PlugRush is an adult-traffic ad network with strength in popunder, native, and push-notification formats. Active for several years, with self-serve advertising and publisher monetization tooling. Less well-known than ExoClick or TrafficJunky but a credible alternative for operators wanting inventory diversification.
Format strengths. Popunder remains PlugRush's highest-volume format; push-notification ads (where the user has opted in to receive notifications and the network delivers ads through that channel) are a meaningful second category. For advertisers, push notifications convert well on users who actually opted in and badly on users who clicked through accidentally — the variance is wider than banner CPM ranges.
Who it fits. Advertisers wanting to test popunder and push-notification campaigns at lower stakes than the major networks impose; publishers running mixed inventory who want a secondary monetization layer; operators diversifying away from ExoClick for risk management.
Who it does not fit. Operators wanting the largest inventory scale (the major networks have more); operators avoiding popunder and push-notification formats for user-experience reasons (PlugRush's strength is in formats premium sites usually avoid).
Bottom line. Credible secondary network for popunder-and-push specifically. See adult banner advertising overview for the broader comparison.