Body Temperature・Fever Tracker

Review by eFreeware

Most health apps try to measure something. This one deliberately does not. Body Temperature Fever Tracker, from the developer Firehawk, is a diary for writing down temperatures, symptoms and medication, and the app says plainly that it is not a measurement tool. The warning it raises once a recorded reading passes 37.5 °C (99.5 °F) is the closest it comes to judgment, and even that is just a flag on what you typed in.

That framing tells you a lot about who it is for. Anyone expecting a phone to take a temperature will be disappointed, but a household that already owns a thermometer and wants a single place to keep a record of illnesses has a clear use for it. The app has been installed more than a million times, and its 2.5 average from 7,212 ratings suggests a mixed reception among those users.

A diary you fill in yourself

The core of the app is an input field. You take a reading with your own thermometer, enter it, and add whatever symptoms you are noticing at the same time. Every entry is stamped with the date and time, so the record builds into a timeline rather than a pile of loose numbers.

The developer presents this as a self-assessment tool: the more consistently you enter readings, the more useful the overview becomes. That is a fair description of how a diary works, and it also sets the expectation correctly. The app organizes and stores what you give it.

Alongside temperature and symptoms, the app has a field for medication. That matters more than it might sound. A parent tracking a child's fever over several days usually wants to know when the last dose was given, and keeping that next to the temperature reading in one record is the obvious way to do it.

The 37.5 °C warning and what it means

The feature the developer highlights most is the alert that appears when a recorded temperature goes above 37.5 °C, or 99.5 °F. The app treats that threshold as a potentially high fever and flags it for you.

I would read that as a convenience rather than a diagnosis. It saves you from scanning a list of numbers to spot the high ones, and for someone logging readings several times a day during an illness, that is a small but real help. What it cannot do is tell you whether a fever matters in your particular case, and the app is explicit that it is informational only and no substitute for professional medical advice or treatment.

The developer also includes a short explainer on what a fever is, describing a body temperature above the normal range and the chills or muscle pain that can come with it. It is background reading rather than guidance, and it sits alongside the disclaimer rather than replacing it.

Contacts, reports and a record for the household

Beyond the illness log, the app includes a daily contact diary. You record the people you have been in contact with, which the developer frames as a way to identify where an illness may have come from and to support contact tracing. It is a simple log, and it only becomes useful if you keep it up before you need it.

There is also space to store medical reports inside the app, so test results and documents sit next to the readings they relate to instead of in a separate folder. The app keeps your health records in one place, which is a reasonable thing to want for a household managing several people's paperwork.

The app is built to hold records for more than one person. Temperatures, symptoms and medication can be logged for everyone in the family, which pushes it toward shared household use rather than a single user's private log. Everything is kept on the phone itself, and an export function lets you take the data out when you need to.

What it asks of you, and where the friction sits

The app is free to install and carries ads, and it also offers in-app purchases. They are part of the deal, and anyone who dislikes advertising in a tool they open several times a day should weigh that before installing.

The bigger cost is your own consistency. A diary is only as good as its entries, and the developer's own advice is to use the app every day for the most accurate and useful results. If you enter a reading once and forget about it for a week, the timeline has a hole in it and the overview loses much of its value.

There is a practical limit worth stating plainly: the app does not measure anything. You need a working thermometer to use it at all, and the quality of the record depends on how carefully you take and enter each reading. The developer is upfront about this, describing the app as a diary rather than a measurement tool and directing anyone facing a medical emergency to a doctor or the local emergency service.

The app was released in March 2020 and its most recent update, in October 2026, was listed simply as bug fixes. That suggests upkeep rather than new direction, which is what I would want from a utility of this sort.

Who gets real use out of it

The people most likely to keep this installed are parents and caregivers running a household where someone is ill for several days at a time. Logging a child's temperature, symptoms and medicine doses in one timeline, and being able to hand that record to a doctor, is the scenario the app is built around.

It also fits anyone who needs documentation of their own monitoring. It is aimed at people who have to show records to an employer or a health authority, and the export function exists for exactly that kind of handover. Someone who simply wants to remember what their temperature was yesterday will find the same features useful with far less ceremony.

The app suits people who would rather not hand their health notes to a service. I would treat the export function as something to use at the end of an illness rather than a step to postpone.

A household logbook rather than a medical tool

Body Temperature Fever Tracker does one job: it keeps a dated record of temperatures, symptoms, medication and contacts, and it flags readings above 37.5 °C. It does that without pretending to be a thermometer or a doctor, and the developer's disclaimers are unusually direct about the line between the two.

The ads and the in-app purchases are the main things I would want a new user to know about before installing, along with the fact that the app is only as useful as the entries you put into it. The 2.5 average rating from over 7,000 people is a reminder that a simple diary still has to earn its place on a phone.

If you already own a thermometer and want one place to keep a family's illness records, with an export you can hand over when needed, this is a sensible thing to try. If you are looking for something that takes a temperature or tells you what a fever means, this app is not built for that.

What's new in version 4.2.4

Bug fixes