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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
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Data
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Education
OpenRouter
S
Rows
A
Grammarly
A
Jasper
B
TaglineOne API, every model. Pay-as-you-go, no subscriptions.Spreadsheets with AI + live integrations baked in.Grammar check + tone + AI drafting, everywhere you type.Marketing-first AI writing. Brand voice + campaign tools.
CategoryDev PlatformDataWritingMarketing
PricingPay per token — model-dependentFree + $19-$89/user/moFree + $12-$15/mo Premium + team plans$49-$129/mo
Best forDevelopers experimenting across models. Apps that want fallback logic.Ops teams, marketers, anyone building dashboards from multiple sources.Non-native English writers, business email, anyone who types a lot.Marketing teams that need brand-consistent output at scale.
Strengths
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Pull live data from Stripe, Slack, Google Analytics, etc.
  • AI functions inside cells
  • Modern UX
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Brand voice memory + guidelines
  • Templates for every marketing channel
  • Team-grade content review
Weaknesses
  • Slight markup over direct API
  • Some provider features not exposed
  • Not a full Excel replacement for heavy users
  • Integrations best on paid tiers
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Pricey vs Claude/ChatGPT
  • Less flexible than raw chatbot
Kai's verdictS-tier for model-shopping. I use this for every prototype before committing.A-tier. The most interesting spreadsheet in years. Great for ops dashboards.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.B-tier for individuals — Claude does this for less. A-tier for teams needing brand consistency.
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