Mastra vs Phases
Mastra vs Phases, 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: Mastra is on 77/100 and Phases on 29/100.
Where each one leads
Mastra
- our overall score: 77/100 against 29/100
- domain rating: 76/100 against 22/100
- headcount: 53 against 3
Phases
- agent readiness: 68/100 against 58/100
At a glance
| Measure | Mastra | Phases |
|---|---|---|
| What it is | An open-source TypeScript/JavaScript framework for building AI agents, from the creators of Gatsby. | Phases is building the first full-stack AI agent company to automate clinical trials for pharma companies, starting with patient recruitment. |
| Category | Agentic AI, AI Agents, Developer Tools, Open Source | Agentic AI |
| Sells toBusiness model | B2B | B2B |
| Offering | Platform | Not published |
| Founded | 2024 | 2025 |
| Headquarters | San Francisco, United States | Not published |
| Status | Active | Active |
Size, funding and growth
| Measure | Mastra | Phases |
|---|---|---|
| Employees | 53 | 3 |
| Headcount growthLast 12 months | +204.5% | Not published |
| Total funding | $35.5M | Not published |
| Latest round | Series A | Not published |
| LinkedIn followers | 6,591 | Not published |
StartupHub scores
Our own 0-100 ratings. They measure company strength and site quality, not which product suits you.
| Measure | Mastra | Phases |
|---|---|---|
| StartupHub scoreOur 0-100 rating | 77/100 | 29/100 |
| Traction | 70/100 | 6/100 |
| Team | 90/100 | 70/100 |
| Community | 38/100 | Not published |
| Search visibility | 68/100 | 15/100 |
| Quality | 78/100 | Not published |
| Agent readinessHow well an AI agent can read and act on the site | D (58/100) | C (68/100) |
| Domain ratingLink authority, 0-100 | 76/100 | 22/100 |
Technology
Detected on each public site, so it reflects the marketing stack as well as the product.
| Measure | Mastra | Phases |
|---|---|---|
| Hosting | Vercel | AWS |
| CDN | Vercel | CloudFront |
| Frameworks | Next.js, Tailwind CSS | Tailwind CSS |
| Open source | Yes, 15,100 GitHub stars | No |
| Self-hostable | Yes | No |
Product and pricing
| Measure | Mastra | Phases |
|---|---|---|
| Key features | AI Agent Framework, Workflows, RAG, Evals, Memory & Tool Selection, Open Source & Modular | AI-Powered Patient Recruitment, Automated Medical Record Review, Efficient Screening Conversations, 24/7 Patient Engagement & Scalability, Seamless Integration, Cost Reduction & Trial Acceleration |
What users say
| Measure | Mastra | Phases |
|---|---|---|
| Community ratingVisitor votes on StartupHub | 5.0/5 from 2 votes | Not published |
Mastra vs Phases: common questions
Which is better, Mastra or Phases?
On our 0-100 score Mastra rates higher (77/100 against 29/100). 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 Mastra and Phases compare on the numbers?
Mastra leads on our overall score (77/100 against 29/100), domain rating (76/100 against 22/100), headcount (53 against 3). Phases leads on agent readiness (68/100 against 58/100).
Read the full Mastra review and pricing or the Phases review and pricing. You can also browse other Mastra alternatives we track.