head to head · open source
PageIndex vs zvec
PageIndex has 35,765 GitHub stars, 3,152 forks, 103 open issues and last shipped yesterday. zvec has 15,972 stars, 998 forks, 56 open issues and last shipped today. PageIndex leads on adoption by 124% (35,765 vs 15,972 stars). PageIndex is written in Python under MIT; zvec is written in C++ under Apache-2.0. PageIndex has attracted 9% as many forks as stars, zvec 6%. zvec was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (rag), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| PageIndex | zvec | |
|---|---|---|
| GitHub stars | ★ 36K | ★ 16K |
| License | MIT | Apache-2.0 |
| Written in | Python | C++ |
| Last push | 2026-09-19 | 2026-09-20 |
| Forks | ⑂ 3.2K | ⑂ 998 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick PageIndex if
- You weight community size — 36K stars and counting
- You want the MIT license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick zvec if
- You want the zvec feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches C++
- You evaluated both and zvec fits your workflow better
About PageIndex
PageIndex is a vectorless, reasoning based retrieval augmented generation engine written in Python and released under the MIT license. It lives in the AI and machine learning infrastructure ecosystem, with topics spanning RAG, information retrieval, LLM reasoning, context engineering, and agentic AI. Instead of building a vector index, PageIndex generates a hierarchical tree index for each document and then lets a large language model reason its way through that tree, in the same way a human expert turns to the right section of a long report. The project ships as a Python SDK, a hosted cloud service, and a docume…
read the full PageIndex overview →
About zvec
Zvec is an open source, in process vector database written in C++ and licensed under Apache 2.0, built to embed directly into applications so that vector search, full text search, and hybrid retrieval run inside the developer's own process instead of behind a separate service.
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Frequently asked questions
Is PageIndex or zvec more popular?
PageIndex has 35,765 GitHub stars and zvec has 15,972. PageIndex has the larger community by that measure.
Are PageIndex and zvec free?
Both are open source. PageIndex is licensed under MIT and zvec under Apache-2.0. Neither carries a licence fee.
What is the difference between PageIndex and zvec?
PageIndex is written in Python and zvec in C++. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, PageIndex or zvec?
Choose PageIndex if you want the larger community (35,765 stars) or its MIT licence terms. Choose zvec if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.