Due to an unexpected service incident, you may have experienced a delay in the Similarity Report generation, as well as possible errors when attempting to log in to Turnitin, Turnitin UK, Similarity, SimCheck, Originality, Authorship, iThenticate V2, and Crossref Similarity Check today. Users accessing via an integration may have also been affected. We are pleased to advise that service has been restored.
The incident occurred between the following times:
PDT: Tuesday, 31st March 20:00 - Tuesday, 31st March 22:11 BST: Wednesday, 1st April 04:00 - Wednesday, 1st April 06:11 AEDT: Wednesday, 1st April 14:00 - Wednesday, 1st April 16:11
We regret any inconvenience this may have caused if you were impacted by today’s incident.
Posted Mar 31, 2026 - 22:27 PDT
Identified
We’ve run into some issues.
Turnitin, Turnitin UK, Similarity, SimCheck, Originality, Authorship, iThenticate V2, and Crossref Similarity Check are currently experiencing an unexpected service incident.
During this time, you may experience a delay in the Similarity Report generation, as well as possible errors when attempting to log in to Turnitin Similarity, SimCheck, Originality, Authorship, iThenticate V2, and Crossref Similarity Check. Users accessing via an integration may have also been affected.
We invite you to track the progress of this incident while we work to bring the service back to optimum health.