Stridee

Developers building fitness applications face a fragmented nightmare when it comes to wearable data integration. Every major device manufacturer maintains its own API with different authentication flows, data formats, rate limits, and undocumented quirks that surface only during production usage. Connecting a single fitness app to Garmin, COROS, Polar, Wahoo, Apple Watch, and Strava means integrating six separate systems, each with its own maintenance burden and breaking changes that arrive without warning. Stridee solves this by providing a unified API that normalizes fitness data from all major wearable platforms into a single standardized format, letting developers focus on building features that differentiate their products rather than wrestling with vendor-specific implementation details.

The platform handles data reading by converting activity information from any supported device into canonical FIT file format. Whether an athlete logs a run on a Garmin Forerunner, tracks a cycling session on a Wahoo ELEMNT, swims laps with an Apple Watch, or syncs a trail run from a COROS VERTIX, Stridee delivers the same structured output to your application. Heart rate data, GPS coordinates with elevation, pace metrics, power measurements, and cadence information all arrive in consistent formats that your parsing code handles once rather than requiring conditional branches for every manufacturer's interpretation of fitness data standards. This normalization eliminates the constant edge-case handling that plagues multi-platform fitness apps.

Beyond reading data, Stridee supports workout writing, enabling developers to push structured training sessions directly to athletes' watches. This bidirectional capability distinguishes Stridee from simple data aggregators that only pull information. The platform encodes workout definitions into each vendor's native format, preserving pace targets, power zones, heart rate thresholds, and interval structures across different device ecosystems. A coaching app can define a complex interval session once in Stridee's format, then deliver it to any supported watch without building brand-specific encoding logic that requires deep knowledge of each manufacturer's proprietary workout file formats.

The webhook system reflects production-grade engineering decisions that matter for reliability at scale. Events use Ed25519 signatures verified against published keys, eliminating shared secrets that create security vulnerabilities when rotated or leaked. The platform stores all webhook events and supports replay functionality, meaning developers can recover from downstream outages without permanently losing activity data. A 72-hour retry window with exponential backoff ensures that temporary service disruptions do not result in permanent data gaps that frustrate users and undermine trust in your application.

Current device support covers the major endurance sports ecosystem comprehensively. Garmin's full range from Forerunner through Fenix to Edge cycling computers receives support. COROS PACE, APEX, and VERTIX lines cover trail and ultramarathon athletes. Apple Watch with HealthKit integration brings the iOS user base into scope. Wahoo cycling and running devices including ELEMNT computers and KICKR trainers connect seamlessly. Polar Vantage, Grit X, and Pacer series round out dedicated sports watches. Full history import from Strava means athletes with years of training data do not start fresh. The roadmap includes Suunto, Whoop, Oura, Fitbit, Google Health Connect, Samsung Health, Zwift, and Peloton.

Pricing follows a straightforward model at $20 per month flat rate for full API access across all providers without hidden fees. There is no per-user pricing that scales unpredictably as your application grows, which makes costs predictable for budgeting. The platform launches private beta on September 1, 2026, with only 50 founding slots available. The $20 deposit converts directly into the first month of service rather than representing an additional fee, and full refunds are available if the platform does not ship or if participants change their minds before receiving production keys.

The target audience includes developers at fitness startups who cannot afford months on integration work, training platform companies expanding device support, sports analytics firms needing comprehensive data from athletes using diverse equipment, and any software team that needs unified wearable data without maintaining multiple vendor integrations. For teams who have burned weeks building brittle device connections that break whenever a manufacturer updates their API, Stridee offers an abstraction layer that eliminates that ongoing maintenance burden while providing better reliability than most teams achieve building integrations themselves.