WikiTrust was a software product, available as a Firefox Plugin, which aimed to assist editors in detecting vandalism and dubious edits by highlighting the "untrustworthy" text with a yellow or orange background.

When the UCSC server was active, WikiTrust assessed the credibility of content and author reputation of wiki articles using an automated algorithm.

WikiTrust on Wikipedia was undertaken by the Online Collaboration Lab at the University of California, Santa Cruz, in response to a Meta-wiki quality initiative sponsored by the Wikimedia Foundation.

[7] WikiTrust is designed for English and German use via the Wiki-Watch pagedetails for Wikipedia articles,[8] in several languages via a Firefox plugin or it can be installed in any MediaWiki configuration.

Generally, users whose content persists for a long time without being "reverted" by other editors are deemed more trustworthy by the software.