Modern software systems track clicks, taps, and text inputs—explicit interactions that reveal intent but fail to capture the user's internal state. As Synheart's introduction highlights, these traditional signals arrive late, interrupt workflows, and ignore the continuous stream of physiological and behavioral data that could transform human-computer interaction.

At its core, Synheart's Human State Interface (HSI) establishes a new primitive for computing: structured representations of human state derived from biosignals and digital behavior. Unlike raw biometric data, HSI outputs standardized JSON descriptors of cognitive and emotional states—such as stress levels or focus intensity—that applications can consume without accessing sensitive sources.

Article illustration 1

Privacy by Architecture

The system enforces privacy through three key design choices:
1. On-device processing: All computation occurs locally, with raw heart rate data and physiological signals never leaving the device.
2. Abstracted outputs: Applications receive only HSI-formatted state descriptors, not biometric streams.
3. Content-agnostic analysis: Behavioral modeling captures interaction patterns (keystroke rhythms, app-switching frequency) without monitoring content.

Technical Components

  • HSI Specification: An open standard defining validation rules and JSON schemas for human state data exchange
  • Synheart Wear: Vendor-agnostic library normalizing biosignals from consumer wearables into unified inputs
  • Synheart Behavior SDK: Converts UI interactions into behavioral features for focus/distraction inference

Developer Implications

The infrastructure enables novel use cases while addressing ethical concerns:

"Human state becomes a first-class signal, alongside time, location, and interaction. This allows systems to reason about human state without ever accessing sensitive biometric data," notes Synheart's documentation.

Developers can build adaptive interfaces that respond to cognitive load, while researchers gain standardized representations for human-AI interaction studies. All specifications and SDKs are open-source from launch, encouraging ecosystem development around privacy-preserving human-state awareness.

The introduction of HSI represents a fundamental shift: from systems that wait for explicit commands to those that ethically interpret human state in real time. As computing evolves beyond clicks and taps, Synheart's architecture offers a blueprint for responsiveness that honors both capability and constraint—transforming how machines perceive people without turning them into data points.

Source: Synheart Blog - Introducing Human State Infrastructure for Modern Systems