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Semilattice shows you how your users will react to your work before they see it. Give it a plan, a set of messages, a landing page or a sign-up flow, and simulated users built from real human data answer questions about it or go through it. You get back what they support, what they push back on, and what to change. You can work with Semilattice in the app, or from your own AI agent. Both work on the same projects, so you can start in one and carry on in the other.

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In the app

Open a project and tell the agent what you want to find out, or upload a document or images. The agent plans a set of simulations, you check the plan, and when they finish you get a synthesis across all of them that says what to change.

Using the app

Set up your context, start a project, and read the results.

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From your own agent

Connect Claude, Claude Code, Cursor or any other client that supports MCP, and your agent can plan and run simulations itself, inside the tool you already work in. What it creates is saved as a project in the app, so you can open it there, carry on with the agent in the app, and go back to your own agent later.

Semilattice MCP

How your agent uses Semilattice, and the tools it gets.

Connect

Add Semilattice to your client.
To build Semilattice into your own tools, use the API.

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Next

How Semilattice works

The parts you work with.

Create an account

Sign up and set up your context.

User-in-the-loop guide

Video lessons on real projects.