Both sit in the framework layer with similar commercial terms, so the practical split is language: Mastra targets TypeScript and LlamaIndex targets Python.
TypeScript agent framework with workflows, memory, evals and a local playground.
Data-first framework — ingestion, indexing and RAG-heavy agents.
| Mastra | LlamaIndex | |
|---|---|---|
| Licence | Open source | Open source |
| Pricing | open source | freemium |
| Self-hostable | Yes | Yes |
| Languages | TypeScript | Python, TypeScript |
| Install | npm install @mastra/core | pip install llama-index |
| Keys required | None | None |
Both sit in the framework layer with similar commercial terms, so the practical split is language: Mastra targets TypeScript and LlamaIndex targets Python. Mastra: TypeScript agent framework with workflows, memory, evals and a local playground. LlamaIndex: Data-first framework — ingestion, indexing and RAG-heavy agents.
Mastra can run on your own infrastructure. LlamaIndex can run on your own infrastructure.
Mastra is open source (open source). LlamaIndex is open source (freemium).
Every page here answers to Accept: text/markdown and returns the same content at roughly a tenth the tokens. No separate site, no toggle — same URL.
curl -s -H "Accept: text/markdown" https://newagent.build/compare/mastra-vs-llamaindex