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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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Dev Platform
Agents
Voice
Video
Audio
Research
Coding
Chatbots
Image
Meetings
Design
Productivity
Writing
Data
Marketing
Education
Fathom
S
Kling
A
Claude Agent SDK
S
Perplexity
S
TaglineMeeting notes, free forever for individuals.Kuaishou's video model. The surprise standout.Anthropic's SDK for building your own agents on Claude.AI search done right. Cited answers, not chat theater.
CategoryMeetingsVideoAgentsResearch
PricingFree for individuals + $15-$29/user/mo teamsCredit-based, free trialAPI usage + SDK is freeFree + $20/mo Pro
Best forSolo operators, freelancers, small teams on a budget.Anyone who wants top-tier video quality for less.Developers building custom agents for their own company/product.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Unlimited free tier for solo use
  • Strong summaries + action items
  • Works in Zoom, Meet, Teams
  • Very strong motion + physics
  • Often beats Runway on realism
  • Great price
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Bot-joining model
  • Team features gated
  • UX is rough for English speakers
  • Queue times
  • Developer-only
  • You build the UI
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictS-tier for solo + free. The best free option, hands down.A-tier. Rising fast. If you can tolerate the UX, quality per dollar is best-in-class.S-tier for builders. The right primitives. What Kai is built on under the hood.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.
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