Tern LogoTern

90% Faster Migrations

Make big AI-driven changes, with the visibility you need to trust it

Structured automation for the biggest migrations

Search Deeply

Find every line of code to change with deep code analysis across multiple repos.

Change Broadly

Generate candidate changes with AI-powered workflows, testing to know what worked immediately.

Ship Incrementally

Group changes into small PRs, find the right owner, and ship with confidence.

Our Philosophy

Remember the beginning of that last project? Everything is new. Easy to change. But as it takes shape, there's an inertia that sets in. Bitrot starts to pull everything backwards. The code on the screen starts to feel more important than the ideas in our heads. The grind of security updates, dependency bumps, and making the same change in 500 places across 12 repos is suddenly an everybody problem.

That's the cost of maintenance. At Tern, we want to make it as easy to maintain a 100m line codebase as a 100-line one. We combine AI, structured code search, AST parsing, and real-world migration techniques to maximize automation while maintaining accuracy. We've wrapped in up in an easy-to-use platform that gets your entire team on the same page and lets you blast through even the biggest changes safely.

What will you migrate?

Frameworks upgrades -- React, Vue, SQLAlchemy, more

New lint rules -- with all fixes applied

Frontend design system -- your components, your designs

Language version upgrades -- Python, JS, more

Types adoption -- TypeScript, Pydantic, more

Security fixes -- without stress