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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
Writesonic
B
Perplexity
S
Claude Agent SDK
S
Manus
S
TaglineSEO-first AI writer. Optimized for ranking content.AI search done right. Cited answers, not chat theater.Anthropic's SDK for building your own agents on Claude.Autonomous AI agent that actually finishes tasks.
CategoryMarketingResearchAgentsAgents
PricingFree + $15-$99/moFree + $20/mo ProAPI usage + SDK is freeFree tier + $39-$199/mo
Best forContent marketers churning out SEO articles.Replacing Google for any question where you want a cited answer in seconds.Developers building custom agents for their own company/product.People who want to hand off tasks entirely — trip planning, research, spreadsheet building.
Strengths
  • SEO built-in (Surfer integration)
  • Article generator for long-form
  • Chatsonic for research
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • General-purpose agent — research, book, build, analyze
  • Parallel task execution
  • Web browsing + file creation + coding
Weaknesses
  • Output quality behind Claude for polish
  • SEO automation can produce generic content
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Developer-only
  • You build the UI
  • Still hit-or-miss on complex multi-hour tasks
  • Can burn credits fast
Kai's verdictB-tier. Use Claude + manual SEO thinking. Writesonic is fast but generic.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.S-tier for builders. The right primitives. What Kai is built on under the hood.S-tier in the agent category. The first one I'd give to a non-technical friend.
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