Privacy‑first HealthKit app launches
Metrya, a new iOS app, positions itself as privacy‑first by using Apple HealthKit for data, offering features like a Recovery Score, Biological Age estimate, and LLM chats with a BYOK (bring‑your‑own‑key) API. The developer promoted the app in multiple threads over the last 48 hours and emphasized local HealthKit access rather than server‑side data hoarding. The app illustrates a growing consumer demand for wearable integration combined with tighter privacy controls. (x.com)
A new iPhone app called Metrya is pitching a simple trade: read your Apple Health data locally, then let users bring their own artificial intelligence key instead of handing data to another health startup. (metrya.app) Metrya says it works with Apple HealthKit on iOS 16 and later and offers a daily Recovery Score, a Biological Age estimate, anomaly alerts, and chat-based answers about sleep, heart rate variability, and recovery. Its site says the Recovery Score runs entirely on-device, while the chat feature works with user-supplied keys for Claude, OpenAI, or Gemini. (metrya.app) The App Store listing says the app has no accounts and no subscriptions, and that “every metric” is processed on the iPhone. A separate product listing says core features are free and a Pro upgrade is sold as a one-time purchase priced at $9.99. (apps.apple.com, ai-hunt.tech) HealthKit is Apple’s system for storing health and fitness data from the iPhone, Apple Watch, and approved third-party apps in one place. Apple’s developer documentation says outside apps can read or write that data only with user permission. (developer.apple.com) Apple has spent the past several years turning that permission model into a privacy pitch of its own. Apple says health and fitness data in the Health app is encrypted and inaccessible by default when the device is locked, and that synced Health data in iCloud is not readable by Apple when users have iOS 12 or later with two-factor authentication turned on. (apple.com, apple.com) That setup leaves room for a new class of apps: software that analyzes HealthKit data without building a separate cloud archive of medical-adjacent information. Metrya’s site says data goes “directly from your phone to your chosen AI provider,” rather than through Metrya’s own servers. (metrya.app) The tradeoff is that privacy depends on where the artificial intelligence request goes next. Metrya says users choose the provider and pay that provider directly through their own application programming interface key, which shifts both cost and some data-handling decisions away from the app maker. (metrya.app) The health scores themselves also need caution. Metrya says its Biological Age score is estimated from cardio fitness, heart rate variability, sleep quality, and metabolic markers, but consumer-facing “biological age” tools can vary widely because they depend on the inputs and model assumptions chosen by each app. (metrya.app, decrypt.co) The launch lands as Apple’s Health app already aggregates more than 150 types of health data, creating a large installed base for software that does not need its own wearable hardware. Apple’s privacy white paper says the company designed HealthKit around data minimization, on-device processing, and user control over sharing. (apple.com) For now, Metrya looks less like a new sensor company than a new interface layer on top of Apple’s existing health stack. The bet is that some iPhone users want more interpretation from their health data without giving one more company a permanent copy of it. (metrya.app, developer.apple.com)
