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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
GitHub Copilot
B
Gemini
A
Perplexity
S
TaglineOpen-source VS Code agent. Reads + writes + runs.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Google's answer. Best integrated with Workspace + free for a lot.AI search done right. Cited answers, not chat theater.
Categorycodingcodingchatresearch
PricingFree (open source) + your API costsFree (limited) + $10/mo Pro + $19/mo BusinessFree + $20/mo Advanced (bundled with 2TB Drive)Free + $20/mo Pro
Best forVS Code users who want agentic coding without changing IDEs.Teams with GitHub already. Devs who don't want to change IDEs.Anyone already on Google, research tasks, summarizing long documents.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Free extension for VS Code
  • Plan + Act modes
  • Model-agnostic (Claude, GPT, local)
  • Sees terminal output and iterates
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Can burn tokens fast if not watched
  • Less polished than Cursor
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictA-tier. Best free agentic option in VS Code. Use with Claude for best results.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.
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