Best alternatives to Mastra (2026)
15 verified ai agents alternatives to Mastra, machine-checked for live status, real pricing, and genuine free tiers.
| Tool | Free tier | API | Freshness | Key difference |
|---|---|---|---|---|
| CassidyFreemium | — | — | 100 | AI assistants on your company data. |
| Stack AIFreemium | — | ✓ | 100 | Offers an API |
| SimFreemium | ✓ | ✓ | 100 | Open source |
| BhindiFreemium | ✓ | — | 100 | Verified free tier |
| Relay.appFreemium | ✓ | ✓ | 100 | Verified free tier |
| ManusFreemium | — | — | 100 | General autonomous AI agent. |
| DelphiSubscription | — | — | 100 | Subscription pricing |
| CrewAIOpen source | — | ✓ | 100 | Open source |
| LindyFreemium | — | — | 100 | Build AI assistants for work. |
| Relevance AIFreemium | ✓ | ✓ | 100 | Verified free tier |
| ActivepiecesOpen source | — | ✓ | 100 | Open source |
| DialogflowUsage-based | — | ✓ | 100 | Offers an API |
| BardeenFreemium | ✓ | — | 100 | Verified free tier |
| PipedreamFreemium | — | ✓ | 100 | Offers an API |
| GumloopFreemium | — | ✓ | 100 | Offers an API |