USDL 4.0 2025 | Institutions

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USDL 4.0 2025 runs on Tabbycat 2.9.3-c (Ragdoll - Calico)

Tabbycat is an open-source project developed by volunteers and is free to use. For a tournament of this size, we suggest a donation of $4. Learn more about donating.

Still timing debates with the stopwatch app?

Using an app designed for debate timekeeping makes speaking and adjudicating easier! Check out Timekept (iPhone/iPad) or Debatekeeper (Android).

Our Organisation

Tabbycat is supported by the Tabbycat Debate Association, a non-profit for advancing open debate technology.

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