Side by side
IBM Db2 vs QuestDB
Both stand on analytics data. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan APILinuxSelf-hosted+2
Choose IBM Db2 if you need a database for varied enterprise workloads, with query optimization, vector queries, and options for availability and security. Consider the free tier only for small needs: it includes 200 MB of storage and five connections, while Performance starts at $630 a month.
Visit IBM Db2
Free plan APILinuxMac+3
Visit QuestDB The facts
| IBM Db2 | QuestDB | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | API, Linux, Self-hosted, Web, Windows | API, Linux, Mac, Self-hosted, Web, Windows |
| Lowest paid plan | Db2 Database SaaS Performance: $630 a month | Free or on request |
| Plans published | 7 | 2 |
| Maker | Not published | QuestDB |
| Website | ibm.com | questdb.com |
| On analytics data | #9 of 30 | #14 of 30 |
IBM Db2: what it does well
- Runs transactional, analytical, and operational workloads against one database.
- AI optimization adapts execution plans using historical query patterns.
- Vector data type and SQL distance queries support semantic search and RAG.
- Security features include encryption, access controls, monitoring, and data masking.
- Integrates with analytics, reporting, and data tools through drivers and integrations.
What to know first
- The free tier is limited to 200 MB of storage and five connections.
- Performance starts at $630 a month, billed hourly.
- AI Community is capped at four CPU cores and 16 GB memory.
QuestDB: what it does well
Alternatives to IBM Db2 Alternatives to QuestDB The whole list