Microsoft Copilot Studio vs Cassidy vs Stack AI vs Sim
Side-by-side comparison of 4 verified tools.
Microsoft Copilot StudioCassidyStack AISim
| Microsoft Copilot Studio Build custom AI agents across Microsoft 365. | Cassidy AI assistants on your company data. | Stack AI No-code AI agent builder. | Sim Open-source agent workflow builder. | |
|---|---|---|---|---|
| Pricing | Subscription | Freemium | Freemium | Freemium |
| Verified free tier | — | — | — | — |
| API | ✓ | — | ✓ | ✓ |
| Open source | — | — | — | ✓ |
| Rating | — | — | — | — |
| Freshness | 0/100 | 0/100 | 0/100 | 0/100 |
| Platforms | web, api | web | web, api | web, api |
| Languages | en | en | en | en |
| Categories | AI Agents | AI Agents | AI Agents | AI Agents |
| Visit | Open ↗ | Open ↗ | Open ↗ | Open ↗ |