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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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MarsCode
✓ verifiedFree
AI-powered IDE with code completion, generation, explanation and debugging, plus a cloud dev environment, for developers.
69K visits/mo
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The New GitBook
✓ verifiedFreemium
Documentation platform for publishing accurate, AI-ready docs sites, with Git sync and an MCP server for AI tools.
653K visits/mo2.9K saves
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Theneo
✓ verifiedFreemium
AI-assisted API documentation platform for teams to co-author, generate, and maintain developer portals.
46K visits/mo3.4K saves
Pricing
No public pricing
No public pricing
Free trial available
No public pricing
Business: $120/mo per workspace (up to 7 projects, 50 members)
Growth: $400/mo per workspace (up to 20 developer hubs)
Core features
- ✦AI code completion and snippet generation
- ✦Natural-language code generation
- ✦Code explanation and AI Q&A
- ✦Automated bug detection and fixes
- ✦Zero-config cloud development environment
- ✦Project creation from templates or Git
- ✦Publish structured documentation sites
- ✦Git sync for docs-as-code workflows
- ✦AI setup agent to build and import docs
- ✦GitBook MCP server for AI access
- ✦Enterprise controls
- ✦Free tier to start
- ✦Natural language to SQL conversion
- ✦Auto-generated API documentation from OpenAPI/other specs
- ✦Real-time collaborative editing for docs
- ✦AI 'Ask AI' chatbot for developer questions
- ✦Automatic changelog generation with breaking-change detection
- ✦Private, authenticated developer portals per customer
- ✦MCP server and llms.txt support for AI agents
- ✦SOC 2 and ISO 27001 compliance for enterprise
Use cases
- →Writing and completing code faster with AI
- →Onboarding to unfamiliar codebases
- →Debugging and optimizing code
- →Spinning up dev environments in the browser
- →Publish product and API documentation
- →Maintain docs-as-code with Git sync
- →Make docs consumable by AI assistants
- →Import existing docs into a hosted site
- →Generating SQL queries from text descriptions.
- →Generate and maintain API reference docs automatically
- →Give customers a branded, authenticated developer portal
- →Let engineers and writers co-edit documentation in real time
- →Provide an AI chatbot so developers can ask questions about an API
- →Track and flag breaking API changes automatically
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