head to head · open source
Qdrant vs QuestDB
Qdrant has 34,638 GitHub stars, 2,680 forks, 704 open issues and last shipped yesterday. QuestDB has 17,326 stars, 1,647 forks, 952 open issues and last shipped yesterday. Qdrant leads on adoption by 100% (34,638 vs 17,326 stars). Qdrant is written in Rust under Apache-2.0; QuestDB is written in Java under Apache-2.0. Qdrant has attracted 8% as many forks as stars, QuestDB 10%. Qdrant 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
| Qdrant | QuestDB | |
|---|---|---|
| GitHub stars | ★ 35K | ★ 17K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Rust | Java |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 2.7K | ⑂ 1.6K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Qdrant if
- You weight community size — 35K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Rust
- You value the larger contributor base for long-term maintenance
pick QuestDB if
- You want the QuestDB feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Java
- You evaluated both and QuestDB fits your workflow better
About Qdrant
Qdrant is a vector similarity search engine and database built in Rust, designed for production use in AI applications. It stores, manages, and retrieves high dimensional vectors alongside associated metadata (payloads), supporting fast nearest neighbor search with filtering. It solves the problem of efficiently performing semantic or neural based matching at scale—such as finding similar images, recommending content, or powering retrieval augmented generation (RAG)—by replacing slow or inflexible brute force or index based approaches with a purpose built engine optimized for vector operations.…
read the full Qdrant overview →
About QuestDB
QuestDB open source time series database. Java, Apache 2.0, category Infrastructure & Operations / Databases. Lives in open source database ecosystem for massive data scale, low latency, real time analytics.
read the full QuestDB overview →
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Frequently asked questions
Is Qdrant or QuestDB more popular?
Qdrant has 34,638 GitHub stars and QuestDB has 17,326. Qdrant has the larger community by that measure.
Are Qdrant and QuestDB free?
Both are open source. Qdrant is licensed under Apache-2.0 and QuestDB under Apache-2.0. Neither carries a licence fee.
What is the difference between Qdrant and QuestDB?
Qdrant is written in Rust and QuestDB in Java. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Qdrant or QuestDB?
Choose Qdrant if you want the larger community (34,638 stars) or its Apache-2.0 licence terms. Choose QuestDB if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.