Turn legacy code into
modern, shippable apps.
Upload your old codebase. CodeShift analyzes it, plans the migration, rewrites it into a modern stack, tests it, and hands you back a working application — in hours, not months.
First migration on us · No credit card required
codeshift analyze ./legacy-shop.zip
✓ Detected: PHP 5.6 + jQuery 1.9 · 84 files
⚠ 11 outdated deps · 3 SQL-injection risks flagged
Recommended path: PHP to Laravel 11 + React
codeshift migrate --design modern-saas
⠿ Rewriting controllers/CheckoutController.php as app/Http/Controllers…
The workflow
From scary to shippable in four moves
No manual rewrite. No month-long project. Upload, review, deploy.
Analyze
CodeShift scans the whole repo, detects the framework and version, maps dependencies, and flags risks before touching a line.
Plan
It proposes a dependency-aware migration plan and the ideal target stack — scaffolding, data layer, logic, UI, tests.
Rewrite
The engine restructures your code into modern, idiomatic architecture — not a line-by-line port — streaming it live.
Ship
You get a tested, documented, deployable project with a side-by-side diff explaining every decision.
Migration paths
Modern stacks, on rails
Battle-tested routes today — more added continuously.
PHP to Laravel
Procedural PHP, raw mysqli queries, and mixed HTML/logic become a clean Laravel app with Eloquent models, controllers, migrations, and Blade/Inertia views.
Laravel 11 + Eloquent + Inertia (React)
jQuery to React
Imperative DOM manipulation and spaghetti event handlers become declarative, component-based React with hooks, typed props, and modern state management.
React 18 + TypeScript + Vite
WordPress to Next.js
PHP themes and the WP template hierarchy become a headless Next.js App Router site — server components, ISR, and a typed content layer.
Next.js 14 (App Router) + TypeScript
Python 2 to Python 3
print statements, old-style classes, and 2.x stdlib calls are modernized to idiomatic Python 3.12 with type hints, f-strings, and pathlib.
Python 3.12 + type hints
AngularJS to React
AngularJS 1.x controllers, $scope, and directives become React function components, hooks, and a predictable unidirectional data flow.
React 18 + TypeScript + Vite
Vanilla JS to Vue 3
Hand-rolled DOM scripts become a Vue 3 single-file-component app with the Composition API, reactive state, and Vite tooling.
Vue 3 + TypeScript + Vite
Everything in the box
A full modernization team, automated
The work of an agency engagement — analysis, rewrite, tests, docs, deploy — in one engine.
Smart Codebase Analysis
Maps dependencies, detects the framework, and flags risks before any code is touched.
Intelligent Rewriting
Restructures following clean architecture and current conventions — not just syntax translation.
Frontend Redesign on Demand
Rebuild the UI while migrating — modern, responsive, accessible, in the style you pick.
Auto-Generated Tests
Every migration ships with a test suite, so you know the new code behaves like the old.
Side-by-Side Diff Viewer
Old vs. new, line by line, with an explanation for every decision the engine made.
Dependency Modernization
Swaps outdated, vulnerable libraries for secure, maintained alternatives.
Documentation Generator
Full docs for the migrated codebase — README, API docs, inline comments.
One-Click Deploy
Push the modernized app straight to Vercel, Netlify, or your own server.
Pricing
Pay per migration. No subscriptions.
Priced on codebase size and complexity. Your first migration is free.
Free
Your first migration, on us.
- Full codebase analysis
- One complete migration
- Auto-generated tests
- Diff viewer & docs
$500–$2,000
Based on size & complexity.
- Everything in Starter
- Unlimited file count
- Frontend redesign on demand
- Dependency modernization
- One-click deploy
- Priority engine throughput
FAQ
Frequently asked questions
Everything about AI-powered legacy code migration, answered.
What is CodeShift?+
CodeShift is an AI code modernization engine. You upload a legacy codebase (or import a GitHub repo); it analyzes the whole project, plans the migration, rewrites it into a modern stack in dependency order, verifies every file for behavior parity, and hands back a tested, documented application with a side-by-side diff.
Which legacy code migrations does CodeShift support?+
PHP to Laravel 11, jQuery to React 18, WordPress to Next.js 14, Python 2 to Python 3.12, AngularJS to React, and vanilla JavaScript to Vue 3 — with more migration paths added continuously.
How is this different from asking ChatGPT to rewrite my code?+
A chat model rewrites one snippet at a time with no view of the whole system. CodeShift builds a dependency graph of your entire codebase, migrates files in the right order so imports stay consistent, injects already-migrated symbols into each rewrite, and runs a closed-loop verifier that checks behavior parity per file and auto-repairs failures.
Is the migrated code actually tested?+
Yes. Every file passes structural checks and an adversarial AI behavior-parity review, failures are repaired automatically, and the finished migration ships with an auto-generated test suite plus per-file confidence scores.
How much does an AI code migration cost?+
Your first migration is free — no credit card required. After that, pricing is per project based on codebase size and complexity, typically $500–$2,000, with no subscription.
Is my source code private and secure?+
Your code is processed solely to produce your migration, is never used to train models, and GitHub imports request read-only access via OAuth that you can revoke at any time.
How long does a migration take?+
Hours, not months. Analysis takes minutes; the rewrite streams live so you watch files being modernized in real time, and a typical small-to-medium codebase completes the same day.
The code you're scared to touch,
turned into something you're proud to ship.
Built for freelancers, agencies, and teams sitting on aging code. Stop dreading the rewrite.