Key Takeaways
- Fitbit's shutdown is a data-source decision for developers, not a device decision for consumers. Most published "Fitbit alternative" guides compare wrist hardware and miss this entirely.
- Check what your integration actually pulled from Fitbit before searching for a replacement. Most third-party platforms only reliably shipped workouts and activity data against Fitbit's API.
- Since Google owns Fitbit, the Google Health API is the most direct successor for existing Fitbit users: same underlying accounts, no new device required, but with OAuth verification and CASA requirements at scale.
- Beyond that, alternatives split into cloud OAuth providers (Garmin, Whoop, Oura, Polar, Strava, Ultrahuman) and on-device SDK providers (Apple Health, Google Health Connect, Samsung Health), each with different integration models.
- The real decision is single-provider integration versus a unified API layer across several providers, since most health products end up supporting more than one device over time.
Search "Fitbit alternative" and you get smartwatch buying guides. Which watch has the best battery life, which one tracks sleep most accurately, which is cheapest. That is a reasonable question if you are a consumer replacing a device on your wrist.
It is the wrong question if you are the team that built a product on top of Fitbit's Web API and just learned it shuts down in September 2026. Your users are not choosing a new watch. You are choosing a new data source, and that is a different decision with different criteria: API stability, data coverage, OAuth maturity, and whether the provider is investing in its developer platform or quietly running it down the way Fitbit has been.
Here is that decision, framed for the team making it rather than the person wearing the device.
Start With What You Actually Need
Check what your specific integration actually pulled from Fitbit, rather than assuming. If you built directly against Fitbit's raw Web API, you may have wired up sleep or intraday heart rate yourself. If you went through a third-party wearable data platform, workouts and activity data (type, duration, calories, distance, average heart rate) is the coverage most of them shipped, since that was the reliably available surface. If that's genuinely all your product used, your replacement search is narrower than it might feel. If you were also hoping to eventually add sleep or continuous heart rate and were blocked by your platform's frozen feature set on Fitbit specifically, this is also a chance to pick a provider that actually has that data live today, rather than inheriting the same gap under a different vendor.
The Direct Successor: Google Health API
Since Google owns Fitbit, the most direct replacement for users who already have a Fitbit account is the Google Health API. It is not a different wearable, it is Google's cloud REST API that aggregates Fitbit, Pixel, and other connected sources under one OAuth connection. Your existing Fitbit users do not need a new device; their existing data keeps flowing, just through a different endpoint.
The trade-off is process, not data availability: Google Health API scopes are largely restricted, which means OAuth app verification and, past 100 users, an annual CASA security assessment. That is a real cost and timeline to plan for, not a blocker, but it belongs in your evaluation alongside the technical fit.
If You're Open to Diversifying Beyond Fitbit's User Base
For teams building fitness or wellness products rather than servicing an existing Fitbit user base specifically, the practical alternatives split into two categories.
Cloud OAuth providers, similar in architecture to Fitbit's old model: Garmin (broad activity, HRV, sleep, stress, body battery, VO2 max), Whoop (recovery, strain, sleep performance, HRV, resting heart rate), Oura (sleep score, readiness, HRV, body temperature deviation, SpO2), Polar (training load, Nightly Recharge, VO2 max), Strava (activity-focused, strong on GPS and social workout data), and Ultrahuman (recovery, sleep, HRV, skin temperature). Each requires its own developer credentials and has its own OAuth quirks, rate limits, and data model.
On-device SDK providers, a structurally different approach: Apple Health and Google Health Connect (Google's current Android health data platform, which has replaced the older, now-deprecated Google Fit API) read data that is already aggregated on the user's phone from whichever apps and devices they have connected, without a cloud OAuth flow. Samsung Health follows the same on-device model. Coverage often broadly overlaps or exceeds a single cloud provider, since the phone is aggregating multiple sources already, but you need a mobile app under your brand for the SDK to run in, and app store review is part of the timeline.
The Real Decision Isn't "Which Wearable"
The question a team should actually be answering is: single-provider deep integration, or unified access across several. If your product only ever needs one data source, integrate directly against whichever provider's API and coverage best fits, and accept that you now own OAuth maintenance, rate limit handling, and schema changes for that one vendor indefinitely.
If your roadmap realistically involves supporting more than one provider, which most consumer or clinical health products eventually do once they scale past an early user base with one device preference, a unified API layer that normalizes Garmin, Oura, Whoop, Google Health API, and the rest to one schema removes the compounding maintenance cost of running N separate integrations, each drifting on its own schedule.
That is also the more resilient posture against exactly the situation you are in right now. Fitbit's shutdown is not a one-off; provider APIs get deprecated, acquired, and restructured on a longer timeline than most product roadmaps plan for. An abstraction that lets you swap or add a provider without rewriting your data model is worth more the second time this happens, and there will be a second time.
See the full list of supported providers and how they compare if you are mapping out which combination fits your existing user base and data requirements. For users specifically migrating off Fitbit's old API, the Google Health API path is worth evaluating first, since it keeps existing Fitbit-linked accounts intact.
See related articles
Fitbit Web API Shutdown 2026: Migration Guide
Google Health API and Google Health Connect: What's the Difference
Google Health API: A Practical Guide to Getting Started
Google CASA and OAuth Verification for Health Apps
FAQ
What is the best Fitbit alternative for developers?
It depends on whether you are servicing existing Fitbit users or building fresh. For existing Fitbit users, the Google Health API keeps their data flowing without requiring a new device, since Google owns Fitbit. For new products, Garmin, Whoop, and Oura are the closest matches in data depth to what Fitbit offered through its API.
Do I need a new device if my users have Fitbits?
No. Since Fitbit is owned by Google, existing Fitbit accounts connect through the Google Health API without users needing to buy new hardware. Their historical and ongoing data keeps flowing through a different endpoint.
What data did most Fitbit integrations actually support?
Workouts and activity data (type, duration, calories, distance, average heart rate) is what most third-party platforms reliably shipped against Fitbit's API. Sleep and intraday heart rate were technically available but were not commonly built out, so check your specific integration's coverage before assuming.
Should I integrate with one provider or several?
If your product only ever needs one data source, a direct integration is simpler to start with. If your roadmap will likely support more than one provider, which most health products eventually do, a unified API layer avoids maintaining separate OAuth flows, rate limits, and schemas per vendor.
What is the difference between cloud OAuth and on-device SDK providers?
Cloud OAuth providers (Garmin, Whoop, Oura, Polar, Strava, Ultrahuman) authenticate through a web-based flow and sync data to your backend. On-device SDK providers (Apple Health, Google Health Connect, Samsung Health) require a mobile app under your brand and read data that is already aggregated on the user's phone.