Mastra
YC W25 · Active · The Javascript framework for building AI agents, from the Gatsby devs
Competitors
| Company | Category | Status | Program |
|---|---|---|---|
 VocodeShared: open sourceAcquiredAI, Devtools | AI, Devtools | Acquired | YCW23 |
 DAGWorks Inc.Shared: open source, framework, agentAcquiredAI, Devtools | AI, Devtools | Acquired | YCW23 |
 TwentyShared: open source, buildingActiveDevtools | Devtools | Active | YCS23 |
 AdenShared: open source, framework, agentActiveAI, Devtools | AI, Devtools | Active | YCW20 |
Adjacent
| Company | Category | Status | Program |
|---|---|---|---|
 BunShared: open source, javascript, typescriptAcquiredDevtools | Devtools | Acquired | YCS19 |
 WebinyShared: open source, framework, buildingActiveDevtools | Devtools | Active | YCW21 |
 nao LabsShared: open source, framework, agentActiveAI, Data, Devtools | AI, Data, Devtools | Active | YCX25 |
 Trigger.devShared: open source, typescript, agentActiveAI, Devtools | AI, Devtools | Active | YCW23 |
 OpenIntShared: open source, integrationAcquiredAI, Data, Devtools | AI, Data, Devtools | Acquired | YCW23 |
Also from W25 in AI
All of W25| Company | Category | Status |
|---|---|---|
 CodevisorThe fastest native app for agentic engineering.ActiveAI, Devtools | AI, Devtools | Active |
 Confident AIThe LLM Eval and Observability Platform for AI QualityActiveAI, Devtools | AI, Devtools | Active |
 CorsairOpenRouter for IntegrationsActiveAI, Devtools | AI, Devtools | Active |
 SublingualDaily productivity trackerInactiveAI, Devtools | AI, Devtools | Inactive |
 a0.devWe make mobile apps using AI.ActiveAI, Devtools | AI, Devtools | Active |
 assistant-uiOpen Source React.js Library for AI ChatActiveAI, Devtools | AI, Devtools | Active |
Founders
- Sam BhagwatFounder/CEO
- Abhi AiyerFounder/CTO
- Shane ThomasFounder
About Mastra
Mastra is the easiest way to build a production AI application, built by the team that brought you Gatsby. We provide a complete set of AI primitives: workflows for complex operations, agents for autonomous decisions, RAG for knowledge integration, and evals for quality & accuracy. Mastra is open-source, modular, and built in Typescript for product developers. You can deploy Mastra on any cloud, and it gives you a straightforward syntax to solve the hardest problems building with AI: human-in-the-loop workflows, agent memory and tool selection, and output quality.
- YC batch
- W25 · Winter 2025
- Status, per YC
- Active
- Category
- AI, Developer tools
- Team size
- 30
- Location
- San Francisco, CA, USA; Remote
- Founded
- 2024
- Checked
- 33m ago
YC tags: Artificial Intelligence, Developer Tools, Open Source, AI
Mastra: questions
Which YC batch was Mastra in?
Mastra was in Y Combinator's Winter 2025 batch (W25).
Is Mastra still active?
Y Combinator lists Mastra as active.
Who founded Mastra?
Mastra's founders, as listed on its YC page: Sam Bhagwat (Founder/CEO), Abhi Aiyer (Founder/CTO), Shane Thomas (Founder).
Where is Mastra based?
Mastra lists San Francisco, CA, USA; Remote as its location on YC's directory.
Sources: each program's public company list, read twice a week. Not affiliated with Y Combinator or any other program. Logos via logo.dev; trademarks belong to their owners.