About HearthByte
The architecture for the next generation of developers.
The Short Version
HearthByte is an indie software studio building tools for developers who work with AI agents.
We started with a question: What if design tools were built for machines to use, not just humans to click? The result is Ensemble: a deterministic, API-first toolkit that agents can call directly.
No screenshots. No copy-paste. Just structured data in, design system out.
"Stop building for browsers. Start building for agents."
What We're Building
The browser era is ending. The agent era is starting.
Developers are no longer the only ones writing code. Agents are calling APIs, generating assets, and shipping features. But most tools weren't built for this. They assume a human is clicking buttons and reading screens.
We build for the new paradigm:
- Agent-native tools that speak structured data, not pixels
- Deterministic outputs so agents get consistent results
- Human override because collaboration beats delegation
- Open formats you can read, export, and own
How We Build
We use AI as a collaborator, not a replacement. Every feature is designed by humans, reviewed by humans, and shipped with intention.
This isn't "vibe coding." We understand every line. We can explain every choice. The human leads. The AI accelerates.
Ensemble itself is built this way: AI helps us ship faster, but the human makes the decisions.
The Team
HearthByte
HearthByte is a small indie studio focused on building tools for the agent era.
Ensemble started because every design tool assumed you were a human with a mouse. But when you're building with agents, you need tools that agents can use.
Small team. Clear vision. Shipping fast.
What's Next
Ensemble is just the start. We're building the infrastructure for agent-native development:
- Live Canvas — Watch your agent build. Steer when you want.
- More toolkits — Beyond design, into code generation and deployment
- Local-first AI — Your agent, your machine, your data
Stop building for browsers. Start building for agents.
Get Started
Explore Ensemble and see what agent-native design tools can do.