KaiAI tutor for anyone

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Side-by-side: what they do, what they cost, what Kai actually thinks. Pass up to 4 tools via ?tools=claude,chatgpt,gemini.
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Cline
A
OpenRouter
S
Claude Code
S
Bolt.new (StackBlitz)
A
TaglineOpen-source VS Code agent. Reads + writes + runs.One API, every model. Pay-as-you-go, no subscriptions.Anthropic's CLI agent. Opus-powered, operates on your repo directly.Prompt to deployed full-stack app in the browser.
CategoryCodingDev PlatformCodingCoding
PricingFree (open source) + your API costsPay per token — model-dependentPart of Claude Pro/Max/Team plansFree + $20-$200/mo
Best forVS Code users who want agentic coding without changing IDEs.Developers experimenting across models. Apps that want fallback logic.Developers who want an agent, not autocomplete. Large refactors, tests, docs.PMs, founders, non-devs shipping MVPs.
Strengths
  • Free extension for VS Code
  • Plan + Act modes
  • Model-agnostic (Claude, GPT, local)
  • Sees terminal output and iterates
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • Full-stack generation + live preview
  • Deploy to Netlify in one click
  • Works in-browser — no install
Weaknesses
  • Can burn tokens fast if not watched
  • Less polished than Cursor
  • Slight markup over direct API
  • Some provider features not exposed
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Quality ceiling for complex apps
  • Can get into loops for non-trivial bugs
Kai's verdictA-tier. Best free agentic option in VS Code. Use with Claude for best results.S-tier for model-shopping. I use this for every prototype before committing.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.A-tier. Best for fast prototypes. Competitive with Lovable — try both.
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