2 open-source Time Tracking vendors.

Open-source software for Time Tracking that you can self-host, with auditable source code — regardless of the developer's headquarters.

• CattrSelf-hosted / open source

  Ukrainian open-source time tracker with activity detection and screenshots, multi-platform.

  Ukraine

• solidtimeSelf-hosted / open source

  solidtime is an open-source (AGPL-3.0) time tracking application built by a two-person Austrian partnership (GesbR) based in Vienna, Austria (Türkenstraße 19/1b, 1090 Wien). It is bootstrapped, has 8,600+ GitHub stars and 15,000+ users, and remains actively developed with updates as recent as June 2026. It markets itself as privacy-first and GDPR-friendly, offering both a self-hosted option and an EU-hosted managed service — no dependency on non-EU cloud infrastructure was found in verification.

  Austria