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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
Grammarly
A
Rows
A
Writesonic
B
TaglineOne API, every model. Pay-as-you-go, no subscriptions.Grammar check + tone + AI drafting, everywhere you type.Spreadsheets with AI + live integrations baked in.SEO-first AI writer. Optimized for ranking content.
CategoryDev PlatformWritingDataMarketing
PricingPay per token — model-dependentFree + $12-$15/mo Premium + team plansFree + $19-$89/user/moFree + $15-$99/mo
Best forDevelopers experimenting across models. Apps that want fallback logic.Non-native English writers, business email, anyone who types a lot.Ops teams, marketers, anyone building dashboards from multiple sources.Content marketers churning out SEO articles.
Strengths
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Pull live data from Stripe, Slack, Google Analytics, etc.
  • AI functions inside cells
  • Modern UX
  • SEO built-in (Surfer integration)
  • Article generator for long-form
  • Chatsonic for research
Weaknesses
  • Slight markup over direct API
  • Some provider features not exposed
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Not a full Excel replacement for heavy users
  • Integrations best on paid tiers
  • Output quality behind Claude for polish
  • SEO automation can produce generic content
Kai's verdictS-tier for model-shopping. I use this for every prototype before committing.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.A-tier. The most interesting spreadsheet in years. Great for ops dashboards.B-tier. Use Claude + manual SEO thinking. Writesonic is fast but generic.
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