Human State Infrastructure for Modern Systems
Privacy-preserving, on-device human-state signals derived from biosignals and behavior.

Synheart is an open, privacy-preserving Human State Interface (HSI) infrastructure that enables software systems to understand human emotional, cognitive, and behavioral state — without relying on explicit user input.

Instead of clicks, prompts, or surveys, Synheart derives human state from biosignals and digital behavior, processed locally and represented in a standardized format.

At the core of Synheart is HSI 1.0 — a canonical, language-agnostic JSON contract for representing human state across independent systems.

HSI plays a role similar to GPS or HTTP — a shared communication standard for human state.

Synheart provides modular interpreters that emit HSI 1.0-compliant outputs:

• Synheart Emotion
  Interprets emotional dynamics such as stress, calm, and arousal from physiological signals.

• Synheart Focus
  Models cognitive engagement, attention stability, and mental load over time.

• Synheart Behavior
  Captures behavioral patterns derived from interaction and usage dynamics.

All modules are composable, interoperable, and optional — systems can adopt only what they need.

[ Wearables & Devices ]
Apple Watch • Pixel Watch • Sensors
↓
Synheart Wear (vendor-agnostic signal access)
↓
Human State Modules (Emotion • Focus • Behavior)
↓
HSI 1.0 (canonical human-state JSON)
↓
Your System (AI • Interfaces • Agents • Apps)

• On-device processing by default
• No raw biosignals required to leave the device
• Derived state only (HSI outputs)
• Consent-gated cloud sync (optional)

Synheart is built to support ethical, human-centered computing from the ground up.

• Flutter
• Kotlin
• Swift
• Go
• Python
• TS

More SDK-specific setup is available in each package’s README and in docs/.

• 🧠 Standardized human state — not ad-hoc emotion labels
• 🔐 Privacy-preserving by default
• 🧩 Modular and extensible
• 🌍 Vendor- and platform-agnostic
• 📄 Open source with open research

Synheart is not an app, model, or agent.

It is infrastructure for human-state-aware systems.

• Expanded HSI schema (v1.x)
• Additional state interpreters
• On-device kernels
• Reference integrations
• Research benchmarks

Synheart is built in the open.

We welcome contributions across:

• Signal processing
• State modeling
• SDKs
• Specifications
• Research & validation

See REPOSITORY_IMPLEMENTATION_GUIDELINES.md for repo conventions, and the nearest package-level CONTRIBUTING.md for contribution workflow.

Licensed under the Apache 2.0 License. © 2025 Synheart AI.