Mastra vs Sierra
Mastra vs Sierra, compared side by side on 24 data points: what each one does, how big it is, what it has raised, the tech running each site, and what users report. We score both out of 100 on traction, team and visibility: Mastra is on 76/100 and Sierra on 62/100.
Where each one leads
Mastra
- our overall score: 76/100 against 62/100
- agent readiness: 58/100 against 50/100
Sierra
- headcount: 277 against 53
- funding raised: $1.6B against $35.5M
- LinkedIn following: 29,888 against 6,591
At a glance
| Measure | Mastra | Sierra |
|---|---|---|
| What it is | An open-source TypeScript/JavaScript framework for building AI agents, from the creators of Gatsby. | Sierra helps businesses build better, more human customer experiences with AI agents that can understand, reason, and take action across various channels. |
| Category | Agentic AI, AI Agents, Developer Tools, Open Source | Agentic AI, Conversational AI, Customer Service, AI Agents |
| Sells toBusiness model | B2B | B2B |
| Offering | Platform | Not published |
| Founded | 2024 | 2023 |
| Headquarters | San Francisco, United States | United States |
| Status | Active | Active |
Size, funding and growth
| Measure | Mastra | Sierra |
|---|---|---|
| Employees | 53 | 277 |
| Headcount growthLast 12 months | +204.5% | Not published |
| Total funding | $35.5M | $1.6B |
| Latest round | Series A | Growth |
| Valuation | Not published | $10K |
| LinkedIn followers | 6,591 | 29,888 |
StartupHub scores
Our own 0-100 ratings. They measure company strength and site quality, not which product suits you.
| Measure | Mastra | Sierra |
|---|---|---|
| StartupHub scoreOur 0-100 rating | 76/100 | 62/100 |
| Traction | 70/100 | 60/100 |
| Team | 90/100 | 50/100 |
| Community | 25/100 | 8/100 |
| Search visibility | 59/100 | 78/100 |
| Quality | 78/100 | 65/100 |
| Agent readinessHow well an AI agent can read and act on the site | D (58/100) | D (50/100) |
| Domain ratingLink authority, 0-100 | 76/100 | 73/100 |
Technology
Detected on each public site, so it reflects the marketing stack as well as the product.
| Measure | Mastra | Sierra |
|---|---|---|
| Hosting | Vercel | Vercel |
| CDN | Vercel | Cloudflare |
| CMS | Not detected | Ghost |
| Frameworks | Next.js, Tailwind CSS | Next.js, Tailwind CSS |
| Support stack | Not detected | HubSpot |
| Open source | Yes, 15,100 GitHub stars | No |
| Self-hostable | Yes | No |
Product and pricing
| Measure | Mastra | Sierra |
|---|---|---|
| Key features | AI Agent Framework, Workflows, RAG, Evals, Memory & Tool Selection, Open Source & Modular | AI Agent Deployment, Real-time Customer Support, Voice Communication Integration, Agent OS for Scalability, Actionable AI Integration, Robust Security & Compliance |
What users say
| Measure | Mastra | Sierra |
|---|---|---|
| Community ratingVisitor votes on StartupHub | 5.0/5 from 1 vote | Not published |
Mastra vs Sierra: common questions
Which is better, Mastra or Sierra?
On our 0-100 score Mastra rates higher (76/100 against 62/100). The score weights traction, team, visibility and profile completeness, so it reflects company strength rather than which product suits you. We compare the two on 24 data points above: read the rows that match what you are buying for.
How do Mastra and Sierra compare on the numbers?
Mastra leads on our overall score (76/100 against 62/100), agent readiness (58/100 against 50/100). Sierra leads on headcount (277 against 53), funding raised ($1.6B against $35.5M), LinkedIn following (29,888 against 6,591).
Read the full Mastra review and pricing or the Sierra review and pricing. You can also browse other Mastra alternatives we track.