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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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OpenRouter
S
Writesonic
B
Stable Audio
A
TaglineOne API, every model. Pay-as-you-go, no subscriptions.SEO-first AI writer. Optimized for ranking content.Stability AI's open audio model. Loops + SFX + background.
CategoryDev PlatformMarketingAudio
PricingPay per token — model-dependentFree + $15-$99/moFree + $12/mo Pro + enterprise
Best forDevelopers experimenting across models. Apps that want fallback logic.Content marketers churning out SEO articles.Game developers, podcasters needing SFX, video creators needing background music.
Strengths
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • SEO built-in (Surfer integration)
  • Article generator for long-form
  • Chatsonic for research
  • Open-weight model available
  • Great for loops + game audio + SFX
  • Commercial-use clarity
Weaknesses
  • Slight markup over direct API
  • Some provider features not exposed
  • Output quality behind Claude for polish
  • SEO automation can produce generic content
  • Not for full songs with vocals
  • Shorter generation limits
Kai's verdictS-tier for model-shopping. I use this for every prototype before committing.B-tier. Use Claude + manual SEO thinking. Writesonic is fast but generic.A-tier for its niche. Different use case than Suno — SFX and loops, not songs.
LinkOpen →Open →Open →