OptinMonster

OptinMonster's exit-intent detection catches visitors about to leave, triggering targeted popups at the right moment. A/B testing is built in, letting you compare variations and identify what converts best. Behavior-based targeting uses device type, referrer, and user actions to show the right message to the right person.

The editor features pre-built templates and a visual builder for customization. It connects with major email platforms and CRMs, so new subscribers sync automatically to your lists.