Your Fitbit app may have stopped working because of a connection issue, an outdated app version, a problem with your Fitbit account, or a change in how Fitbit syncs with your phone

The most common reason is that your phone lost its connection to your Fitbit device or your Fitbit account. This happens when Bluetooth turns off, your phone moves out of range, or the app hasn't synced in a while. Less often, Fitbit updates the app or changes how it works, and an older version on your phone stops communicating with Fitbit's servers. You can usually fix this yourself in a few minutes by restarting the app, checking your Bluetooth connection, or reinstalling the app entirely.

If you see an error message, write it down — it will help you narrow down what went wrong. If the app straightforward won't open or shows no data, start with the steps below in order, because each one fixes a different problem.

Key Takeaways

  • Restart your phone and turn Bluetooth off and back on, because most app failures are connection problems, not app problems.
  • Check that you are signed into the Fitbit app with the same account you use on the Fitbit website, because a mismatched account will show no data.
  • Uninstall and reinstall the Fitbit app from your phone's app store, because this fixes corrupted app files that a straightforward restart cannot repair.
  • If the app still will not work after these steps, contact Fitbit support directly, because some problems require account-level fixes only Fitbit can make.

Restart Your Phone and Check Your Bluetooth Connection

Before you do anything else, restart your phone completely. Power it off, wait 10 seconds, and turn it back on. This clears temporary glitches that prevent the Fitbit app from talking to your device.

Once your phone is back on, open your phone's settings and check that Bluetooth is turned on. If it is already on, turn it off, wait 5 seconds, and turn it back on. This forces your phone to reconnect to your Fitbit device. Open the Fitbit app and wait 30 seconds to see if your data appears. If you see your steps, heart rate, or sleep data, the problem is solved.

If the app still shows no data, make sure your Fitbit device itself is charged and nearby. Hold your phone within a few feet of your Fitbit and try again. If your Fitbit's battery is very low, charge it for at least 15 minutes before opening the app.

Sign Out and Back Into Your Fitbit Account

Open the Fitbit app and look for the account or profile icon, usually in the bottom right corner. Tap it and look for a "Sign Out" or "Log Out" option. Sign out completely.

Now sign back in using the same email address and password you use on the Fitbit website. If you are not sure which email you used, go to the Fitbit website on your computer or another phone and log in there first. Once you know the correct email, use that same one in the app.

After you sign back in, wait a full minute for the app to sync with Fitbit's servers. Your data should reappear. If it does not, move to the next step.

Uninstall and Reinstall the Fitbit App

Uninstalling and reinstalling the app clears out corrupted files that a straightforward restart cannot fix. On an iPhone, press and hold the Fitbit app icon on your home screen, tap "Remove App," then "Delete App." On an Android phone, go to Settings, find Apps or process Manager, tap Fitbit, and tap "Uninstall."

Once the app is completely removed, open your phone's app store. On iPhone, open the App Store; on Android, open Google Play. Search for "Fitbit" and install the official Fitbit app made by Google (Fitbit is now owned by Google). Do not install a third-party app with a similar name.

After installation finishes, open the app and sign in with your email and password. Wait a minute for the app to sync. Your device and data should now appear.

Check for App Updates in Your App Store

If you reinstalled the app and it still does not work, check whether an update is available. Open your app store, search for Fitbit, and look for an "Update" button. If one appears, tap it and wait for the update to finish.

Fitbit releases updates regularly to fix bugs and add features. An outdated version can lose the ability to sync with newer Fitbit devices or with Fitbit's servers. After the update installs, open the app and wait 30 seconds for it to sync.

Verify Your Fitbit Device Is Paired Correctly

In the Fitbit app, go to your profile or account settings and look for a section called "Devices" or "My Devices." You should see your Fitbit device listed there with a green dot or a "Connected" label next to it. If your device is not listed, or if it shows as disconnected, you need to pair it again.

To pair your device, look for an option to "Add Device" or "Set Up Device" in the app. Follow the on-screen steps. Your phone will search for your Fitbit device via Bluetooth. When it finds it, tap to connect. This process usually takes a minute or two.

If your device does not appear when the app searches for it, make sure your Fitbit is charged, nearby, and not already paired to another phone or account. If you recently switched phones, you may need to unpair your Fitbit from your old phone first before pairing it to your new one.

Contact Fitbit Support If the App Still Will Not Work

If you have restarted your phone, checked your Bluetooth connection, signed out and back in, reinstalled the app, and verified your device is paired, and the app still will not work, the problem is likely with your Fitbit account or device itself. This is the point to reach out to Fitbit support.

Go to support.google.com/fitbit (Fitbit support is now handled by Google) and look for a "Contact Us" option. You can chat with a support agent, send an email, or call. Have your Fitbit device model number and your account email ready. Fitbit support can check whether your account has a technical issue, whether your device needs to be replaced, or whether there is a known problem affecting your model.

Frequently Asked Questions

Why does my Fitbit app say "Sync Failed"?

A sync failure usually means your phone cannot reach Fitbit's servers. Check that you have an internet connection (WiFi or mobile data), restart your phone, and try again. If the error persists, sign out of the app, restart your phone, and sign back in. If it still fails, uninstall and reinstall the app.

Can I use my Fitbit without the app?

You can see your data on your Fitbit device itself — steps, heart rate, and sleep appear on the screen. However, you cannot sync that data to the Fitbit website or see detailed charts and history without the app. The app is required to back up your data and use features like challenges or integrations with other health apps.

What if I forgot my Fitbit password?

Go to the Fitbit login page on the web and click "Forgot your password?" Enter your email address and Fitbit will send you a link to reset it. Once you create a new password, use that password to sign back into the app on your phone.

Does the Fitbit app work on all phones?

The Fitbit app works on iPhones running iOS 14 or newer and Android phones running Android 8 or newer. If your phone is older than that, it may not support the current version of the app. Check your phone's settings to see what version of iOS or Android you have, and update it if possible.

Will my Fitbit data be lost if I uninstall the app?

No. Your data is stored on Fitbit's servers, not on your phone. When you reinstall the app and sign back in with your account, all your historical data will reappear. Uninstalling the app is safe and will not delete anything.