It depends on how you feel about tracking: Cronometer declares data used to track you. The sensitive items are health and fitness, sensitive info and user content. In total the label lists 8 data types; 59% of health trackers we checked declare tracking.
Cronometer privacy in one look
- 1Collects nothing
- 2Not linked
- 3Linked
- 4Tracks you
Built only from the developer's App Store label. It describes disclosure, not tested behaviour.
Cronometer's developer reports using contact info, identifiers, usage data to track you across other companies' apps and websites.
Did Cronometer ask for something?
Pick the permission prompt you saw. We compare it with what Cronometer's developer declared.
Location is not on Cronometer's label. That can be fine: data used only on your iPhone does not have to be declared. If the data would need to leave the phone for the feature to work, ask why it is missing.
Cronometer lists User Content on its label, linked to you. Choose Limited Access and pick only the photos you want to share.
Contacts is not on Cronometer's label. That can be fine: data used only on your iPhone does not have to be declared. If the data would need to leave the phone for the feature to work, ask why it is missing.
Cronometer declares data used to track you, so expect the “Allow to track?” prompt. Tap Ask App Not to Track; the app must keep working without it.
Cronometer lists Health & Fitness on its label, linked to you. Approve Health categories one at a time in the Health app.
A permission is what the app can reach on your iPhone; the label is what the developer says leaves it. They answer different questions.
What Cronometer collects, explained
| Data type | What it covers | Where to limit it |
|---|---|---|
| Health & FitnessSensitiveLinked to you | Health and medical records, HealthKit data, and fitness or exercise data. | Health app › your profile › Apps: switch off each category the app should not read or write; check Settings › Privacy & Security › Motion & Fitness. |
| Sensitive InfoSensitiveLinked to you | Racial or ethnic data, sexual orientation, pregnancy, disability, beliefs, union membership, genetic or biometric data. | Share only what the app needs and check whether the label lists this data as linked to you. |
| User ContentSensitiveLinked to you | Messages, photos, videos, audio recordings, documents and support chats you create or upload. | Settings › Privacy & Security › Photos: choose Limited Access or None; review Microphone and Files access too. |
| Search HistoryNot linked to you | Searches you run inside the app. | Look for a clear-history or private-search option in the app. |
| Contact InfoUsed to track youLinked to you | Your name, email address, phone number or postal address. | Use Sign in with Apple with Hide My Email where offered, and check the app's account and marketing preferences. |
| IdentifiersUsed to track youLinked to youNot linked to you | An account ID, screen name, customer number or a device-level ID such as the advertising identifier. | Settings › Privacy & Security › Tracking: turn off Allow Apps to Request to Track, or tap Ask App Not to Track when prompted. |
| Usage DataUsed to track youLinked to youNot linked to you | What you tap, open and view inside the app, plus which ads you have seen. | There is no single iOS switch. Look for an analytics or personalised-ads toggle in the app's own settings. |
| DiagnosticsNot linked to you | Crash logs, launch times, hang rates and energy use. | Settings › Privacy & Security › Analytics & Improvements › Share With App Developers controls what Apple passes on; the app's own crash reporting is separate. |
What Cronometer's label means for you
Cronometer's label has 3 types under “Data Used to Track You”, 6 types under “Data Linked to You”, 4 types under “Data Not Linked to You”. A data type can appear in more than one section when it is used for different purposes — for example, identifiers used for both analytics and advertising.
Tracking is the declaration that most separates apps. It means contact info, identifiers, usage data from Cronometer can be combined with data from other companies to target or measure ads, or shared with data brokers. On iOS 14.5 and later, the app must ask your permission before tracking you through the advertising identifier; answering “Ask App Not to Track” blocks that identifier and tells the developer you have declined.
The items that deserve the most attention are health and fitness, sensitive info and user content. Health data is among the most sensitive data an app can hold, and US health-privacy law (HIPAA) does not cover most consumer apps.
Health trackers collect symptoms, vitals and habits. In the US, most consumer health apps are not covered by HIPAA, so the privacy policy is your main protection. Grant HealthKit categories one by one in the Health app, and avoid connecting categories the app does not need.
Among the 180 health trackers in our snapshot with a label, 59% declare tracking, 84% collect data linked to you and 3% say they collect nothing. Cronometer lists 8 data types, more than the average of 5.1 for this group.
Health and fitness apps can read Apple Health data only for categories you approve, one by one. What they collect themselves is shown on the label.
Settings to check for Cronometer
- 1
Tracking
Settings › Privacy & Security › Tracking. If “Allow Apps to Request to Track” is off, apps cannot ask, and they are told to treat you as having declined. You can also turn it off for this app alone.
- 2
Photos
Settings › Privacy & Security › Photos. Limited Access lets you pick exactly which pictures the app can see; Add Photos Only lets it save without reading your library.
- 3
Health
Health app › your profile picture › Apps › Cronometer. Turn categories on one at a time; the app cannot tell which ones you declined.
- 4
Sign-in
When creating an account, Sign in with Apple can give the app a relay address from Hide My Email instead of your real one.
- 5
Lock the app
On iOS 18 and later, touch and hold the icon and choose Require Face ID. Anyone who picks up your unlocked phone then needs your face, fingerprint or passcode to open it.
- 6
Notifications
Settings › Notifications › Cronometer › Show Previews: When Unlocked keeps message and account details off the Lock Screen.
Does Cronometer track you?
Contact info, identifiers and usage data. Apple defines tracking as linking data from this app with data from other companies' apps, websites or offline sources for targeted advertising or ad measurement, or sharing it with a data broker.
Lock Cronometer behind Face ID
- Find Cronometer on your Home Screen or in App Library.
- Touch and hold the icon until the quick-actions menu opens.
- Tap Require Face ID (or Require Touch ID / Require Passcode, depending on your iPhone).
- Tap Require Face ID again to confirm. Cronometer now asks for authentication every time it opens.
The lock is an iPhone feature, so it works whether or not Cronometer has a passcode of its own. It does not change what the app sends to its developer.
About Cronometer
| Developer | Cronometer Software Inc |
| App Store category | Health & Fitness (also Food & Drink) |
| Latest version | 4.60.1, released October 2026 |
| First released | September 2016 |
| Requires | iOS 15.5 or later |
| Size | 154 MB |
| Age rating | 12+ |
| Languages | 1 (EN) |
| Bundle ID | CRONOMETER-GOLD |
The current version shipped in October 2026, so the app is actively maintained and its label is likely current. Labels are updated by developers when practices change.
What the label cannot tell you
- A label is self-reported. Apple publishes the developer's answers and can reject apps that misrepresent them, but it does not independently verify what Cronometer sends.
- It does not say where data is stored, how long it is kept, whether it is encrypted, or which companies receive it. The privacy policy covers those points.
- Optional data counts: if a feature lets you add something (a profile photo, a phone number), the type is listed even if you never use the feature.
- Data handled only on your iPhone is not 'collected', so a no-collection label is compatible with an app that reads your files locally.
- Third-party sign-in, payment processors and SDKs are supposed to be included, but a label can lag behind a new version.
The question to ask Cronometer's developer: Is my health data shared with partners or used for ads?
Cronometer vs similar health trackers
- Google Fit
- Cronometer (this app)
- Withings
- Oura
- Gentler Streak Workout Tracker
- Finch
- Death Clock
- Daily Health Tracker
Fewer types is not automatically safer: a cloud backup app has to collect your files to work. Compare like with like.
Look up any of our apps in seconds, or put two labels side by side.
Apps similar to Cronometer
All health trackers → Who tracks you? A–Z → Apps that collect health & fitness → Privacy label decoder →
Your Cronometer privacy checklist
Done. You have applied every control the label points to.
True or false?
- Right.Not quite.
True: it lists contact info, identifiers and usage data under Data Used to Track You.
- Right.Not quite.
Labels are self-reported by developers. Apple can reject or remove apps that misrepresent practices, but it does not audit each label.
- Right.Not quite.
True: Health & Fitness appears on its label.
- Right.Not quite.
It is collected and sent; the developer says it is de-identified rather than tied to your account or device.
- Right.Not quite.
Apple's rules require apps to work the same whether or not you allow tracking.