Gradual: health app that aggregates activity, lab biomarkers, habits, and mood to compute personalized health scores (e.g., Gradual Age) with subscription monetization.

DRAFT

Resubmit to App Store by end of this week; expected review ~4–5 days; launch immediately upon acceptance.

0 features

0 milestones

4 roles

Project Overview

Problem Statement

Help users understand and improve their health by unifying key health data sources (activity, labs, habits, mood) and translating them into actionable scores like Gradual Age.

Ideal Customer Profile

Mainstream iPhone users who want to get healthier and like evidence-based health content (e.g., audiences similar to Huberman/Attia): they want simple, actionable insights from activity, labs, habits, and mood in one place.

App Audience

Public-facing consumer mobile app

Project Type

Update/enhancement to existing app (pre-launch)

Founder-built mobile app not yet launched; iPhone first. Built with Expo/React (React Native). Submitting to iOS App Store soon; resubmission by end of week. Uses Apple Health for activity data, built-in habit tracking, subjective mood entry. Lab results PDFs parsed via Claude (AI). User data stored in their own iCloud (CloudKit) for privacy/security. Subscription pricing: $3.99/mo or $39.99/yr; free tier includes 1 lab PDF parse, paid up to 10/month. Domain: gradual.health. Engineering work done by founder; no fixed engineering budget (will pay for needed software/tools). Android planned in a few weeks; will require Firebase hosting and Android equivalent of Apple Health integration plus other platform tweaks.

Integrations

Apple Health; iCloud (CloudKit) storage; Claude (Anthropic) API for lab PDF parsing; Apple In-App Purchases/subscriptions. Future: Firebase (for Android hosting) and Android health data integration.

Tech Stack Preferences

Expo / React Native (existing). Other stack TBD; open to suggestions for backend.

Deployment Preferences

iOS App Store distribution; currently minimal backend; iOS uses iCloud user-owned storage. For Android, expects to add Firebase hosting.

Design Status

TBD

Skills Needed

Mobile Engineer (React Native)

Build and maintain the Gradual mobile app (iOS-first, Android next) using Expo/React Native; implement health data integrations, UI, and local/offline-first storage patterns.

React NativeExpoTypeScriptApple HealthKitAndroid Health Connect

Backend / Cloud Engineer

Design any minimal backend services needed (especially for Android), including secure storage/sync, quotas, and integration points (e.g., lab parsing pipeline).

FirebaseCloud FunctionsAPI designAuthenticationSecurity

Data / Health Metrics Engineer

Define and implement health scoring logic (Gradual Age, Balance subscores, biomarker scoring) and validate formulas and edge cases.

Data modelingStatisticsHealth metricsAlgorithm designTesting

DevOps / Release Engineer

Handle build/release pipelines for iOS and Android, App Store submissions, and environment/config management for third-party services.

EAS BuildApp Store ConnectCI/CDSecrets managementMonitoring