LodestarIf an app that used to read your Fitbit data suddenly shows old numbers, won't sync or keeps asking you to sign in, the cause is probably not your tracker. The way outside apps get Fitbit data is changing.
What changed
For years, apps outside Fitbit read your data through the Fitbit Web API. Google is replacing it with the Google Health API. On Google's developer timeline, support for the old Fitbit Web API ended on September 30, 2026, and the old API is being switched off around the start of November 2026. After that, apps still using it can't get new data at all.
Sign-in is changing too. The old connection used a Fitbit login. The new one goes through your Google Account, so an app that has moved over will show you a Google sign-in screen and ask for your permission again. Your old connection doesn't carry across on its own.
What it looks like when an app hasn't moved yet
- Your latest nights or workouts don't show up, while older data is still there.
- The app says it can't connect, or asks you to log in to Fitbit again and then fails.
- Numbers stop updating after a certain date and stay frozen.
Your Fitbit itself keeps recording as normal, and your data is still in your account. The app just can't reach it through the old route.
What you can do
- Update the app. Look for a recent update that mentions Google Health or a new way of connecting Fitbit.
- Reconnect when asked. If the app has moved over, it will ask you to sign in with Google and approve access. Read what it asks for: a well-built app only asks for the data it uses, and read-only access where it can.
- Check the developer's notes. Many apps post a message on their website or in the app about the change.
- Remove old connections. You can review which apps have access to your Google Account at myaccount.google.com/permissions and remove anything you no longer use.
- Try another app if yours has gone quiet and hasn't said anything about the switch.
Questions to ask any app that reads your Fitbit data
A change like this is a good moment to check what you've connected. Some useful questions: Does the app need write access, or only read? Does it send your data to its own servers, and if so, what does it do with it? Can you delete everything it holds? Our guide to seeing your Fitbit data in more detail on iPhone goes through this in more depth.
How Lodestar fits in
Lodestar is an iPhone app built on the Google Health API from the start, so the switch doesn't affect it. You sign in with Google once and give it read-only access to your Fitbit data. It works out daily Sleep, Recovery, Effort, Stress and Energy scores on your phone, against your own baseline, and nothing is sent to us.
If an app you relied on for HRV or recovery scores has stopped working, Lodestar is free to try in beta.