Meet Tempy: A Calm Fever Log for Young Children

It is 2:47 in the morning. Your toddler is hot. You took her temperature an hour ago — was it 101.6, or 102.6? You think you gave acetaminophen at 11:30, but the wrapper is in the trash and the kitchen light is on a dimmer. You open the notes app on your phone and start typing, then give up halfway through because she is crying again.

Tempy was built for that moment. It is a calm, offline-first fever log for parents of young children — the kind of app you can open with one hand in the dark, log a reading in three taps, and put down again. When the doctor's office opens at 8 AM, you hand over a clean timeline instead of trying to reconstruct the night from memory.

What Tempy actually does

Tempy keeps a running log of three things parents lose track of fastest during a fever: temperature readings, doses of acetaminophen or ibuprofen, and how your child is acting (sleeping, eating, drinking, behavior). Each entry is two or three taps. There is no account to create, no onboarding tour, no notification you have to dismiss. The app opens, you log, the app closes.

Behind the log, Tempy shows you the shape of the last 24 or 48 hours: a temperature curve, the time gap since the last dose, and a simple readout of patterns that pediatricians ask about — how high the peaks have been, whether fevers are climbing or falling, and whether anything has shifted suddenly. It is the kind of information that is obvious in hindsight but invisible when you are awake at 3 AM trying to remember what time you last took a reading.

The data lives on your phone. Tempy does not require an account, does not ship logs to a server you have to trust, and works the same whether you have signal or not. For something this intimate — a record of a sick child — that matters.

Who Tempy is for

Tempy is built for parents and caregivers of children roughly under eight: the age range where fevers are most common, most worrying, and hardest to interpret. It is not a thermometer — you still use whatever thermometer you trust. It is the layer above the thermometer that turns a series of one-off readings into a record you can act on and a record you can share.

It is especially useful in three situations parents tell us about repeatedly. The first is the long night, when a fever spikes after bedtime and you are making dose-timing decisions every few hours on no sleep. The second is the morning after, when you call the pediatrician's office and they ask "how high has it been and when?" and you want to answer in a sentence instead of fumbling through your camera roll. The third is the daycare or school handoff, when another caregiver needs to know what has happened in the last day without a fifteen-minute phone briefing.

What does Tempy actually replace?

For most parents, Tempy replaces a scrap of paper on the kitchen counter, the notes app, or a half-remembered mental timeline. Each of those has the same failure mode at 3 AM: under fatigue, the entries get sparse, the times get fuzzy, and by the morning you are not sure what you actually saw. Tempy's whole job is to make logging so cheap that you do it every time, so the record at sunrise is the same record you would have written if you had been wide awake.

It does not replace your pediatrician, your thermometer, or your judgment. It is a quiet record-keeping layer underneath all three.

Why we built it this way

Three design choices shaped almost everything else about Tempy. They are worth saying out loud, because they are the reasons it feels different from the typical "health app."

One-handed, in the dark. Every screen in Tempy is built around the assumption that you are holding a sick child with the other arm and your phone is on minimum brightness. Buttons are large. Forms are short. The default action is always one tap away. Nothing animates for longer than it needs to. The current dose-timing readout — "last dose 3h 12m ago" — is always one glance away on the home screen, because that is the question parents actually have.

Offline-first, account-free. Tempy works without internet and without a sign-up. Your child's fever record is yours. It lives on your phone. If you want to share it with another caregiver or your pediatrician, you export a timeline — you do not "invite" them to a cloud. We made this choice because medical-adjacent data deserves a higher bar than the typical app, and because the connection at the pediatrician's office is rarely as good as the connection at home.

Calm, not clinical; helpful, not advisory. Tempy will never tell you what dose to give, when to go to the ER, or whether a particular reading is "fine." Those are calls your pediatrician makes, with context Tempy does not have. What Tempy will do is hand you a clear, sortable, exportable record so the call your pediatrician makes is informed by good data instead of a tired parent's best guess. We think this is the honest line, and we hold it.

A typical Tempy night

You log the first reading around 9 PM when she feels warm at bedtime: 101.4°F, no medication yet. Tempy notes the time and graphs the single point. At 10:15 you give acetaminophen and tap the dose button — Tempy starts the countdown to the earliest next dose window. At midnight the reading is 102.1, climbing; at 2 AM it is 100.8, falling; at 4 AM it is 101.9 again, and you can see on the chart that the second peak is lower than the first. You go back to sleep.

In the morning you wake up, open the app, and see the night laid out as a curve with the dose markers in place. You forward it to the pediatrician's office. The triage nurse calls back and asks two questions, both of which Tempy already shows you the answer to. The whole exchange takes ninety seconds. That is the entire point of the app.

Where to start

Tempy is free to use and does not require an account. Open the app, log a reading, and the rest will make sense from there. There is no tutorial because there should not need to be one.

If your child is sick right now, log what you remember — even rough times help — and start logging fresh from the next reading. The first night is when Tempy earns its place on your home screen.

Tempy is a calm, offline-first fever log for parents — built so it survives 3 AM. Try it at tempy.eodin.app.