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M91 vs MarStack

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

M91 compared with MarStack
DetailM91 logo M91MarStack logo MarStack
What it doesHuman-in-the-loop approval for AI agents Analytics expert and auditor inside Claude that checks GA4, Google Tag Manager, consent, Meta and Google Ads with 167 expert rules and answers business questions across your marketing data.
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelFree Not given
PricingFree forever with all features included Free: 100 credits (no card required). Starter: $19/month for 1,000 credits. Pro: $49/month for 5,000 credits. Agency: $149/month for 30,000 credits. Individual tool calls cost 1-10 credits depending on complexity.
Key features
  • Alerts on iPhone and Android with answer buttons
  • Phone call escalation for high and critical alerts
  • Breaks through silent mode and Do Not Disturb
  • Attachments and notes on every alert
  • Broadcast to a channel with one person taking ownership
  • See who acted and who ignored alerts
  • Answer buttons set by you or your AI
  • Callback webhooks to return answers to your code
  • Setup via pasted prompt or API key-free send link
  • Integration with AI frameworks, automation platforms and HTTP API
  • GA4 property audits with 89 expert checks
  • Real-browser page tracking inspection and validation
  • Live conversion testing with form submission
  • Business intelligence across GA4, Meta, Search Console and CRM
  • Branded report generation in Excel, Word, PDF and PowerPoint
  • Integration with Claude, Cursor and VS Code via MCP
What makes it different
  • Full-volume alerts that interrupt even when phone is silenced
  • No SDK, API key or card required to start
  • Free forever with every feature for every team member
  • Escalates to phone calls for critical alerts that go unanswered
  • Works with existing AI agents, workflows and monitoring tools
  • Real-browser proof of tracking, not config checks alone
Community votes00
DR (Domain Rating by Ahrefs)73 no change since last checkNot checked yet no change since last check
Trust Flow (Majestic)10
Citation Flow (Majestic)18
Referring domains (Majestic)04

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