What are some alternatives?
When comparing Optingun and Sumo, you can also consider the following products
OptinMonster - OptinMonster helps to convert abandoning website visitors into subscribers and customers.
Ninite - Ninite is the easiest way to install software.
WisePops - WisePops helps marketers build intelligent website popups and exit popups and also help to grow email list, and promote important events
ChannelAdvisor - As your partner in e-commerce success, we’re here to help you acquire more customers and land more sales than ever before. We keep our customers growing — and we have the stats to prove it.
ActiveProspect TrustedForm - TrustedForm is the original lead certification service that independently verifies the origin of Internet leads.
Pure360 - Email Marketing Software and Services