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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.
Pick tools (4 selected)
Dev Platform
Audio
Research
Agents
Coding
Chatbots
Image
Video
Voice
Meetings
Design
Productivity
Writing
Data
Marketing
Education
Reflect
A
OpenRouter
S
Rows
A
Le Chat (Mistral)
B
TaglineAI-powered networked notes. Roam with a brain.One API, every model. Pay-as-you-go, no subscriptions.Spreadsheets with AI + live integrations baked in.French alternative. Fast, European, privacy-focused.
CategoryProductivityDev PlatformDataChatbots
Pricing$10/moPay per token — model-dependentFree + $19-$89/user/moFree + $15/mo Pro
Best forKnowledge workers + thinkers who want AI in their second brain.Developers experimenting across models. Apps that want fallback logic.Ops teams, marketers, anyone building dashboards from multiple sources.European users with data residency needs. Fans of open-weight models.
Strengths
  • AI auto-links related notes
  • Generates backlinks + summaries
  • Clean, minimal UX
  • 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
  • European data residency
  • Very fast responses
  • Open-weight Mistral models available
  • Good French/European languages
Weaknesses
  • Expensive for just notes
  • Smaller community than Obsidian
  • Slight markup over direct API
  • Some provider features not exposed
  • Not a full Excel replacement for heavy users
  • Integrations best on paid tiers
  • Smaller capability gap vs frontier models
  • Less polished UX
Kai's verdictA-tier. Niche but beloved. If you've outgrown Notion, try this.S-tier for model-shopping. I use this for every prototype before committing.A-tier. The most interesting spreadsheet in years. Great for ops dashboards.B-tier overall, A-tier if GDPR/data residency matters. Solid backup option.
LinkOpen →Open →Open →Open →