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Top Open Source Time Series Databases Tools in 2026

A curated collection of the 9 best free and open-source Time Series Databases tools in 2026. Compare features, GitHub stars, tech stacks, and self-hosted software.

  • TimescaleDb

    Time-series database built on PostgreSQL

    Stars
    23,425
    Last commit
    11d ago
    License
    Open Source

  • VictoriaMetrics

    Fast, scalable observability database for metrics, logs and traces

    Stars
    17,599
    Last commit
    11d ago
    License
    Apache-2.0

  • TDengine

    Open-source time-series database for industrial data

    Stars
    25,090
    Last commit
    13d ago
    License
    AGPL-3.0

  • QuestDB

    Ultra-fast open-source time-series database

    Stars
    17,281
    Last commit
    11d ago
    License
    Apache-2.0

  • Prometheus

    Open-source monitoring & time series database

    Stars
    65,850
    Last commit
    10d ago
    License
    Apache-2.0

  • Apache IoTDB

    Industrial IoT time-series database for edge-cloud data

    Stars
    6,383
    Last commit
    10d ago
    License
    Apache-2.0

  • GreptimeDB

    Cloud-native observability database unifying metrics, logs, and traces with sub-second queries, 50x cost reduction, and seamless OpenTelemetry integration.

    Stars
    6,576
    Last commit
    10d ago
    License
    Apache-2.0

  • Apache Druid

    High-performance real-time analytics database

    Stars
    14,046
    Last commit
    11d ago
    License
    Apache-2.0

  • InfluxDB

    Open-source time-series database for metrics and events

    Stars
    31,722
    Last commit
    20d ago
    License
    Apache-2.0
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Showing 9 of 9 open-source tools