OptinMonster

OptinMonster captures email addresses from traffic a site already has, and its exit-intent trigger is the feature it built its name on: the offer appears as the pointer leaves for the tab bar. Campaigns can be aimed at a page, a referrer, a device or a returning visitor. It is a licence attached to a site rather than a platform holding the list, so the addresses go to whatever email tool is already in use. The pricing is annual and the first year is discounted, which is worth reading before budgeting.

Four annual tiers, each discounted for the first year and renewing at full price, which the page states in a footnote. The standing prices are $210, $570, $870 and $1,470 a year, starting at $7, $19, $29 and $49 a month in year one. A 14-day money-back guarantee applies rather than a trial.

A site with traffic that is not converting into email addresses, where the win comes from targeting rules rather than from a prettier form. Exit intent is worth most on content pages people leave without acting. Anybody who needs the tool to also send the emails is buying half a stack, since this deliberately hands the addresses onward.