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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
Ideogram
S
HeyGen
S
Runway
S
TaglineRun any open-source AI model with an API call.The one that actually gets text in images right.AI avatar videos. Record once, speak any language.The pro's AI video tool. Gen-4 is the current bar.
Categorydev platformimagevideovideo
PricingPay per second of computeFree + $8/mo + $20/mo + $60/moFree + $24-$65/moFree + $15-$95/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Anything with text — posters, ads, album covers, slide decks.Course creators, multilingual marketers, anyone scaling video content.Marketing video, pitch decks, b-roll, creative shorts.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Best text rendering in the game
  • Strong free tier
  • Good for logos, posters, thumbnails
  • Clone your face + voice in 2 minutes
  • Instant translation into 40+ languages with lip sync
  • Avatars look less uncanny than competitors
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Aesthetic ceiling below Midjourney
  • Less style variety
  • Pricey for serious volume
  • Long shots still feel off
  • Ethics — easy to misuse
  • Expensive at scale
  • Still needs post-editing
Kai's verdictS-tier for open-source model APIs. The default in this space.S-tier for text-in-image. Use this for posters, Midjourney for art.S-tier for multilingual video. If you sell courses or speak at events, this is a cheat code.S-tier. Market leader with reason. Start here for serious video.
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