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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
Cartesia
S
Qwen
A
TaglineCodeium's agentic IDE. Cascade agent + strong free tier.Ultra-low-latency voice. Built for realtime agents.Alibaba's open chat model. Multilingual + agentic.
Categorycodingvoicechat
PricingFree + $15/mo ProFree tier + usage-based APIFree web + API
Best forDevelopers who want Cursor-like power for less money.Developers building voice agents, phone bots, interactive apps.Vietnamese/Chinese content, SEA multilingual use, developers wanting open-weight tool-use.
Strengths
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • Excellent Chinese + Vietnamese + SEA languages
  • Strong at tool-use + agentic workflows
  • Open weights (Qwen2.5, Qwen3)
Weaknesses
  • Smaller community
  • Model selection more limited
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • English quality behind Claude/GPT
  • Less well-known outside Asia
Kai's verdictA-tier. Close second to Cursor. If $5/mo matters, start here.S-tier for realtime. If latency matters more than voice catalog, start here.A-tier. The best open model for Vietnamese + Chinese. Don't sleep on it if you work in SEA.
LinkOpen →Open →Open →