Circle Labs vs Mastra
Circle Labs vs Mastra, compared side by side on 18 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: Circle Labs is on 49/100 and Mastra on 77/100.
Where each one leads
Circle Labs
Leads on none of the measures we hold for both companies.
Mastra
- our overall score: 77/100 against 49/100
- agent readiness: 58/100 against 21/100
- domain rating: 76/100 against 26/100
- funding raised: $35.5M against $4.2M
At a glance
| Measure | Circle Labs | Mastra |
|---|---|---|
| What it is | Generative AI friends and AI-powered virtual characters (Shapes) for social platforms. | An open-source TypeScript/JavaScript framework for building AI agents, from the creators of Gatsby. |
| Category | Agentic AI, AI Agents, Generative AI, Large Language Model | Agentic AI, AI Agents, Developer Tools, Open Source |
| Sells toBusiness model | B2C | B2B |
| Offering | Platform | Platform |
| Founded | 2020 | 2024 |
| Headquarters | San Francisco, United States | San Francisco, United States |
| Status | Inactive | Active |
Size, funding and growth
| Measure | Circle Labs | Mastra |
|---|---|---|
| Employees | Not published | 53 |
| Headcount growthLast 12 months | Not published | +204.5% |
| Total funding | $4.2M | $35.5M |
| Latest round | Seed | Series A |
| LinkedIn followers | Not published | 6,591 |
StartupHub scores
Our own 0-100 ratings. They measure company strength and site quality, not which product suits you.
| Measure | Circle Labs | Mastra |
|---|---|---|
| StartupHub scoreOur 0-100 rating | 49/100 | 77/100 |
| Traction | 33/100 | 70/100 |
| Team | 70/100 | 90/100 |
| Community | Not published | 38/100 |
| Search visibility | 21/100 | 68/100 |
| Quality | 58/100 | 78/100 |
| Agent readinessHow well an AI agent can read and act on the site | F (21/100) | D (58/100) |
| Domain ratingLink authority, 0-100 | 26/100 | 76/100 |
Technology
Detected on each public site, so it reflects the marketing stack as well as the product.
| Measure | Circle Labs | Mastra |
|---|---|---|
| Hosting | Not detected | Vercel |
| CDN | Not detected | Vercel |
| Frameworks | Not detected | Next.js, Tailwind CSS |
| Open source | No | Yes, 15,100 GitHub stars |
| Self-hostable | No | Yes |
Product and pricing
| Measure | Circle Labs | Mastra |
|---|---|---|
| Key features | Not published | AI Agent Framework, Workflows, RAG, Evals, Memory & Tool Selection, Open Source & Modular |
What users say
| Measure | Circle Labs | Mastra |
|---|---|---|
| Community ratingVisitor votes on StartupHub | Not published | 5.0/5 from 2 votes |
Circle Labs vs Mastra: common questions
Which is better, Circle Labs or Mastra?
On our 0-100 score Mastra rates higher (77/100 against 49/100). 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 18 data points above: read the rows that match what you are buying for.
How do Circle Labs and Mastra compare on the numbers?
Mastra leads on our overall score (77/100 against 49/100), agent readiness (58/100 against 21/100), domain rating (76/100 against 26/100), funding raised ($35.5M against $4.2M).
Read the full Circle Labs review and pricing or the Mastra review and pricing. You can also browse other Circle Labs alternatives we track.