MastraTypeScript AI Framework for Agents and Apps
vs
SierraHelps businesses build better, more human customer experiences with AI.
Comparison · AI Agents · weekly run Nov 3
Mastra vs Sierra
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
Sierra is the stronger AI pick in AI Agents: it has a visibility score of 1.5 versus 1.2 for Mastra.
Choose Mastra if…
- AI answers describe it more positively (100% vs 33% positive)
- Type-safe, production-grade application code
- Suited to serious production systems
Choose Sierra if…
- You want the brand AI engines rank higher (1.5 vs 1.2)
- You prefer a larger, established vendor (1,001–5,000 employees)
AI visibility side by side
Latest weekly run · Nov 3
| Metric | Mastra | Sierra |
|---|---|---|
| Visibility score | 1.2% | 1.5% |
| Change vs last week | New | New |
| Rank in AI Agents | #56 | #49 |
| Share of voice | 0.5% | 0.5% |
| Mentions this run | 3 | 3 |
| Positive in AI answers | 100% | 33% |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
Mastra 0pp · Sierra 0pp over 0 weekly runs.
Engine by engine
Sierra leads on 2 of 3 engines
ChatGPT
AI Mode
Perplexity
MastraSierra
Head to head in AI answers
0 engine answers name both brands
0Mastra ranked higher
0Sierra ranked higher
Features, pricing & fit
| Dimension | Mastra | Sierra |
|---|---|---|
| Pricing model | Flat tiers | — |
| Entry price | Free; paid from $250 / mo | — |
| Free plan | Yes | — |
| Deployment | Self-hosted on any Node.js-compatible environment, or hosted on Mastra Cloud and Mastra Platform. | Managed and forward-deployed, with no self-serve option. |
| Support | Shared Slack support channel (Enterprise), Dedicated support engineer (Enterprise), SLA support 8-5 Monday-Friday, 8am-6pm PST | — |
| Founded | 2024 | 2024 |
| Headquarters | San Francisco | San Francisco, California, United States |
| Employees | 11–50 | 1,001–5,000 |
| Funding | Series A · $35M raised | Series E, led by Tiger Global and GV |
| Best for | Developers and teams building AI agents in TypeScript and JavaScript | Businesses that want customer service AI agents across chat and voice, built by customer experience teams with or without engineering support. |
Plans side by side
Sierra
Pricing not available.
Pros and cons
Themes from the AI answers that mention each brand
Mastra
- Type-safe, production-grade application code
- Suited to serious production systems
Sierra
Profile in progress.
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “Mastra vs Sierra”, https://slateindex.ai/compare/mastra-vs-sierra, data of Nov 3, 2026. Licence: CC BY 4.0.