M91 vs REX
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 REX
| Detail | 
M91 | 
REX |
|---|
| What it does | Human-in-the-loop approval for AI agents
| A coding agent that runs your whole Windows PC by voice or text
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| Stage | Not given
| Not given
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| Founded | Not given
| Not given
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| Based in | Not given
| ES
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| Pricing model | Free
| Free
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| Pricing | Free forever with all features included
| Free. Windows 10 or later, 64-bit.
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| 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
| - Verifies results before completion
- Voice and text input
- Runs on Windows 10 or later, 64-bit
- Compatible with any AI model you choose
- Multi-step task automation
- Checks live results in real applications
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| 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
| - Operates the entire Windows desktop, not just the terminal
- Verifies task completion by checking real application results
- Completely free with no subscription required
- Voice control for hands-free operation
- Measured performance on public benchmarks
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 73 ● no change since last check | 2 ● no change since last check |
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| Trust Flow (Majestic) | 1 | 2 |
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| Citation Flow (Majestic) | 1 | 24 |
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| Referring domains (Majestic) | 0 | 15 |
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5 details filled in for both companies.
More alternatives to M91 More alternatives to REX