Head-to-Head Comparison · Alternative to kdb+ · 🗄️ databases
kdb+ vs QuestDB
QuestDB: high-performance, open-source time-series database. Here is how QuestDB ($0/mo open source) stacks up against kdb+ ($100/mo) across cost, hosting, data privacy, and real-world trade-offs.
QuestDB
$0.00/mo · cm0zfrz5200pu94snwyqzpqx7
kdb+ vs QuestDB Specification Matrix
facts verified 2026-11-04
| Dimension | kdb+ (Paid) | QuestDB (Replacement) |
|---|---|---|
| Monthly Price | $100 / mo | $0 / mo |
| 1-Year Cost (1 seat) | $1,200 / yr | $0 / yr (Save $1,200) |
| 1-Year Cost (5 seats) | $6,000 / yr | $0 / yr (Save $6,000) |
| 1-Year Cost (10 seats) | $12,000 / yr | $0 / yr (Save $12,000) |
| Source & License | Proprietary SaaS | open source cm0zfrz5200pu94snwyqzpqx7 |
| Where It Runs | Vendor Cloud | Self-host (your server) |
| Platforms | Web / Cloud | webself-hosteddocker to self-host |
| GitHub Stars | — | ★ 17.5k (active nov 2026) |
Deep Dive: Switching from kdb+ to QuestDB
Trade-offs, installation & data architecture
What you trade away
Requires self-hosting setup, updates, and server maintenance compared to managed kdb+.
How to deploy QuestDB
Clone https://github.com/questdb/questdb or deploy with Docker Compose
What it takes to run
Deploy via Docker or binary release from GitHub and configure environment variables.
Where your data lives
All application data and configuration live on your own server or local database.
Why fork QuestDB instead of vibe-coding a kdb+ clone?
Instead of paying recurring SaaS fees for kdb+ or rebuilding it from scratch, deploy one of the 4 battle-tested open-source alternatives like InfluxDB or TDengine.
kdb+ vs QuestDB FAQ
Is QuestDB a good free alternative to kdb+?+
Yes. QuestDB is a verified open-source (cm0zfrz5200pu94snwyqzpqx7) replacement for kdb+. QuestDB: high-performance, open-source time-series database.
What is the catch when switching from kdb+ to QuestDB?+
Requires self-hosting setup, updates, and server maintenance compared to managed kdb+.
How much do you save switching from kdb+ to QuestDB?+
kdb+ costs $100/mo ($1,200/yr) per seat, whereas QuestDB is $0/mo. Switching saves $1,200/yr for a solo user, $6,000/yr for a 5-person team, and $12,000/yr for a 10-person team.
How do I install or self-host QuestDB instead of kdb+?+
Install: Clone https://github.com/questdb/questdb or deploy with Docker Compose. Setup: Deploy via Docker or binary release from GitHub and configure environment variables.