Lead Capture & Popup Tools provide overlay widgets — popups, slide-ins, sticky bars, and exit-intent triggers — that capture email subscribers and lead form submissions on existing web pages, distinct from full landing-page builders. The category serves marketers who need lightweight conversion-tactic widgets without rebuilding entire pages. Core capabilities include popup and overlay design with templates, behavioral triggers (time on page, scroll depth, exit intent), audience segmentation rules, A/B testing of popup variants, and email-marketing integrations. The market is led by OptinMonster (dominant SMB) with Sumo, Privy (Shopify/eCom), Wisepops, Mailmunch, Hello Bar, Poptin, GetSiteControl, and Sleeknote.