Grit / grit.io
AI-powered code migration and modernisation tool that automatically upgrades dependencies, migrates codebases between frameworks, and updates deprecated APIs using pattern-based code transformation.
Pricing
Free
Free plan
Yes
Category
Developer Tools
Platforms
3
Free plan
Yes
API access
Yes
Open source
No
Platforms
3
Grit.io is an AI code transformation tool specialising in the difficult task of code migration — upgrading a codebase from one framework version to another, migrating from one library to a replacement, or modernising deprecated API usage across thousands of files. This is work that developers dread and typically avoid until technical debt becomes unmanageable.
The GritQL language allows defining code transformation patterns that Grit applies to the entire codebase — specifying 'find all usages of this deprecated function and replace with this new API pattern' in a structured way that scales to millions of lines of code. Unlike simple find-and-replace, GritQL understands code structure (AST-aware), handling complex transformations that simple text substitution would mangle.
Grit's pre-built migration library covers common migrations like React 16 to 18, Enzyme to Testing Library, Moment.js to date-fns, Python 2 to 3, and many others. Teams can apply a pre-built migration recipe to their codebase rather than writing custom migration scripts.
The AI component adds capability beyond pattern-based rules — for transformations too complex to express as patterns, AI understands code semantics to generate appropriate transformations. This hybrid of pattern-based and AI-based transformation handles more of the migration work than either approach alone.
For engineering teams facing major framework upgrades or dependency modernisation that would otherwise require weeks of manual developer work, Grit.io can automate significant portions of the migration.
Grit.io runs as llm coding model software built around code and text workflows. Users typically start with a prompt, upload, or connected data source, and the underlying model handles the heavy lifting before returning a result you can refine or export. It's available on web, cli, and github, with API access for teams that want to embed it into their own products.
The capabilities that matter most for teams evaluating Grit.io.
AST-aware code transformation pattern language that understands code structure, enabling complex structural transformations that text-based find-and-replace cannot handle.
Ready-to-run migration recipes for common framework upgrades and library replacements, applying proven transformation patterns across the entire codebase.
For transformations too complex to express as patterns, AI understands code semantics to generate contextually appropriate transformation suggestions.
Free plan available. Pro $50/month. Enterprise custom. Contact for team and enterprise pricing.
Model
Freemium
Starting price
Free
Free trial
No
OpenRewrite (open source) provides Java-focused code migration at scale. Codemod.com provides code transformation tooling. Aider and other AI coding tools can handle migration tasks but without Grit's scale and pre-built recipes.
A side-by-side look at the closest alternative in this category.
Key facts about model providers, platforms, and team support.
Model Provider
Grit, OpenAI
Platforms
Web, CLI, GitHub
Deployment
SaaS, Open Source
Integrations
GitHub, GitLab, VS Code, API
Team Collaboration
No
Launch Year
2023
Compliance signals and data-handling notes as reported by the vendor.
Review Grit.io's data handling policy. Code content transmitted for AI transformation analysis.
Review Grit.io's privacy policy. Code is transmitted to Grit's infrastructure for AI-assisted transformation. Enterprise includes data handling agreements.
Editorial Verdict
Grit.io is the best AI code migration tool for engineering teams facing major framework upgrades or library replacements who want to automate significant portions of the migration work across large codebases.
Last verified July 24, 2026.
Free plan available. Pro $50/month. Enterprise custom. Contact for team and enterprise pricing.
Free plan (2 weeks trial, then limited). Pro $20/month. Business $40/user/month. Enterprise custom.
Review Grit.io's data handling policy. Code content transmitted for AI transformation analysis.
Review Cursor's data handling policy. Code and rules file content processed on Cursor's infrastructure for AI features.
Review Grit.io's privacy policy. Code is transmitted to Grit's infrastructure for AI-assisted transformation. Enterprise includes data handling agreements.
Review Cursor's data handling policy. Code content and .cursorrules instructions are included in AI context and processed on Cursor's infrastructure.
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