HealthGPT
Query your Apple Health data with natural language
About HealthGPT
HealthGPT is an open-source iOS app developed by the Stanford Biodesign Digital Health team that lets users interact with their Apple Health data using natural language. Built on the Stanford Spezi framework, it supports querying sleep, step count, active energy, exercise minutes, heart rate, and body mass through a conversational chat interface.
Pros & Cons
Pros
- Completely free and open-source with no subscription fees
- Privacy-preserving local LLM option keeps health data on-device
- Built by Stanford's Biodesign Digital Health team with academic rigor
- Natural language interface makes health data accessible to non-technical users
- Extensible Spezi framework allows developers to add custom health modules
Cons
- iOS only — no Android or web version available
- Currently available only through TestFlight, not the App Store
- Limited to Apple Health data types (sleep, steps, heart rate, etc.)
- Requires OpenAI API key for cloud-based queries, adding extra cost
- Not a substitute for professional medical advice — informational only
Key Features
Natural Language Health Queries
Ask questions about your health data in plain English and get contextual answers from your Apple Health records
Apple Health Integration
Connects to Apple Health via SpeziHealthKit to access sleep, steps, active energy, exercise minutes, heart rate, and body mass data
GPT-3.5 & GPT-4 Support
Leverages OpenAI models through the SpeziLLM module for accurate natural language understanding and responses
Local LLM Execution
Privacy-preserving option to run queries locally using Llama3 8B, with automated model download and storage during onboarding
Speech-to-Text & Text-to-Speech
Accessibility features powered by the SpeziChat module for voice-based interaction and spoken responses
Chat Export
Export your health conversations for record-keeping or sharing with healthcare providers
Extensible Architecture
Built on Stanford Spezi open-source framework, making it easy for developers to customize and extend functionality
Pricing
- Full app access
- Apple Health integration
- Natural language queries
- GPT-3.5 & GPT-4 support
- Local LLM option
- Speech accessibility
- Chat export
Best For
Personal Health Tracking
Ask natural language questions about your fitness trends, sleep patterns, and activity levels without manually reviewing charts
Health Data Exploration
Discover correlations between different health metrics like sleep quality and exercise habits through conversational queries
Accessibility for Health Data
Use voice commands and speech output to access health information, ideal for users with visual impairments or limited mobility
Developer Health App Prototyping
Leverage the open-source Spezi framework to build custom health AI applications on top of HealthGPT's architecture
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