Simulation-Driven Validation for AI-Generated Code

CodeYam is a simulation-based tool that helps developers understand, test, and trust code changes so they can ship confidently.

CodeYam shows exactly how your app behaves
across real UI states & components,
with data
simulating edge cases & scenarios.

CodeYam shows exactly how your app behaves across real UI states and components

What are simulations?

Simulations preview each change across different states and data scenarios, helping you understand exactly what changed in your app and confirm it matches your intention.

What are simulations? Different states of a function and interactive preview

A new way of exploring your product

CodeYam breaks down your app so you can explore, isolate, share & discuss specific parts of it with your team.

A new way of exploring your product - showing app organization

Built for developers working with agentic tools

CodeYam helps you navigate complexity at the speed that code is being created, by providing you with:

Automatic Simulations
Data-Aware Previews
Before & After Comparison

how it works

โœ… Install the GitHub app or CLI tool.

๐Ÿ” CodeYam detects code changes (pre-commit for CLI, post-commit for GitHub).

๐Ÿงช We run your app through real flows using semantially-aware AI-generated mock data.

๐Ÿ‘€ You see the output: visual simulations, logs, and summaries of behavior.

๐Ÿ’ก Merge with confidence or catch bugs early.

watch how your product responds to change

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Built by experienced technologists

Our team has built products with new technologies at companies like Pivotal Labs, Lyft, Meta, and various startups. We've seen how development tooling needs to evolve as codebases and teams grow.

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AI coding assistance is powerful but creates new challenges around code comprehension and change validation. CodeYam addresses this specific gap in the development workflow.

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Backed By:

...and more.

CURIOUS ABOUT CODEYAM?

We support:

TypeScript, React, Next.js, Remix (more soon)

Integration:

GitHub App (post-commit)

CLI tool (pre-commit, coming soon)

Security:

Simulations run in isolated environments