Optingun is a lead capture tool that lets you create unlimited high-conversion forms, which you can embed in any websites you want. Its features include one-click signups with social media accounts, multi-frame forms, custom redirection, A/B testing, and more. 

By integrating MailerLite with Optingun, the leads and subscribers that are collected are automatically added to your email list, where you can later follow-up with them via automation workflows.