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Side-by-side features, use cases and pricing — because the right pick depends on your job and budget, not just the ranking.
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JS2TS
✓ verifiedFree
Free AI web tool that converts JavaScript into typed TypeScript instantly, adding interfaces and annotations with no login.
9.4K visits/mo3.9K saves
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Code Arena
✓ verifiedFree
Side-by-side arena to compare AI coding models and build multi-file apps, with a public leaderboard and battle mode.
35M visits/mo201 saves
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Google Antigravity
✓ verifiedFree
Google's agentic development platform and IDE for building software with autonomous, Gemini-powered coding agents.
22M visits/mo18K saves
Pricing
No public pricing
No public pricing
No public pricing
Core features
- ✦AI JavaScript-to-TypeScript conversion
- ✦Adds interfaces, generics and annotations
- ✦Instant, no-login use
- ✦Sample code and try-it examples
- ✦Many related converters (JSON, YAML, CSS, etc.)
- ✦Developer guides and cheatsheets
- ✦Head-to-head model comparison
- ✦Battle mode matchups
- ✦Public model leaderboard
- ✦Multi-file app generation
- ✦File uploads as input
- ✦Agent-first IDE experience
- ✦Autonomous planning and code execution
- ✦Integrated editor, terminal and browser control
- ✦Powered by Google's Gemini models
- ✦High-level developer supervision
Use cases
- →Migrating JS files to TypeScript
- →Adding types to legacy code
- →Learning TypeScript syntax
- →Quick one-off code conversions
- →Choosing the best coding model
- →Benchmarking AI code quality
- →Prototyping small apps
- →Building apps with AI agents
- →Automating multi-step coding tasks
- →Prototyping and iterating on software
- →Assisting developers on complex work
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