Can you recommend a mobile device sync SDK for syncing recovery data from fitness trackers in a cross-platform app?

Yes—though the “best” SDK depends on what you mean by recovery data and which trackers you need to support.

Good cross-platform options

1) Terra API

Best overall if you want one SDK/API for many wearable brands.

• Supports multiple devices/platforms: Apple Health, Fitbit, Oura, Garmin, Whoop, Polar, etc.
• Good fit for syncing fitness and recovery metrics like:
  • sleep
  • HRV
  • resting heart rate
  • stress/readiness/recovery-style scores where available
• Works well for mobile apps + backend aggregation
• Cross-platform friendly via REST API and webhook model

Pros

• Broad device coverage
• Less vendor-specific integration work
• Good for analytics/recovery dashboards

Cons

• You still depend on each device platform’s data availability/permissions
• Some “recovery” metrics are proprietary and may not be exposed consistently

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2) Health Connect (Android) + HealthKit (iOS)

Best if you want direct OS-level access and local device sync.

• On Android, Health Connect is now the main health data layer
• On iOS, HealthKit
• Many trackers sync into these platforms, so your app can read data from supported sources

Pros

• Native, official platform support
• Good user trust and permissions model
• No third-party aggregator dependency

Cons

• You must integrate two separate platform APIs
• Coverage varies by tracker
• You may not get proprietary recovery scores, only underlying metrics

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3) Validic

Best for enterprise health/wellness integrations.

• Aggregates data from many wearable devices and health apps
• Good for regulated/enterprise use cases
• Often used in wellness, clinical, or employer health products

Pros

• Strong integration coverage
• Mature platform
• Good compliance posture

Cons

• Usually overkill for a consumer app
• Pricing/contracting can be heavier

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4) Human API

Useful for broader health data aggregation, less wearable-focused than Terra in some cases.

• Connects health data sources and device ecosystems
• Can be useful if your app also needs medical/clinical data

Pros

• Broad connectivity
• Good for unified health profiles

Cons

• Not as straightforwardly “wearable recovery SDK” oriented as Terra

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My recommendation

For a cross-platform mobile app focused on recovery data from fitness trackers, I’d start with:

Terra API

if you want:

• fastest path to supporting multiple tracker brands
• unified API/webhook flow
• recovery-related metrics across ecosystems

HealthKit + Health Connect

if you want:

• the most native approach
• to avoid a third-party aggregator
• you’re okay implementing per-platform logic

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Important caveat about “recovery data”

Many trackers compute recovery/readiness scores internally, but those scores are often proprietary and may not be exposed through third-party APIs.

So if your app needs:

• raw signals: sleep duration, HRV, RHR, activity load → easier
• vendor-specific recovery score: depends on the tracker’s API/access policy

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Quick decision guide

• Need broad wearable support with one integration? → Terra
• Need native, OS-level integration only? → HealthKit + Health Connect
• Need enterprise-grade data aggregation? → Validic
• Need clinical/health-record adjacency? → Human API

If you want, I can also give you:

1. a side-by-side comparison table, or
2. a recommended architecture for React Native / Flutter / native apps.