For most WordPress sites, OptinMonster is often the best pop up plugin. It is strong for lead capture and sales. It offers advanced targeting rules, templates, and exit-intent popups. It also supports mobile triggers and A/B testing features. If you want a free, flexible option, Popup Maker is a solid choice. It supports exit intent triggers and WooCommerce targeting. For WordPress-only marketing suites, Thrive Leads is also popular for opt-in forms and popups.
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