Most thyroid apps look alike on the store page. These are the differences that decide whether you still have your data in three years.
This is the first question, not the last one. An app with an account keeps your thyroid history on someone else's server, which means a company failure, a policy change or a breach is a thing that can happen to your medical record. An app that stores on-device cannot lose your data to any of those — but it also cannot get it back for you if you lose the phone without a backup.
Neither answer is wrong. Choosing without knowing which one you picked is.
A typical adult TSH reference range is about 0.4–4.0 mIU/L, but plenty of people on levothyroxine are being steered to a narrower target. An app that colours everything under 4.0 as "normal" is useless to someone told to stay under 2.5. Look for a personal band you can set yourself. More on ranges and why labs disagree.
A TSH value on its own says very little. A TSH value six weeks after a dose went from 75 to 88 micrograms says something. If dose changes are just free text in a notes field, the app cannot line them up against results — and the single most useful view, the trend with changes marked on it, is impossible.
Daily logging is only sustained if it costs seconds. One-tap symptom chips get kept; a form with sliders and a free-text box gets abandoned in a month, and one abandoned month is most of the value gone when the review interval is six.
PDF for the appointment, CSV for yourself. Export is also your exit: an app you can leave is an app you can safely commit to. If there is no export, every entry you make increases the cost of ever switching.
Any app stating a reference range, a retest interval or an absorption rule is making a medical claim. Check whether it says where the claim came from. Named sources — the American Thyroid Association, NIDDK, MedlinePlus — mean someone did the work and you can check it. No sources means you are trusting a developer's memory.
"Fatigue on 19 of the last 30 days, against 8 in the 30 before" is a count you can verify and take to a doctor. A wellness score out of 100, or an AI paragraph about what your labs suggest, is a black box in a domain where the treatment decision is not yours to make. Prefer the count.
Thyrowise is built to a specific shape: private, single-device, one person, sourced, no guessing. That makes it a poor fit for several perfectly reasonable wants.
| Thyrowise does | Thyrowise does not |
|---|---|
| Work with no account and no server, everything on device | Sync automatically across devices — the backup is a JSON file you save and restore yourself |
| Chart TSH against the band your doctor gave you | Offer a patient community or peer support |
| Treat dose changes as dated events on the same timeline | Run on Android — that version is still in progress |
| Count the empty-stomach wait down on the Lock Screen and Watch | Provide meal plans, recipes or supplement programmes |
| Export an endocrinologist-ready PDF and a CSV | Import lab results automatically from a hospital portal |
| Name a published source for every medical statement | Interpret your labs, score you, or suggest a dose |
Listed so this page is useful rather than only promotional. Each description is drawn from the app's own store listing or website; features change, so check before you commit.
Last checked September 2026.
iPhone and Apple Watch · 11 languages · no account, no server