OptinMonster is a lead-generation plugin for your website or blog. It allows you to create effective & attention grabbing forms. Convert your visitors into subscribers and customers! It comes with many tools such as: lightbox popups, floating footer bars, slide-ins & much more.
1. Create or login to your OptinMonster account and go to Integrations.
2. Find MailerLite in the list and click "Add New account".
3. Enter your MailerLite API Key. That's it, you're connected!
Now when you use OptinMonster you can choose to transfer subscribers between two services and select in which app you want to save new leads.