Synheart's infrastructure is live. On-device inference is free, forever.
Synheart's infrastructure is live. On-device inference is free, forever.
The Human Layer for AI.
Runs on device
Compatible with any device, wearable or not
STATE INTELLIGENCE INFRASTRUCTURE
Synheart turns the signals your tools already produce — code, agents, apps, devices — into contextual state that AI can act on: what the person is working toward, which decisions are binding, what changed, and how sure we are. Start with the work signals you already have.
Three Ways In
On its own, a read on someone's state is just information. Combined with what your tools already know, it lets them guess less.
For developers
Use the SDKs to give your product a read on its users' state through HSI, the open standard. Register your app on the Platform to get started.
For teams
Synapse gives the AI tools your team already uses your organization's knowledge and, with each person's consent, their working state, so they can guess less.
For individuals
Download Life. It learns your personal patterns on your device, like focus, strain and recovery, and you decide which tools may use them.
What You Can Build
Here's what teams are building on Synheart today, from consumer wellness apps to infrastructure integrated directly into other companies' products.
Track focus, stress, and recovery daily, keeping data on their device.
Provide context on stress and mental load for better responses.
Identify focus levels and design the app accordingly.
See how a product actually affects the people using it, read directly on their device.
Create products that detect when users are disengaged and adapt accordingly.
Give researchers a real-time, structured way to study attention and stress.
Signal Sources
There are two kinds of signals that Synheart's HSI infrastructure can process.
Physiological signals from any device reading the body watch, ring, patch are standardized by Synheart into a consistent stream.
Behavioral signals from digital devices: typing rhythm, scrolling pace, and patterns. All content remains private, focusing on interactions, not actions.
WHOOP
WATCH
FITBIT
Pixel
Compatible with wearable and wellness devices, and the digital devices people already use.
How It Works, Simply
Synheart handles the signal processing, the on-device computing with locally inferred models, and the output. You integrate once.
Where your team manages what you've built: keys, usage, subscriptions, and more, from a detailed developer dashboard that shows your app's data in one place.
Explore Platform
The one thing you actually integrate. Connects to signals, runs locally inferred models on the device, and gives you a clear read.
Explore Core SDK
In Practice
There are two kinds of signals that Synheart's HSI infrastructure can process.
These are estimates intended for software to build with. When signal confidence is low, Synheart reports that directly.
For Builders
Integrate Core SDK, pick a signal source, and read structured output immediately.
Privacy, Built In
Personal inference is local by default; any cloud or team features are opt-in and permissioned.
Research & Partners
Mila
Quebec AI Institute Montreal, Canada
Synheart is part of Mila's Emerging Startup program, at Quebec AI Institute. Our founder worked in Yoshua Bengio's lab at Mila before starting Synheart.
On-Device AI
Real-time inference on the wearable itself
Synheart models are small enough to run on the hardware people already wear. Inference runs on the wearable itself, in real time, with nothing sent to the cloud.
Academic Partners
Collaborative research for real world impact
We collaborate with universities and labs, always with consented participants and ethics oversight, so our work stays grounded in real-world conditions.
Open Science
A more open and human centered future
Our papers are public, our SDKs are open source, and our datasets are free on Hugging Face, so anyone can check our work, replicate it, and build on it.
Why We Build This
And What's Built On It
Human state, read on-device and built into products people use.
THE AGE OF AGENTS
Agents now write, schedule, decide, and interrupt on people's behalf. They know the task, but not your organization's history or the person in front of them. Synapse brings both to the AI tools you already run: your organization's knowledge and, with consent, each person's working state.
Start Building
Give a product a real, live read on how someone is doing: focus, stress, and recovery, all on their own device.
Start free
faq
