Open source alternatives to Datadog

Why people switch: Per-host and per-GB billing turns observability into one of the largest infra line items.

• SigNoz

  OpenTelemetry-native APM; one tool for all three signals.

  MIT/Apache-2.0self-hostable
• OpenObserve

  Very low storage cost at high ingest volume.

  AGPL-3.0self-hostableIn the Open Family
• OpenTelemetry

  Instrument once with the vendor-neutral standard, then choose a backend.

  Apache-2.0self-hostableIn the Open Family