head to head · open source
Milvus vs UStore
Milvus has 46,166 GitHub stars, 4,257 forks, 1,405 open issues and last shipped today. UStore has 638 stars, 35 forks, 26 open issues and last shipped 5 days ago. Milvus leads on adoption by 7,136% (46,166 vs 638 stars). Milvus is written in Go under Apache-2.0; UStore is written in C++ under Apache-2.0. Milvus has attracted 9% as many forks as stars, UStore 5%. Milvus was the more recently maintained of the two, and both are self-hostable with no licence fee.
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
| Milvus | UStore | |
|---|---|---|
| GitHub stars | ★ 46K | ★ 638 |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Go | C++ |
| Last push | 2026-09-20 | 2026-09-15 |
| Forks | ⑂ 4.3K | ⑂ 35 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Milvus if
- You weight community size — 46K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Go
- You value the larger contributor base for long-term maintenance
pick UStore if
- You want the UStore 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 UStore fits your workflow better
About Milvus
Milvus is a high performance, cloud native vector database written in Go and C++, designed to power AI applications by efficiently storing, indexing, and searching large scale unstructured data such as text, images, and multi modal embeddings. It implements hardware accelerated approximate nearest neighbor (ANN) search using algorithms like HNSW, FAISS, and DiskANN, and supports both real time streaming updates and batch ingestion. Milvus lives in the GenAI infrastructure ecosystem, serving as the persistent storage and retrieval layer for embedding based workloads including RAG, recommendation, and image search.…
read the full Milvus overview →
About UStore
UStore is an Apache 2.0, C++ multi modal database that holds blobs, documents, graphs, and vectors behind one ACID transactional API, aimed at Python, C, C++, GoLang, and Java developers building AI and semantic search systems.
read the full UStore overview →
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Frequently asked questions
Is Milvus or UStore more popular?
Milvus has 46,166 GitHub stars and UStore has 638. Milvus has the larger community by that measure.
Are Milvus and UStore free?
Both are open source. Milvus is licensed under Apache-2.0 and UStore under Apache-2.0. Neither carries a licence fee.
What is the difference between Milvus and UStore?
Milvus is written in Go and UStore 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, Milvus or UStore?
Choose Milvus if you want the larger community (46,166 stars) or its Apache-2.0 licence terms. Choose UStore if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.