KairosDB

Linux · Self-hosted · API

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Freedom report

One barScore 5.3

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

KairosDB is ranked #20 of 36 in time-series databases on Freedom251. It runs on API, Linux, Self-hosted.

Compared on time-series databases

Deployment: self_hosted
Retention policies: Yes
Horizontal scaling: Yes
Ingestion methods: REST API, Telnet, Graphite plaintext, Graphite pickle, plugins

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The record

Product: KairosDB is a distributed time-series database built on Cassandra.
Data collection: It accepts data through Telnet, REST, Graphite, and plugins.
Storage backends: The documentation describes H2 as the default in-memory datastore and Cassandra as an alternative for persistent storage.
Queries: The REST API can query metric data by metric name and time range, optionally filtering by tags, and supports aggregation and downsampling.
Aggregators: Built-in aggregators include min, max, sum, count, and mean.
Web interface: A default install serves a browser-based query page that the documentation describes as primarily for development.
Import and export: The server provides command-line tools to import and export data.
Extensibility: Guice-based plugins can add data point listeners, datastores, protocol handlers, and system monitors.
Java client: A separate Java client library is available to send metrics and query data points.
Requirements: The installation guide says KairosDB runs with Java 1.8 or later.
Notable limit: The Cassandra row width defaults to about three weeks and cannot be changed after the schema is created without risking data loss.
License: The project repository identifies the license as Apache License 2.0.
Support: The project README directs users to a KairosDB discussion group for questions and community involvement.
Security: The KairosDB pages reviewed do not state security certifications or compliance claims.

Where it ranks on Freedom251

Best Time-Series Databases in 2026#20 of 36

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Sources

kairosdb.github.io· checked 5 Oct 2026
kairosdb.github.io/docs/PushingData.html· checked 5 Oct 2026
kairosdb.github.io/docs/GettingStarted.html· checked 5 Oct 2026
kairosdb.github.io/docs/restapi/Overview.html· checked 5 Oct 2026
kairosdb.github.io/docs/WebUI.html· checked 5 Oct 2026
kairosdb.github.io/docs/ImportExport.html· checked 5 Oct 2026
kairosdb.github.io/docs/kairosdevelopment/Plugins.html· checked 5 Oct 2026
kairosdb.github.io/docs/KairosClient.html· checked 5 Oct 2026
kairosdb.github.io/docs/CassandraSchema.html· checked 5 Oct 2026
github.com/kairosdb/kairosdb· checked 5 Oct 2026