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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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Replicate
S
Lex
A
Pika
A
Suno
S
TaglineRun any open-source AI model with an API call.Google Docs with an AI collaborator baked in.The playful, accessible AI video tool.Prompt to full song with vocals, instruments, the works.
CategoryDev PlatformWritingVideoAudio
PricingPay per second of computeFree + $12/moFree + $8-$58/moFree + $10/mo + $30/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Essays, long-form drafts, thinking on the page.Social media creators, beginners, anyone wanting quick fun clips.Jingles, intros, demos, sketches, personal use.
Strengths
  • 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
  • Ingredients feature — combine people, objects, scenes
  • Lip sync + sound effects
  • Fun, approachable UX
  • Real songs with real lyrics
  • v4 is very good
  • Quick turnaround
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Lower fidelity than Runway/Kling
  • Still rough on complex scenes
  • Copyright gray zone
  • Audio quality behind studio
Kai's verdictS-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.A-tier for social/casual. B-tier for serious work. Good entry point.S-tier in its category. The first AI music tool I'd actually listen to.
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