CopilotKit vs Mastra
Which Agents AI tool is better in 2026?
CopilotKit
Open-source framework for building in-app AI copilots and agentic UIs
Mastra
The open-source TypeScript framework for building AI agents
Side-by-side
CopilotKit is the more established option (raised $27M); pricing is comparable on both sides.
| Metric | CopilotKit | Mastra |
|---|---|---|
| Taglinei | Open-source framework for building in-app AI copilots and agentic UIs | The open-source TypeScript framework for building AI agents |
| Foundedi | 2023🏆 | 2024 |
| HQi | Seattle, US | San Francisco, US |
| Employeesi | 11-50 | 11-50 |
| Neuron scorei | 68 | 71🏆 |
| Total fundingi | $27M🏆 | $13M |
| Latest roundi | Series A · May 2026 | Seed · Oct 2025 |
| Valuationi | — | — |
| Cheapest paid plani | Pricing not disclosed | Pricing not disclosed |
| Free plani | ✓ | ✓ |
| Free triali | ✗ | ✗ |
| Top tier pricei | Pricing not disclosed | Pricing not disclosed |
| Pricing summaryi | Open source | Open source |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for CopilotKit and Mastra.
| Capability | CopilotKit | Mastra |
|---|---|---|
| MCP support | ✗ | ✓ |
| Public API | ✓ | ✓ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✓ | ✓ |
| Free trial | ✗ | ✗ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of CopilotKit
- Has raised more capital ($27M vs $13M)
- More mature (2023)
🔵 Strengths of Mastra
- Higher Neuron score (71 vs 68)
- Newer company (2024)
Which should you choose?
Choose Mastra if price matters most — it starts at Open source, which is friendlier for teams watching burn. Both AI Agents tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose CopilotKit if you want the most established option — it has raised $27M, suggesting more runway for enterprise features, support, and long-term roadmap. For mission-critical workflows or larger teams, that stability often outweighs a lower monthly price.
Frequently asked questions
CopilotKit vs Mastra — which is better?
It depends on your priority. CopilotKit has raised more capital and is the more established option; Mastra has broader feature depth. See the side-by-side table above.
Is CopilotKit cheaper than Mastra?
No — Mastra's cheapest paid plan is Open source, while CopilotKit's is Open source.
Do CopilotKit and Mastra offer free plans?
CopilotKit: Yes, has a free plan. Mastra: Yes, has a free plan.
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