CopilotKit vs Mastra
CopilotKit and Mastra are both agent frameworks. CopilotKit is published by CopilotKit and Mastra by Mastra. On GitHub, CopilotKit has 38,211 stars and Mastra has 29,050. Both were last active in Oct 2026. The table lines up where they differ (publisher, weekly downloads and category) and has the install commands for both. Everything here comes from the listings' public sources and is refreshed daily. CopilotKit describes itself as: Open-source SDK that connects AI agents to app front ends with chat UI, generative UI, shared state and human approvals; creator of the AG-UI protocol. Mastra: TypeScript framework for AI agents and apps with graph-based workflows, memory, suspend-and-resume approvals, MCP servers and model routing. Licenses: CopilotKit MIT, Mastra unknown.
Updated Oct 26, 2026 · Built from catalog data; how we rank and grade
CopilotKit
CopilotKit
Open-source SDK that connects AI agents to app front ends with chat UI, generative UI, shared state and human approvals; creator of the AG-UI protocol.
Mastra
Mastra
TypeScript framework for AI agents and apps with graph-based workflows, memory, suspend-and-resume approvals, MCP servers and model routing.
Who should pick which
- Pick Mastra if you want a stable release (CopilotKit is marked beta).
From listing data only. We don't pick a winner on security beyond the grades; read how grades work.
Side by side
| Fact | CopilotKit | Mastra |
|---|---|---|
| Type | Harness | Harness |
| Publisher | CopilotKit | Mastra |
| License | MIT | License unknown |
| Pricing | Not stated | Not stated |
| Runs | Not stated | Not stated |
| Auth | Not stated | Not stated |
| Hosts supported | Not stated | Not stated |
| Tools | Not listed yet | Not listed yet |
| Security grade | –Security: not graded yet | –Security: not graded yet |
| Freshness grade | AFreshness: A | AFreshness: A |
| GitHub stars | 38,211 | 29,050 |
| Weekly downloads | 286,211 | 1,442,185 |
| Last release | Oct 16, 2026 | Oct 21, 2026 |
| Last activity | Oct 24, 2026 | Oct 24, 2026 |
Facts from each listing's public sources, checked daily. Tool lists arrive with tool scans.
Install
CopilotKit
npm install @copilotkit/react-core
Mastra
npm install @mastra/core
Also consider
- 0.867score
Pi Agent Core
Earendil
Minimal TypeScript agent harness with an agent runtime, multi-provider LLM API, terminal UI and coding agent CLI that users extend themselves.
HarnessAFreshness: A★ 117.6K↓ 5.1M/wk - 0.799score
Letta
Letta
Open-source agent harness for stateful agents whose memory persists and improves with use, with a terminal UI, app server and TypeScript SDK.
HarnessAFreshness: A★ 25.2K↓ 40.7K/wk - 0.787score
trueforge
truefoundry
Open-source agent harness that runs the model loop for you, with MCP tools, skills, sandboxing, approvals and a chat UI.
HarnessAFreshness: A★ 6.4K
Questions
- Is CopilotKit or Mastra more popular?
- CopilotKit has more GitHub stars (38,211 against 29,050). Stars measure attention, not quality, so check freshness and docs too.
- Are CopilotKit and Mastra open source?
- CopilotKit is open source (MIT); the other is unknown.
Related
Cite this page
CopilotKit vs Mastra. Agent Mart. https://agentmart.dev/compare/copilotkit-vs-mastra (last updated 2026-10-26)