whichdb
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QuestDB vs SiriDB

QuestDB: Columnar time-series SQL database built for market data and very high ingest rates. SiriDB: Small-footprint, clusterable time-series database with a query language built for grouping series.

key differences

  • Horizontal scaling is none in QuestDB and native in SiriDB.
  • Transactions: QuestDB offers limited ACID; SiriDB offers none.
  • Only QuestDB has joins, secondary indexes, materialized views, columnar storage, role-based access.

choose questdb for

  • +Market data and order book analytics
  • +Trading and risk dashboards
  • +Industrial and aerospace telemetry
  • +Crypto exchange tick storage

best at · Time-series, Tick data, Real-time analytics

choose siridb for

  • +Self-hosted infrastructure monitoring backends
  • +Embedded or resource-constrained metrics storage
  • +Grafana dashboards over many similar series

best at · Time-series, Observability, IoT

QuestDBColumnar time-series SQL database built for market data and very high ingest rates.
SiriDBSmall-footprint, clusterable time-series database with a query language built for grouping series.
overview
Primary model
Time-Series
Time-Series
Also supports
Columnar / OLAP, Relational
–
Type
Database engine
Database engine
Status
Active
Active
Developer
QuestDB
Cesbit
First release
2019
2016
Latest version
10.1.0 (Oct 22, 2026)
2.0.56 (Aug 25, 2026)
License
Open source (permissive)Apache License 2.0 (open source); Enterprise is commercial
Open source (permissive)MIT License
Free tier
✓
✓
popularity
WhichDB Score
34.1
4.0
Rank
#60
#422
GitHub stars
17.5K
515
Stack Overflow questions
282
–
scale & guarantees
Comfortable data size
Medium (≤ 10 TB)
Medium (≤ 10 TB)
Horizontal scaling
None
Native
Multi-region
Read replicas
None
ACID
Limited
None
Consistency
Strong
Eventual
Schema
Flexible
Schemaless
Architecture
Single node, Primary replica, Client server
Distributed, Client server
deployment
Self-hosted
✓
✓
Vendor-managed cloud
✓
—
Serverless
—
—
Embedded
—
—
Edge
—
—
Clouds
–
–
capabilities
Transactions
—
—
Joins
✓
—
Secondary indexes
✓
—
Full-text search
—
—
Vector search
—
—
Geospatial
—
—
JSON
—
—
Change data capture
—
—
Triggers
—
—
Stored procedures
—
—
Materialized views
✓
—
TTL / expiry
✓
✓
Pub/Sub
—
—
Columnar storage
✓
—
In-memory
—
—
Durable persistence
✓
✓
Compression
✓
✓
Encryption at rest
—
—
Role-based access
✓
—
Time travel
—
—
Branching
—
—
Online schema changes
✓
—
Streaming ingest
✓
—
Offline sync
—
—
Runs in WebAssembly
—
—
interfaces
Query languages
SQL
SiriDB query language
Client languages
Java, Python, Go, Rust, C, C++, C#, JavaScript
Python, Go, JavaScript, C
Best for
Time-series, Tick data, Real-time analytics, IoT
Time-series, Observability, IoT
Add more to this comparisonNot sure either fits? Try smart match

QuestDB vs SiriDB: FAQ

What is the difference between QuestDB and SiriDB?

QuestDB: Columnar time-series SQL database built for market data and very high ingest rates. SiriDB: Small-footprint, clusterable time-series database with a query language built for grouping series. Horizontal scaling is none in QuestDB and native in SiriDB. Transactions: QuestDB offers limited ACID; SiriDB offers none. Only QuestDB has joins, secondary indexes, materialized views, columnar storage, role-based access.

When should I choose QuestDB over SiriDB?

Choose QuestDB for market data and order book analytics; trading and risk dashboards; and industrial and aerospace telemetry. Choose SiriDB for self-hosted infrastructure monitoring backends, embedded or resource-constrained metrics storage and grafana dashboards over many similar series.

Is QuestDB or SiriDB more popular?

QuestDB ranks #60 on the WhichDB Score (34.1/100) and SiriDB ranks #422 (4.0/100). Popularity is not fit: check the requirements that matter for your project.

Are QuestDB and SiriDB open source?

Yes. QuestDB is open source. License: Apache License 2.0 (open source); Enterprise is commercial. Yes. SiriDB is open source. License: MIT License.