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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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Streamdown
✓ verifiedFree
Open-source drop-in replacement for react-markdown built to render streaming AI chatbot markdown smoothly and safely.
23K visits/mo
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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
✕
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
- ✦Streaming caret animation while content is still generating
- ✦Graceful parsing/styling of incomplete markdown blocks
- ✦GitHub Flavored Markdown support (tables, task lists, strikethrough)
- ✦Shiki-powered code blocks with copy/download buttons and language detection
- ✦Optional plugins for KaTeX math, Mermaid diagrams, and CJK typography
- ✦Security hardening that blocks unexpected image/link origins
- ✦Customizable, overridable components and styling
- ✦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
- →Building AI chat interfaces that render streamed markdown responses
- →Displaying syntax-highlighted code in chatbot answers
- →Rendering math equations or diagrams generated by an AI model
- →Swapping out react-markdown in an existing app with minimal changes
- →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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