Versus Engine
LlamaIndex vs Mastra
Specs, price and the one trade-off that actually decides it — LlamaIndex against Mastra, side by side.
Cheaper to start
LlamaIndex
Has a free tier.
Best ecosystem
Tie
Neither lists native integrations.
Standout
LlamaIndex
Best for RAG
LlamaIndex
Data framework for LLM applications.
Where it wins, where it doesn't
Pros
- Best for RAG
- Easy data connectors
- 4x cheaper than Frontier Labs
- 5x more accurate than other APIs
- 25M+ package downloads a month
- 1B+ documents processed
- 300k+ LlamaParse users
Cons
- Less agentic focus than others
Mastra
Opinionated, strongly-typed agent framework for Next.js and TypeScript.
Where it wins, where it doesn't
Pros
- Native TypeScript with genuinely useful type safety
- Integrates cleanly with Next.js
- Telemetry built in rather than bolted on
Cons
- Young ecosystem — few answers exist for unusual problems
- API surface has shifted between minor versions
- Opinionated structure fights you if your architecture differs