head to head · open source
Qdrant vs QuestDB
Qdrant has 35,390 GitHub stars, 2,793 forks, 704 open issues and last shipped yesterday. QuestDB has 17,496 stars, 1,685 forks, 952 open issues and last shipped yesterday. Qdrant leads on adoption by 102% (35,390 vs 17,496 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%. QuestDB 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 | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 2.8K | ⑂ 1.7K |
| 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
Vector Search Engine for the next generation of AI applications Qdrant (read: quadrant ) is a vector similarity search engine and vector database. It provides a production ready service with a convenient API to store, search, and manage points—vectors with an additional payload. Qdrant is tailored for extended filtering support, making it useful for all sorts of neural network or semantic based matching, faceted search, and other applications. Qdrant is written in Rust 🦀, which makes it fast and reliable even under high load. See benchmarks. With Qdrant, embeddings or neural network encoders can be turned into…
read the full Qdrant overview →
About QuestDB
English 简体中文 QuestDB is the open source, low latency time series database on open formats. It ingests millions of events per second, computes on live data in milliseconds, and keeps years of history queryable. One SQL engine spans ingestion, stream processing, and tiered storage. The engine is zero GC Java with C++ and Rust on the hot paths. Data lives in memory mapped, time partitioned columns. Queries run across all cores with SIMD and JIT compiled filters. There are no third party dependencies on the data path. Storage is tiered: a parallel write ahead log, native columnar partitions, and Apache Parquet. In…
read the full QuestDB overview →
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Frequently asked questions
Is Qdrant or QuestDB more popular?
Qdrant has 35,390 GitHub stars and QuestDB has 17,496. 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 (35,390 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.