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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
HeyGen
S
Gemini
A
Replicate
S
TaglineDuolingo + AI. Explain My Answer + Roleplay features.AI avatar videos. Record once, speak any language.Google's answer. Best integrated with Workspace + free for a lot.Run any open-source AI model with an API call.
CategoryEducationVideoChatbotsDev Platform
Pricing$30/mo (or ~$168/yr)Free + $24-$65/moFree + $20/mo Advanced (bundled with 2TB Drive)Pay per second of compute
Best forLanguage learners who've outgrown basic Duolingo.Course creators, multilingual marketers, anyone scaling video content.Anyone already on Google, research tasks, summarizing long documents.Developers using open-source models (Flux, SDXL, Whisper, etc).
Strengths
  • Explain My Answer = personal tutor for every mistake
  • Roleplay = real conversation practice
  • Gamification that actually sticks
  • Clone your face + voice in 2 minutes
  • Instant translation into 40+ languages with lip sync
  • Avatars look less uncanny than competitors
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
Weaknesses
  • Pricey vs free Duolingo
  • Conversation AI still stiff sometimes
  • Pricey for serious volume
  • Long shots still feel off
  • Ethics — easy to misuse
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Cold starts on less-popular models
  • Pricing gets real at scale
Kai's verdictA-tier. If you already love Duolingo, worth it. If starting fresh, try ChatGPT Voice instead.S-tier for multilingual video. If you sell courses or speak at events, this is a cheat code.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.S-tier for open-source model APIs. The default in this space.
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