Little is known about online behaviours of violent extremists generally or differences compared to non-violent extremists who share ideological beliefs. Even less is known about desistance from posting behaviour. A sample of 99 violent and non-violent right-wing extremists to compare their online patterns of desistance within a sub-forum of the largest white supremacy web-forum was analysed. A probabilistic model of desistance was tested to determine the validity of criteria set for users reaching posting desistance. Findings indicated that the criteria predicted “true” desistance, with 5% misidentification. Each consecutive month without posting in the sub-forum resulted in a 7.6% increase in odds of posting desistance. There were no significant differences in effects for violent versus non-violent users, though statistical power was low.