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Answers to common questions about setting up Krissi, connecting your wearable, and getting the most out of your health data.
Health Connect is how Krissi reads data from your wearable. It's an Android system app that acts as a central hub - your Fitbit, Samsung Health, Garmin, or other apps write data to Health Connect, and Krissi reads it from there.
On Android 14 and later, Health Connect is built into your phone - no installation needed. You'll find it at Settings → Apps → Health Connect.
On Android 9-13, you may need to install the Health Connect app from the Google Play Store first. Search for "Health Connect by Google" and install it before opening Krissi.
When you first open Krissi, it will ask for Health Connect permissions. Tap "Allow all" to let Krissi read your health data.
If the prompt didn't appear, or you dismissed it, you can grant access manually:
Apple Health is how Krissi reads data from your wearable on iOS. Your Apple Watch, Fitbit, Garmin, or other apps write data to Apple Health, and Krissi reads it from there.
When you first open Krissi, it will ask for Apple Health permissions. You'll see a list of data types - toggle on the ones you want to share with Krissi and tap "Allow".
Apple Health asks you to grant each data type individually (heart rate, steps, sleep, etc.) rather than all at once.
If the prompt didn't appear, or you want to change your selections later:
Getting wearable data into Krissi is a two-part process: your wearable app needs to be writing data to Health Connect, and Krissi needs permission to read it. Many newer wearables sync to Health Connect automatically - so start by checking whether your data is already there.
Open Settings → Apps → Health Connect → Data and access on your phone. If you can see your wearable data (steps, heart rate, sleep, etc.) listed there, your wearable is already connected - you just need to grant Krissi read access.
To do that:
Open Krissi and your wearable data should appear within a few minutes.
If Health Connect doesn't show any data from your wearable, you'll need to enable the connection inside your wearable's companion app. The steps vary by manufacturer:
After this, Fitbit will automatically write your health data to Health Connect, and Krissi will pick it up.
The process is similar for most wearable apps - look for a Health Connect option in the app's settings or connected services section. If you can't find it, check your wearable manufacturer's support site to confirm Health Connect compatibility.
If you use an Apple Watch, your health data flows into Apple Health automatically - no setup needed. For third-party wearables, you'll need to make sure their companion app is connected to Apple Health.
Apple Watch writes health data to Apple Health automatically. As long as your Apple Watch is paired with your iPhone, your data (heart rate, steps, sleep, workouts, etc.) will be available to Krissi through Apple Health.
Just make sure Krissi has permission to read the data types you want:
Third-party wearable apps need to be connected to Apple Health to share data. This is done inside the wearable's companion app:
You can verify the connection is working by opening the Health app on your iPhone and checking whether your wearable data appears there.
Open the Health app on your iPhone and browse the Summary or individual data categories (Heart, Sleep, Activity, etc.). If your wearable data is already appearing there, you just need to grant Krissi read access in Settings → Health → Data Access & Devices → Krissi.
If you've connected Health Connect but don't see your wearable data in Krissi, work through these checks in order.
Krissi can only read data that your wearable app has already written to Health Connect. Open Health Connect on your phone (Settings → Apps → Health Connect → Data and access) and check whether your wearable data appears there.
If the data is missing from Health Connect itself, the issue is between your wearable app and Health Connect - not Krissi.
Go to Settings → Apps → Health Connect → App permissions → Krissi and make sure all data types are toggled on.
If data is appearing in Health Connect but not in Krissi, try revoking and re-granting permissions:
If your wearable data isn't appearing in Krissi, work through these checks in order.
Open the Health app on your iPhone and look for your wearable data. Tap into categories like Heart, Sleep, or Activity to see if your wearable is recording data there.
If the data is missing from Apple Health itself, the issue is between your wearable app and Apple Health - not Krissi.
Go to Settings → Health → Data Access & Devices → Krissi and make sure the data types you want are toggled on. Apple Health requires each type to be granted individually.
If data is in Apple Health but not showing in Krissi, try revoking and re-granting:
Sometimes most data syncs fine but one or two types are missing. This is usually a wearable-app issue, not a Krissi bug - Krissi reads whatever your wearable writes to Health Connect.
This is a known issue with Fitbit's Health Connect integration that has affected users intermittently since 2025. Fitbit sometimes stops writing certain data types (heart rate, exercise, resting heart rate) to Health Connect after app updates or device changes.
What to try:
If the issue persists after this, it's a Fitbit-side bug that typically gets patched in subsequent Fitbit app updates. Krissi will display the data as soon as it appears in Health Connect.
Make sure your wearable is set to track sleep automatically in your wearable's app settings. Some wearables require you to enable sleep tracking separately from other health metrics.
Also check that your wearable app has the Sleep permission enabled in Health Connect (Settings → Apps → Health Connect → App permissions → [your wearable app]).
Not all wearables measure every data type. Body temperature and blood oxygen (SpO₂) require specific hardware sensors - check your wearable's documentation to see which health metrics it supports.
Even wearables that do measure these may not write them to Health Connect - some manufacturers only sync core metrics like heart rate, steps, and sleep.
Sometimes most data syncs fine but one or two types are missing. This is usually a wearable-app issue, not a Krissi bug - Krissi reads whatever your wearable writes to Apple Health.
First, check whether the data is appearing in the Apple Health app itself. Open Health → Heart and see if your wearable's readings are listed.
If the data is in Apple Health but not in Krissi, make sure the Heart Rate and Heart Rate Variability permissions are both toggled on for Krissi in Settings → Health → Data Access & Devices → Krissi.
For third-party wearables (Fitbit, Garmin, etc.), also check that the wearable app has permission to write heart data to Apple Health.
Apple Health tracks sleep data from Apple Watch automatically if you have Sleep Focus or Sleep Schedule enabled. For third-party wearables, check that the wearable app has Apple Health sleep permissions enabled.
Also verify that Krissi has the Sleep Analysis permission toggled on in Settings → Health → Data Access & Devices → Krissi.
Not all wearables measure every data type. Body temperature and blood oxygen (SpO₂) require specific hardware sensors - check your wearable's documentation to see which metrics it supports.
Apple Watch measures SpO₂ (Series 6 and later) and wrist temperature (Series 8 and later). These should sync to Apple Health automatically if the features are enabled in the Watch app.
Whoop tracks a wide range of health data (HRV, respiratory rate, skin temperature, SpO₂, and more), but does not write all of it to Apple Health. This is a known limitation of the Whoop app - it only syncs a subset of its data, typically heart rate, workouts, and sleep.
This isn't a Krissi bug. Krissi will read and use whatever Whoop makes available through Apple Health, but some metrics may only be viewable inside the Whoop app itself. You can check what Whoop is sharing by going to Settings → Health → Data Access & Devices → Whoop on your iPhone.
We're actively working on a way to pull data directly from Whoop and other wearables that don't sync everything to Apple Health, so Krissi can access the full picture. Stay tuned.
When you grant Krissi access to Health Connect, it can read:
Krissi only reads data - it never writes to Health Connect. You can revoke any individual data type at any time through Settings → Apps → Health Connect → App permissions → Krissi.
Yes. In Settings → Apps → Health Connect → App permissions → Krissi, each data type has its own toggle. Turn off any type you don't want Krissi to access.
Keep in mind that the more data Krissi has, the better its pattern analysis will be - but the choice is always yours.
When you grant Krissi access to Apple Health, it can read:
Krissi only reads data - it never writes to Apple Health. You can revoke any individual data type at any time through Settings → Health → Data Access & Devices → Krissi.
Yes. In Settings → Health → Data Access & Devices → Krissi, each data type has its own toggle. Turn off any type you don't want Krissi to access.
Keep in mind that the more data Krissi has, the better its pattern analysis will be - but the choice is always yours.
Apple Health separates permissions into Read (the app can see your data) and Write (the app can add data). Krissi only needs Read access - it never writes data to Apple Health.
In practice, most food-tracking apps do not reliably write nutrition data to Health Connect. This is a platform-wide limitation - Health Connect supports nutrition data, but the apps that could write it (MyFitnessPal, Cronometer, etc.) often don't do so consistently.
This isn't a Krissi bug. If nutrition data does appear in Health Connect, Krissi will read and use it. But for the most reliable food tracking, log your meals directly in Krissi using voice, photo, or manual entry.
Some food-tracking apps can write nutrition data to Apple Health, but many don't do so consistently. If your food-tracking app supports Apple Health integration, make sure it's enabled in that app's settings and that Krissi has Dietary Energy and Nutrients read permissions in Apple Health.
For the most reliable food tracking, log your meals directly in Krissi using voice, photo, or manual entry.
All your data - everything you log and everything Krissi reads from Health Connect - is stored locally on your device. There is no Krissi account, no cloud sync, and no Foddies database holding your records.
The only exception is Krissi's optional AI features (voice logging, photo logging, and the Krissi assistant). When you use these, a summary of relevant data is sent to Anthropic's servers to generate your response - it is not retained or used for training.
Uninstalling Krissi permanently deletes all your logged data. Because everything lives on your device, there is no backup on our end to restore from. Your wearable data in Health Connect is not affected - that's managed separately by your wearable app.
Go to Settings → Apps → Krissi → Storage → Clear data. This removes all logged data and resets the app to its first-launch state.
Krissi's voice and photo meal logging features require:
All your data - everything you log and everything Krissi reads from Apple Health - is stored locally on your device. There is no Krissi account, no cloud sync, and no Foddies database holding your records.
The only exception is Krissi's optional AI features (voice logging, photo logging, and the Krissi assistant). When you use these, a summary of relevant data is sent to Anthropic's servers to generate your response - it is not retained or used for training.
Deleting Krissi permanently removes all your logged data. Because everything lives on your device, there is no backup on our end to restore from. Your health data in Apple Health is not affected - that's managed separately by iOS.
On iOS, you can reset Krissi by deleting and reinstalling the app from the App Store. There is no separate "clear data" option - deleting the app removes all locally stored data.
Krissi's voice and photo meal logging features require:
Have a question, need help, or want to share feedback? Join us on Reddit - it's the fastest way to get answers, see what others are asking, and connect directly with the team behind Krissi.
Prefer email? Reach us at hello@krissi.app with a description of the issue and your device model, and we'll get back to you as quickly as we can.