OptinMonster
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OptinMonster specializes in getting visitors to say yes. Exit-intent detection shows an offer right as someone's about to leave, while gamified opt-ins like spin-to-win contests increase engagement significantly over plain forms. The builder handles popups, lightboxes, inline forms, and notification bars.
Targeting rules let you show different popups based on where visitors came from, what device they use, or their behavior on your site. It works across any website via simple JavaScript snippet, not locked into one platform, and includes analytics to test and refine your opt-in strategy.