Side by side
ast-grep vs Moderne
Both stand on code refactoring tools. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan APIExtensionLinux+3
ast-grep combines structural code search, configurable linting, and rewriting in a free, open-source tool. Its language coverage and integrations are broad, though it does not provide some advanced static-analysis information and rules are limited to one language at a time.
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Free plan APILinuxMac+3
Moderne focuses on coordinated software change and status reporting across repository estates, with both hybrid SaaS and air-gapped deployment options. Review plan scope and deployment fit before selecting an offering.
Visit ModerneThe facts
| ast-grep | Moderne | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | No |
| Runs on | API, Extension, Linux, Mac, Web, Windows | API, Linux, Mac, Self-hosted, Web, Windows |
| Lowest paid plan | Free or on request | Backpatch Alliance Member: $2,000 a month |
| Plans published | 1 | 8 |
| Maker | Not published | Not published |
| Website | ast-grep.github.io | moderne.ai |
| On code refactoring tools | #1 of 22 | #5 of 22 |
ast-grep: what it does well
- Searches and rewrites code by syntax-tree pattern.
- Interactive CLI previews rewrites before applying them.
- Supports 20+ languages and custom language loading.
- Rule tests can use snapshots.
- Online playground works without local installation.
What to know first
- Some advanced static-analysis information is unsupported.
- A rule cannot target multiple languages at once.
Moderne: what it does well
- Runs recipes across thousands of repositories
- Offers air-gapped deployment with no outbound connectivity
- Supports multi-repository commits and pull requests
- Community version includes cross-repository search
What to know first
- Member plan costs $2,000 a month
- Member plan is limited to one legal entity
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