Simulation-Driven Validation for AI-Generated Code

CodeYam is a simulation-based tool that shows exactly how software behaves across real UI states, components, and data. It helps developers understand, test, and trust code changes so they can ship confidently.

Agentic coding tools help you ship fast, but understanding the impact of their changes remains complex.

CodeYam mobile illustration showing AI coding workflow from code to unexpected bugs

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 with data simulating edge cases and scenarios

built for developers working with agentic tools

Navigate complexity at the speed that code is being created.

automatic Simulations

For every code change, get interactive previews of all affected components, flows, and screens so you can see exactly what changed.

Automatic simulations showing transformation from code to interactive previews

Multi-Scenario, Data-Aware previews

CodeYam creates realistic edge case simulations using semantically-aware mock data to verify that changes work as intended in both common and rare conditions.

Multi-scenario data-aware previews showing different user types: first time user, returning user, and exceptional user interfaces

Change Comparison & History

Compares app state before and after a change to highlight functional differences.

Change comparison and history showing before and after app states

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 - app organized by recent changes, pages, and components with different data states

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 seeded 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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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

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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