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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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Stable Audio
A
Replicate
S
Lex
A
TaglineStability AI's open audio model. Loops + SFX + background.Run any open-source AI model with an API call.Google Docs with an AI collaborator baked in.
CategoryAudioDev PlatformWriting
PricingFree + $12/mo Pro + enterprisePay per second of computeFree + $12/mo
Best forGame developers, podcasters needing SFX, video creators needing background music.Developers using open-source models (Flux, SDXL, Whisper, etc).Essays, long-form drafts, thinking on the page.
Strengths
  • Open-weight model available
  • Great for loops + game audio + SFX
  • Commercial-use clarity
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • Not for full songs with vocals
  • Shorter generation limits
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
Kai's verdictA-tier for its niche. Different use case than Suno — SFX and loops, not songs.S-tier for open-source model APIs. The default in this space.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
LinkOpen →Open →Open →