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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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Duolingo Max
A
Replicate
S
Groq
S
HeyGen
S
TaglineDuolingo + AI. Explain My Answer + Roleplay features.Run any open-source AI model with an API call.The fastest AI inference in the world. Crazy low latency.AI avatar videos. Record once, speak any language.
CategoryEducationDev PlatformDev PlatformVideo
Pricing$30/mo (or ~$168/yr)Pay per second of computeFree tier + pay-as-you-go APIFree + $24-$65/mo
Best forLanguage learners who've outgrown basic Duolingo.Developers using open-source models (Flux, SDXL, Whisper, etc).Developers who need sub-100ms LLM responses.Course creators, multilingual marketers, anyone scaling video content.
Strengths
  • Explain My Answer = personal tutor for every mistake
  • Roleplay = real conversation practice
  • Gamification that actually sticks
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • Clone your face + voice in 2 minutes
  • Instant translation into 40+ languages with lip sync
  • Avatars look less uncanny than competitors
Weaknesses
  • Pricey vs free Duolingo
  • Conversation AI still stiff sometimes
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Pricey for serious volume
  • Long shots still feel off
  • Ethics — easy to misuse
Kai's verdictA-tier. If you already love Duolingo, worth it. If starting fresh, try ChatGPT Voice instead.S-tier for open-source model APIs. The default in this space.S-tier for speed. When latency is the product, start here.S-tier for multilingual video. If you sell courses or speak at events, this is a cheat code.
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