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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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S
Fireflies
A
Devin
A
Lex
A
TaglineRun any open-source AI model with an API call.Sales-focused meeting AI with CRM integration.Cognition Labs' autonomous coding engineer.Google Docs with an AI collaborator baked in.
CategoryDev PlatformMeetingsAgentsWriting
PricingPay per second of computeFree + $10-$19/user/mo$500/moFree + $12/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Sales teams, customer success, anyone running many discovery calls.Engineering teams offloading tickets. Ops/platform work.Essays, long-form drafts, thinking on the page.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Good CRM integrations (Salesforce, HubSpot)
  • Talk-time + sentiment analytics
  • Call scoring
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Bot-joins (intrusive)
  • Gets expensive at team scale
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier for sales teams. B-tier for solo users.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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