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S
Duolingo Max
A
Stable Audio
A
TaglineRun any open-source AI model with an API call.Duolingo + AI. Explain My Answer + Roleplay features.Stability AI's open audio model. Loops + SFX + background.
CategoryDev PlatformEducationAudio
PricingPay per second of compute$30/mo (or ~$168/yr)Free + $12/mo Pro + enterprise
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Language learners who've outgrown basic Duolingo.Game developers, podcasters needing SFX, video creators needing background music.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Explain My Answer = personal tutor for every mistake
  • Roleplay = real conversation practice
  • Gamification that actually sticks
  • Open-weight model available
  • Great for loops + game audio + SFX
  • Commercial-use clarity
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Pricey vs free Duolingo
  • Conversation AI still stiff sometimes
  • Not for full songs with vocals
  • Shorter generation limits
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier. If you already love Duolingo, worth it. If starting fresh, try ChatGPT Voice instead.A-tier for its niche. Different use case than Suno — SFX and loops, not songs.
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