What are good alternatives to Justuno for on-site messaging?

Topic summary

Seeking recommendations for an on-site messaging app that can target users by behavior (e.g., purchasers, returning non-purchasers, new visitors). The requester already uses Attentive for lead capture and wants a tool focused solely on displaying on-site messages, similar to Justuno, but is looking for alternatives. No specific apps or solutions have been proposed yet. No decisions or actions taken. Discussion remains open with key question: which non-Justuno apps support behavior-triggered on-site messaging without overlapping lead-capture features.

Summarized with AI on January 1. AI used: gpt-5.

Hi,

Looking for recommendations for an app for on-site messaging that can be triggered by past behavior (e.g. purchasers, non-purchasers returning visitor, new visitor, etc.). We already use Attentive for lead-capture so looking for an app just to display on-site messaging. Something similar to Justuno. Besides Justuno, any other recommendations?

Thank you.