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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
Hume AI
A
Perplexity
S
Gemini
A
TaglineOne API, every model. Pay-as-you-go, no subscriptions.Voice AI that reads + expresses emotion.AI search done right. Cited answers, not chat theater.Google's answer. Best integrated with Workspace + free for a lot.
CategoryDev PlatformVoiceResearchChatbots
PricingPay per token — model-dependentFree tier + pay-as-you-goFree + $20/mo ProFree + $20/mo Advanced (bundled with 2TB Drive)
Best forDevelopers experimenting across models. Apps that want fallback logic.Therapy apps, customer service, any voice agent where emotion matters.Replacing Google for any question where you want a cited answer in seconds.Anyone already on Google, research tasks, summarizing long documents.
Strengths
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Detects + mirrors emotional tone
  • EVI (Empathic Voice Interface) feels different
  • Expressive voice output
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
Weaknesses
  • Slight markup over direct API
  • Some provider features not exposed
  • Niche use case
  • Pricing ramps fast
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
Kai's verdictS-tier for model-shopping. I use this for every prototype before committing.A-tier in its niche. The only one that actually gets emotion right.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.
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