QuestDB vs TDengine
No clear leader: TDengine (54.5) and QuestDB (49.9) are within the 5-point margin; treat as a tie. The attribute-by-attribute breakdown below, with a source and date on every value, is the honest way to compare them.
Capabilities
Feature-by-feature on the axes that matter for time-series databases. “-” means undocumented, not absent.
What each one is
The product in its own terms, so the numbers below have context.
QuestDB
A specialized database engineered to ingest high-volume time-series data at speed, execute queries with minimal latency, and maintain queryable history across tiered storage layers—combining standard SQL with open file formats for portability.
TDengine
Open-source time-series database for real-time processing of high-volume sensor data, supporting distributed deployment and AI-powered analytics.
Pricing
List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.
QuestDB
Open-source Apache 2.0 free tier; QuestDB Cloud and Enterprise plans available via contact/quote
TDengine
Free tier up to 5,000 tags. Self-hosted annual licenses from $12,500/year, perpetual from $31,250. Managed cloud from $970/month. High availability at +30% of plan cost.
- Free TierFree
- All TSDB and IDMP features
- Official support available separately
- Self-Hosted Annual LicenseFrom $12,500/year (7,500 tags). Pricing scales with deployment size.
- Standard support included
- Product updates and patches
- Self-Hosted Perpetual LicenseFrom $31,250 (7,500 tags). One-time cost, pricing scales with deployment size.
- Perpetual usage rights
- Optional annual support available
- Cloud - Starter$970/month or $11,640/year
- Fully managed on AWS, Azure, or GCP
- Managed infrastructure and operations
- Cloud - Small$1,740/month or $20,880/year
- Cloud - Medium$2,570/month or $30,840/year
- Cloud - Large$3,500/month or $42,000/year
- Cloud - XLarge$5,220/month or $62,640/year
Platform & deployment
Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.
Integrations
What each product connects to. Counts come from the vendor's own integration directory where one exists.
- Kafka
QuestDB
- PostgreSQL
- Parquet
- Arrow
- Polars
- Pandas
- Debezium
- Iceberg
- MySQL
- MongoDB
- Cassandra
- Apache Parquet
- Apache Arrow
- Claude Code
- REST API
- Apache Iceberg
- Databricks
- AWS
- Azure
TDengine
- Java
- Python
- Go
- MQTT
- OPC
- PI System
- Excel
- Apache Pulsar
- AVEVA Historian
QuestDB or TDengine: which one depends on you
A composite score cannot know your constraints. Describe them and both get re-weighted against what you actually need, with the evidence behind every position.
Free to run, no account needed to start. How the evaluation works
Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.