CodeYam helps developers understand, test, and trust code changes
so they can ship confidently.
CodeYam helps developers understand, test, and trust code changes
so they can ship confidently.


What are simulations?What are simulations?
Simulations preview each change across different states & data scenarios to help you understand what changed & confirm it matches your intention.

What are simulations?

A new way to explore your productA new way to explore your product
CodeYam breaks down your app so you can explore, isolate, share & discuss specific parts of it with your team.

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

Especially Potent with Agentic AI ToolsEspecially Potent with Agentic AI Tools
CodeYam's simulations let you see how AI code changes your application by providing:
Especially Potent with Agentic AI ToolsEspecially Potent with Agentic AI Tools
CodeYam's simulations let you see how AI code changes your application by providing:
We've built products at companies like Pivotal Labs, Lyft, Meta, and startups. We've seen how development tooling must evolve as codebases and teams scale.
You should be confident and able to move quickly, whether you are making changes or ramping up on unfamiliar code. Traditional development tools and processes are helpful, but can require a lot of manual work. CodeYam addresses this, making developers and software teams more efficient.
Backed By:
...and more.
We've built products at companies like Pivotal Labs, Lyft, Meta, and startups. We've seen how development tooling must evolve as codebases and teams scale.
You should be confident and able to move quickly, whether you are making changes or ramping up on unfamiliar code. Traditional development tools and processes are helpful, but can require a lot of manual work. CodeYam addresses this, making developers and software teams more efficient.
Backed By:
...and more.
We've built products at companies like Pivotal Labs, Lyft, Meta, and startups. We've seen how development tooling must evolve as codebases and teams scale.
You should be confident and able to move quickly, whether you are making changes or ramping up on unfamiliar code. Traditional development tools and processes are helpful, but can require a lot of manual work. CodeYam addresses this, making developers and software teams more efficient.
Backed By:
...and more.
✅ Install the GitHub app or CLI tool.
🔁 CodeYam detects code changes (pre-commit for CLI, post-commit for GitHub).
🧪 We run your app through real flows using semantially-aware AI-generated mock data.
👀 You see the output: visual simulations, logs, and summaries of behavior.
💡 Merge with confidence and catch bugs early.
Watch how your product responds to change
Watch how your product responds to change
watch demo
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
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