Sentinel

Proactive health companion

Environmental risk and wearable context—so you can act early, not only after you feel sick.

Sentinel merges map, media, and air or weather signals with sleep, stress, and recovery-style signals from your wearable. Open the map to see risk around you, ask the assistant what it means for you this week, and get notifications when outside risk and inside readiness overlap in a meaningful way.

Sentinel companion

Field signal · France

Environmental context — urban layer
Environmental context — regional view
Environmental context — landscape signal
Environmental context — atmosphere
Environmental context — horizon

The problem

Headlines and alerts rarely meet the numbers on your wrist. Wearables show scores but rarely answer “Given what’s going on outside, how should I treat myself today?” Prevention is an order of magnitude cheaper than treatment—yet much consumer health tech still intervenes only after you are already sick.

Sentinel Map

MapLibre radar over France

Health-relevant incidents: disease signals from French RSS (structured with an LLM), pollution (WAQI), and weather grid data (OpenWeather)—so “something going around” becomes geography you can see.

Open Sentinel Map
Wearables · Sentinel Companion

Thryve summaries and a grounded assistant

Daily and epoch biometric data roll into summaries (sleep, stress, recovery-style signals) via Thryve. The AI assistant (Mistral via Vercel AI SDK) uses tools that read live incidents, weather-related context, and your summary so answers stay tied to tool output—not invented metrics.

Sign in to Assistant
Proactive nudges

Cron-backed notifications

Background ingest and evaluation jobs can create in-app notifications (and browser notifications when permitted) that combine environmental cues with wearable state—timely, non-diagnostic prompts to act upstream.

Sign in for nudges
Alan Play · Personalized Wrapped

Spotify-style health recap (demo)

Synthetic employer wellness data becomes a short narrative with team and league context—story cards you can step through and share. Ask the assistant about your wrap, or open the viewer for the full experience.

Sign in for Wrapped

Team

What we'd do next

  • Single prevention score or briefing surface—map risk plus wearable readiness in one plain-language “act today” line.
  • Deep links from map incidents into the assistant with context pre-loaded; stronger paths from notifications into chat.
  • B2B or employer view with anonymized regional or office-level risk and engagement metrics.
  • Push on mobile by wiring Expo to the same nudge API.
  • Voice input for speech-to-text into the assistant.

Tech stack

Turborepo · pnpm · Next.js · tRPC · Zod · PostgreSQL (Neon) · Drizzle · Better Auth · MapLibre · Mistral (Vercel AI SDK) · Thryve · Vercel hosting and cron · Expo (companion scaffold)