Mastra vs Vercel AI SDK
A side-by-side view of two listings from the BuildStack.ai AI agent harnesses directory, for software vendors and family-office technology buyers. Every value is copied from the listing data, verified (Asia/Singapore) from the sources linked below.
Summary
Mastra and Vercel AI SDK are both listed in AI agent harnesses. Of the 5 capabilities compared there, both document 5: Multi-agent, Durable state / resume, Human-in-the-loop, Tracing / observability, MCP support.
Their capability marks are identical, so the differences are in languages, license, hosting and the vendor notes shown in the table below.
Best fit, as stated in each listing — Mastra: TypeScript/JavaScript teams who want agents and workflows in the same stack as their web app. Vercel AI SDK: TypeScript/Next.js teams adding agents to web products.
Side-by-side comparison
✔ = documented by the vendor · ✕ = not offered / vendor says no · ? = not verified. Values are shown exactly as stored in the listing.
| Field | Mastra | Vercel AI SDK |
|---|---|---|
| Website | https://mastra.ai | https://ai-sdk.dev |
| Type | Open source + managed | Open source |
| Languages / SDKs | TypeScript (Node.js, Bun, Deno, Cloudflare) | TypeScript (Node.js; React, Next.js, Svelte, Vue, Angular UI integrations) |
| License | Apache-2.0 core; code in ee/ directories under the Mastra Enterprise License (GitHub reports NOASSERTION) | Apache-2.0 (per LICENSE file; GitHub reports NOASSERTION) |
| Hosting model | Self-host on any Node.js-compatible environment (Mastra server, web framework or cloud provider); Mastra platform for observability, Studio and serving | Self-hosted library |
| GitHub ★ | mastra-ai/mastra · ★ 28,917 (as of 2026-10-20) | vercel/ai · ★ 27,400 (as of 2026-10-20) |
| Multi-agent | ✔ | ✔ |
| Durable state / resume | ✔ | ✔ |
| Human-in-the-loop | ✔ | ✔ |
| Tracing / observability | ✔ | ✔ |
| MCP support | ✔ | ✔ |
| Description | TypeScript framework for AI applications and agents, with workflows, memory, evals, observability and a local Studio. | Provider-agnostic TypeScript toolkit from Vercel for AI applications and agents, with tool-loop agents, subagents and durable workflow agents. |
| Best fit | TypeScript/JavaScript teams who want agents and workflows in the same stack as their web app. | TypeScript/Next.js teams adding agents to web products. |
| Details | Supervisor agents that coordinate subagents; workflows with snapshots, suspend/resume, time travel and human-in-the-loop; traces, metrics and evals; MCPClient to consume MCP servers and MCPServer to expose agents, tools and workflows. | ToolLoopAgent and subagents a parent can delegate to; WorkflowAgent (@ai-sdk/workflow) for durable, resumable agents with automatic state persistence; tool execution approval (toolApproval); OpenTelemetry telemetry via @ai-sdk/otel; MCP tools. |
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Sources
Mastra sources
- https://github.com/mastra-ai/mastra
- https://mastra.ai/docs
- https://mastra.ai/docs/subagents
- https://mastra.ai/docs/workflows/suspend-and-resume
- https://mastra.ai/docs/observability/overview
- https://mastra.ai/docs/connections/mcp
- https://mastra.ai/docs/deployment/overview
- https://raw.githubusercontent.com/mastra-ai/mastra/main/LICENSE.md
- https://api.github.com/repos/mastra-ai/mastra
Vercel AI SDK sources
- https://github.com/vercel/ai
- https://ai-sdk.dev/docs/agents/overview
- https://ai-sdk.dev/docs/agents/subagents
- https://ai-sdk.dev/docs/agents/workflow-agent
- https://ai-sdk.dev/docs/ai-sdk-core/tools-and-tool-calling
- https://ai-sdk.dev/docs/ai-sdk-core/telemetry
- https://ai-sdk.dev/docs/ai-sdk-core/mcp-tools
- https://raw.githubusercontent.com/vercel/ai/main/LICENSE
- https://api.github.com/repos/vercel/ai
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This page is generated from the same listing data as the AI agent harnesses page; it adds no facts of its own. Capabilities are marked ✔ only when documented; “?” means we could not verify it, not that it is missing. Featured (paid) placement adds a Sponsored label only and never changes the facts or their order. Corrections: email the publisher.