MastraTypeScript AI Framework for Agents and Apps
vs
SimThe open-source AI workspace to build, distribute, and govern AI agents
Comparison · AI Agents · weekly run Nov 3
Mastra vs Sim
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
Sim is the stronger AI pick in AI Agents: it has a visibility score of 2.3 versus 1.2 for Mastra, and ranks ahead in 0% of the answers that name both.
Choose Mastra if…
- Flat tiers pricing suits your budget better than per seat
- Type-safe, production-grade application code
- Suited to serious production systems
Choose Sim if…
- You want the brand AI engines rank higher (2.3 vs 1.2)
- You want a lower entry price ($25 vs $250)
- You need a self-hosted or on-premises option
- You need SOC 2 Type II or ISO 27001 or GDPR coverage
AI visibility side by side
Latest weekly run · Nov 3
| Metric | Mastra | Sim |
|---|---|---|
| Visibility score | 1.2% | 2.3% |
| Change vs last week | New | New |
| Rank in AI Agents | #56 | #39 |
| Share of voice | 0.5% | 0.7% |
| Mentions this run | 3 | 5 |
| Positive in AI answers | 100% | — |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
Mastra 0pp · Sim 0pp over 0 weekly runs.
Engine by engine
Sim leads on 2 of 3 engines
ChatGPT
AI Mode
Perplexity
MastraSim
Head to head in AI answers
1 engine answers name both brands
1Mastra ranked higher
0Sim ranked higher
| Prompt | Engine | Mastra | Sim |
|---|---|---|---|
| Compare the leading AI Agents platforms | Perplexity | #22 | #23 |
Features, pricing & fit
| Dimension | Mastra | Sim |
|---|---|---|
| Pricing model | Flat tiers | Per seat |
| Entry price | Free; paid from $250 / mo | Free; paid from $25 per seat / mo |
| Free plan | Yes | Yes |
| Deployment | Self-hosted on any Node.js-compatible environment, or hosted on Mastra Cloud and Mastra Platform. | Cloud-hosted, or self-hosted in your own cloud with Docker or Kubernetes |
| Integrations | — | 275+ |
| Compliance | — | SOC 2 Type II, ISO 27001, GDPR |
| Support | Shared Slack support channel (Enterprise), Dedicated support engineer (Enterprise), SLA support 8-5 Monday-Friday, 8am-6pm PST | Dedicated support on the Enterprise plan |
| Founded | 2024 | 2025 |
| Headquarters | San Francisco | San Francisco, CA, United States |
| Employees | 11–50 | 11–50 |
| Funding | Series A · $35M raised | Series A · $7M raised |
| Best for | Developers and teams building AI agents in TypeScript and JavaScript | Companies that need to build, deploy, and govern AI agents across the organization with central control over access, spend, and data |
Plans side by side
Sim
Free$0free forever
Pro$25per user/month, billed monthly
Max$100per user/month, billed monthly
EnterpriseCustomcustom, talk to sales
Pros and cons
Themes from the AI answers that mention each brand
Mastra
- Type-safe, production-grade application code
- Suited to serious production systems
Sim
- Technical control and model flexibility
- Self-hosting option
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “Mastra vs Sim”, https://slateindex.ai/compare/mastra-vs-sim, data of Nov 3, 2026. Licence: CC BY 4.0.