Comparison

QuestDB vs TDengine

On the evidence we track, TDengine leads this comparison with a composite score of 56/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

QuestDB full profile →TDengine full profile →

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QuestDB50

★TDengine56

Attribute comparison across 2 tools
Attribute	QuestDB	TDengineLeader
Vioscale score	50 / 100medium · 65%updating	56 / 100medium · 69%updating
Pricing
Free tierpricing.free_tier	✓	✓
Modelpricing.model	commercial	freemium
Price levelpricing.price_level	low	low
Transparentpricing.transparent	✗	✓
Integrations
Countintegrations.count	10	3
Security
Gdprsecurity.gdpr	✓	-
Iso27001security.iso27001	-	✓
Scorecardsecurity.scorecard	4.3	4
Soc2security.soc2	✓	✓
Vulnerabilitiessecurity.vulnerabilities	Count: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=maven&package_name=org.questdb%3Aquestdb&per_page=100 · Last 12m: 0	Count: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=%40tdengine%2Fclient&per_page=100 · Last 12m: 0
Reliability
Sla pctreliability.sla_pct	99.9	-
Status pagereliability.status_page	-	✓
Adoption
Dependent reposadoption.dependent_repos	106	7
Github starsadoption.github_stars	17,279	25,090
Activity
Commits last 30dactivity.commits_last_30d	64	100
Release
Cadence daysrelease.cadence_days	16	28
Historyrelease.history	20 items	20 items
License
Spdxlicense.spdx	Apache-2.0	AGPL-3.0
Language
Primarylanguage.primary	Java	C
Market
Availabilitymarket.availability	Available worldwide · Popular in GB, US · HQ GB	-

Score

Vioscale score

QuestDB50 / 100medium · 65%updating

TDengine56 / 100medium · 69%updating

Pricing

Free tier

QuestDB✓

TDengine✓

Model

QuestDBcommercial

TDenginefreemium

Price level

QuestDBlow

TDenginelow

Transparent

QuestDB✗

TDengine✓

Integrations

Count

QuestDB10

TDengine3

Security

Gdpr

QuestDB✓

TDengine–

Iso27001

QuestDB–

TDengine✓

Scorecard

QuestDB4.3

TDengine4

Soc2

QuestDB✓

TDengine✓

Vulnerabilities

QuestDBCount: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=maven&package_name=org.questdb%3Aquestdb&per_page=100 · Last 12m: 0

TDengineCount: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=%40tdengine%2Fclient&per_page=100 · Last 12m: 0

Reliability

Sla pct

QuestDB99.9

TDengine–

Status page

QuestDB–

TDengine✓

Adoption

Dependent repos

QuestDB106

TDengine7

Github stars

QuestDB17,279

TDengine25,090

Activity

Commits last 30d

QuestDB64

TDengine100

Release

Cadence days

QuestDB16

TDengine28

History

QuestDB20 items

TDengine20 items

License

Spdx

QuestDBApache-2.0

TDengineAGPL-3.0

Language

Primary

QuestDBJava

TDengineC

Market

Availability

QuestDBAvailable worldwide · Popular in GB, US · HQ GB

TDengine–

Capabilities

Feature-by-feature on the axes that matter for time-series databases. “-” means undocumented, not absent.

Capability comparison for Time-Series Databases
Capability	QuestDB	TDengine
Query
Query language (SQL / PromQL / InfluxQL-Flux / Graphite)	SQL with time-series extensions (SAMPLE BY, ASOF, HORIZON JOIN, N-dimensional ar	-
SQL compatibility	Full SQL	-
Ingest
Ingest model	Push	Push
Model
Data model	Wide events	Metrics (labels/tags)
Lifecycle
Downsampling / rollups	Continuous aggregates	Continuous aggregates
Retention / TTL	-	-
Storage
Compression (columnar / delta / Gorilla)	columnar with frame compression	-
Performance
High-cardinality handling	Strong	Strong
Scale
Clustering / horizontal scale	Distributed / sharded	Distributed / sharded
Replication / HA	✓	✓
Deployment
Deployment	Self-hosted	Self-hosted
Interop
Prometheus remote-write compatible	-	-
Licensing
Licence class	Permissive OSS	Source-available

Query

Query language (SQL / PromQL / InfluxQL-Flux / Graphite)

QuestDBSQL with time-series extensions (SAMPLE BY, ASOF, HORIZON JOIN, N-dimensional ar

TDengine-

SQL compatibility

QuestDBFull SQL

TDengine-

Ingest

Ingest model

QuestDBPush

TDenginePush

Model

Data model

QuestDBWide events

TDengineMetrics (labels/tags)

Lifecycle

Downsampling / rollups

QuestDBContinuous aggregates

TDengineContinuous aggregates

Retention / TTL

QuestDB-

TDengine-

Storage

Compression (columnar / delta / Gorilla)

QuestDBcolumnar with frame compression

TDengine-

Performance

High-cardinality handling

QuestDBStrong

TDengineStrong

Scale

Clustering / horizontal scale

QuestDBDistributed / sharded

TDengineDistributed / sharded

Replication / HA

QuestDB✓

TDengine✓

Deployment

QuestDBSelf-hosted

TDengineSelf-hosted

Interop

Prometheus remote-write compatible

QuestDB-

TDengine-

Licensing

Licence class

QuestDBPermissive OSS

TDengineSource-available

What each one is

The product in its own terms, so the numbers below have context.

QuestDB

QuestDB is an open-source time-series database engineered for low latency, delivering ultra-low latency ingestion, high throughput, and multi-tier storage for demanding time-series workloads.

Independently observed

TDengine

Leader

AI-native industrial data platform and high-performance time-series database that unifies data ingestion, storage, analytics, modeling, visualization, and AI applications.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

QuestDB

HybridFree tier

Open-source Apache 2.0 free tier; QuestDB Cloud and Enterprise plans available via contact/quote

as of 2026-08-14verify ↗

TDengine

Leader

HybridFree tier

Free for up to 5,000 tags. Annual licenses from $12,500/year, perpetual from $31,250 (both scale with tag count). Optional support from $3,375/year. High Availability at +30%.

Free TierFree
- Up to 5,000 tags
- Product usage rights
Annual LicenseFrom $12,500/year for 7,500 tags. Standard Support included.
- Pricing scales from 7,500 to 500,000+ tags
- Standard Support
- Software updates
- Security patches
Perpetual LicenseFrom $31,250 for 7,500 tags. One-time payment.
- Perpetual usage rights

as of 2026-08-01verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platform and deployment support comparison
Supports	QuestDB	TDengine
WebPlatforms	✓	✗
macOSPlatforms	✗	✓
LinuxPlatforms	✗	✓
CLIPlatforms	✓	✓
Cloud / SaaSDeployment	✓	✓
Self-hostedDeployment	✓	✓
HybridDeployment	✗	✓

Platforms

Web

QuestDB✓

TDengine✗

macOS

QuestDB✗

TDengine✓

Linux

QuestDB✗

TDengine✓

CLI

QuestDB✓

TDengine✓

Deployment

Cloud / SaaS

QuestDB✓

TDengine✓

Self-hosted

QuestDB✓

TDengine✓

Hybrid

QuestDB✗

TDengine✓

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

QuestDB

10 total

PostgreSQL
Parquet
Arrow
Polars
Pandas
Debezium
Iceberg
MySQL
MongoDB
Cassandra

Independently observed

TDengine

Leader

3 total

Java
Python
Go

Independently observed

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.