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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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Windsurf
A
Manus
S
Cartesia
S
TaglineCodeium's agentic IDE. Cascade agent + strong free tier.Autonomous AI agent that actually finishes tasks.Ultra-low-latency voice. Built for realtime agents.
Categorycodingagentsvoice
PricingFree + $15/mo ProFree tier + $39-$199/moFree tier + usage-based API
Best forDevelopers who want Cursor-like power for less money.People who want to hand off tasks entirely — trip planning, research, spreadsheet building.Developers building voice agents, phone bots, interactive apps.
Strengths
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
  • General-purpose agent — research, book, build, analyze
  • Parallel task execution
  • Web browsing + file creation + coding
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
Weaknesses
  • Smaller community
  • Model selection more limited
  • Still hit-or-miss on complex multi-hour tasks
  • Can burn credits fast
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
Kai's verdictA-tier. Close second to Cursor. If $5/mo matters, start here.S-tier in the agent category. The first one I'd give to a non-technical friend.S-tier for realtime. If latency matters more than voice catalog, start here.
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