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What is the difference between the two apps?
Sync Solver - Fitbit to Health (the red icon, listed in the App Store as Sync Solver for Fitbit) allows you to sync data from your Fitbit account into Apple's Health app. For example, if you have a Fitbit Flex you can send step counts into Health, or if you have a Fitbit Aria scale you can send weight measurements into Health. Read More

Sync Solver - Health to Fitbit (the green icon) allows you to sync data from Apple's Health app into your Fitbit account. For example, if you have an Apple Watch you can send heart rate values into your Fitbit account, or if you track steps with a Misfit you can send steps into your Fitbit account.

Due to the way the Fitbit API works, you cannot merge steps from your third-party step counter and your Fitbit device (See Why does it overwrite the steps on my Fitbit Dashboard?). If you want to sync steps from your iPhone into Fitbit, we recommend that you use Mobile Track (See Why do my steps not count towards challenges?).

Note: For any given data type, you should only sync it in one or the other app, not both. For example, if you have a Withings scale and send weight measurements to Fitbit using Sync Solver - Health to Fitbit, you should not sync weight to Health using Sync Solver - Fitbit to Health, since the weights will already be in Health causing duplicates.
Why does it need read access to the data in Health?
The app must be granted access to read your Health data in order to sync it to your Fitbit account.
Why are my steps not included in the 7-day step total in the Fitbit app?
Fitbit recently changed the Fitbit app (around Dec. 1, 2015) to exclude steps recorded as activities from the 7-day total. Your steps will still show up under the activities list but no longer in the totals. We realize this limits the usefulness of Sync Solver, but it is entirely out of our control and we are asking Fitbit to reverse this decision. This decision is actually just the latest example of Fitbit removing functionality from the API (See Why were Heart Rate and Blood Pressure removed?).
Why are my steps logged as 1-hour activities?
Fitbit only allows third-party apps to record steps as activities at this time.
Why does it overwrite the steps on my Fitbit Dashboard?
Steps are currently recorded as activities (See Why are my steps logged as 1-hour activities?). Furthermore, if you log an activity for a given time period with a certain number of steps, Fitbit will ignore any steps from your actual device (if you have one). If you have a Fitbit device, we do not recommend that you sync steps using this app, as merging is not possible at this time.
Where are my steps in the Fitbit app and Fitbit Dashboard?
Steps are currently recorded as activities (See Why are my steps logged as 1-hour activities?). Open the Fitbit app and tap Track Excecise to see the activities, or login to the Fitbit Dashboard and click Log > Activities ( direct link).
Why do my steps not count towards challenges?
Fitbit has decided to not allow steps from third-party apps to count towards challenges (because they are logged as activities). See the Fitbit Challenges FAQ for more details.
If you want to sync steps from your iPhone into Fitbit, we recommend that you use Mobile Track in order for the challenges to work.
What is the Fitbit rate limit?
Fitbit enforces a strict rate limit in their Public API, which means that the app can only write up to 150 data points per hour. Fitbit offers a Partner API without this restriction, but we have not been granted access to this level of the API yet.
Help us get Partner API access by replying to our Fitbit forum post
Does it sync historical data?
Yes. After selecting sources and performing your first sync, go to Advanced and choose a date that encompasses all the data you want to sync. Then tap Sync History Now and leave your phone on and unlocked. Due to the Fitbit rate limit (See What is the Fitbit rate limit?), this process may take many hours, so we recommend that you leave your phone plugged in. If the history sync is stopped for any reason, go back to Advanced and tap Sync History Now again, and the app will automatically pick up where it left off. Warning: If you delete and reinstall the app, or install the app on a new phone, do not run history sync again as it will create many duplicate data points in your Fitbit account.
Why is it unable to sync all of my data at once?
The app can only sync up to 150 data points per hour, due to the Fitbit rate limit (See What is the Fitbit rate limit?). If you have additional data to sync, you will need to wait an hour before syncing again.
How often does it automatically sync?
By default, the app is set to use the Balanced Background Update Strategy setting. In the best case scenario, this would result in automatic syncing every hour. In real world conditions, it generally results in 2-4 syncs per day. To change the Background Update Strategy, open the iOS Settings app, navigate to Sync Solver > Background Update Strategy, and select either Aggressive or Battery Saver. Aggressive typically results in 4-6 syncs per day, and Battery Saver typically results in 1-2 syncs per day. If you want to know when it automatically syncs without opening the app, open the iOS Settings app, navigate to Sync Solver > Show New Data Badge (or Notification) and turn the switch on.
Why is it not automatically syncing?
In order for the app to automatically sync, your device must be on, unlocked and connected to the internet. Apple considers Health data protected (Learn More) and does not allow Sync Solver access when your device is locked. If you want the app to sync more frequently, open the iOS Settings app, navigate to Sync Solver > Background Update Strategy and choose Aggressive.
Note: Sync Solver uses an iOS feature called Background App Refresh to enable automatic syncing. Since iOS schedules backgroud updates based on your app usage pattern, it may be necessary to manually sync from time to time in order to establish a more consistent Background App Refresh pattern for iOS.
Why does it only sync steps on an hourly basis?
Syncing step data at any finer level of granularity is not possible due to the Fitbit rate limit (See What is the Fitbit rate limit?).
Why were Heart Rate and Blood Pressure removed?
Fitbit has changed their API and removed the Heart Rate and Blood Pressure logging feature. Because of this change, we have had to remove support for these data types from Sync Solver - Health to Fitbit. We are truly sorry to see Fitbit do this, and we hope that they will add the data types in a future update.
Why is it unable to sync Blood Pressure?
Fitbit only allows logging Blood Pressure in accounts created on or before September 28, 2014.
Click here to learn more
Why isn't my latest data syncing to Fitbit?
Sometimes Health needs to be refreshed. Open Health and the data will be updated. Go back to Sync Solver - Health to Fitbit, and try syncing again and it should sync all of the latest data.
Why is my step count not exactly correct?
There are several reasons why the step count reported in Health may not exactly match the step count in Fitbit:
  1. Health aggregates steps from multiple sources, but Sync Solver - Health to Fitbit can only sync steps from a single source. If you have multiple step sources in Health, your Fitbit steps will be off a slight amount from what Health shows you.
  2. Sync Solver - Health to Fitbit cannot merge steps due to Fitbit limitations. Syncing steps with Sync Solver will overwrite any existing step entries, but this is completely out of our control. Fitbit chooses how to integrate step counts over the entire day.
  3. Take a look at this screen shot. Notice that steps from the watch and phone are interleaved (2 step sources). Sync Solver - Health to Fitbit will only sync one source, either the watch or the phone, but not both.
Why does it keep asking me to login to Fitbit?
Fitbit only allows Sync Solver to save your credentials for up to 30 days. You will need to login again when the credentials expire.
Why does it not let me login to Fitbit?
If the browser redirects me back to the login page with no error message when attempting to login to Fitbit, it probably means that you have cookies disabled in Safari. Fitbit requires that you enable cookies in order to login to their website. Open the iOS Settings app, navigate to Safari > Block Cookies and choose one of the Allow options.
What does Health mean in the sources list?
If you see "Health" in the sources list, it represents data that you have manually entered directly into the Health app.
What is are differences between the Health, iPhone, and Apple Watch step data sources, and which one should I select?
The Health step data source stores any steps that you manually enter in to the Health app. The iPhone step data source stores any steps that your iPhone writes to Health. The Apple Watch step data source stores any steps that your Apple Watch writes to Health.

By default, Apple prioritizes the Apple Watch step data source over Health, and Health over iPhone. By doing this, the Health app can reliably account for duplicate step data across the sources, but Fitbit cannot account for this because it does not track step sources for activities. Because of this, Sync Solver - Health to Fitbit only allows you to select one of the sources.

If you would rather log steps from your Apple Watch, select the Apple watch step source. If you woud rather log steps from you iPhone, we recommend that you use Mobile Track in order for the challenges to work (See Why do my steps not count towards challenges?). Only select the Health source if you actually manually enter steps into Health and don't want to use steps from either your Apple Watch or iPhone.
Why does it say "Unable to finish sync, Health unavailable" after I upgrade iOS to a new version?
There is a known issue where Apple Health can become unresponsive after upgrading iOS. In most cases this issue can be corrected by performing a hard restart on the phone (hold the home and power button at the same time).
What types of anonymous usage data do you collect and why?
The primary type of anonymous usage data that we collect is error and diagnostic information, which helps us find and correct issues and improve the stability of the app. We also collect performance information, which helps us determine how to make the app faster and more responsive.

Usage data does not, and will never include identifying information or your Health data. If you want to disable sending anonymous usage data, open the iOS Settings app, navigate to Sync Solver > Send Anonymous Usage Data and turn the switch off.
What is your privacy policy?
Our privacy policy can be found by clicking the link at the bottom of this page.
In short, we do not do anything with your Health data other than upload it to your Fitbit account.
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