself — useful if you're tracking your own recurring migraines or fevers too.
Will a doctor take a printout from an app seriously?
The report is your own observations laid out clearly — dates, temperatures, doses, flare patterns — not a diagnosis. It's built to make a five-minute appointment more useful, not to replace the conversation with your paediatrician.
Is Symtrail going to tell me what's wrong with my child?
No. Symtrail is a diary, not a medical device. It doesn't diagnose, treat or give medical advice — it just helps you keep track of what you're already observing, and show it to someone qualified.
Start tonight's entry before you forget it
Symtrail is out now on iPhone, with Android to follow — free, with nothing to sign up for.