Checkli lets you create a checklist content upgrade, and grow your email list with branded email subscription forms that you can easily embed on your site. https://www.checkli.com/pro
Sumo has a huge suite of tools to grow your email list. https://sumo.com
OptinMonster is an excellent app to try, if you want to grow your email subscribers. https://optinmonster.com/
LeadPages is a very reputable tool for growing your email list. Know for being one of the best landing page builders, they also have amazing content upgrade tools. https://www.leadpages.net/
Thrive Leads is becoming extremely popular on WordPress for capturing emails. https://thrivethemes.com/leads
Content Upgrades Pro is a WordPress only plugin. It is a pretty solid tool, lots of great options and has a one time fee, which is nice. http://contentupgradespro.com/
Content Upgrade Me looks good, although I only tired the demo version so far. You can upload files, and give them away in exchange for emails on your site or blog. https://contentupgrade.me
Vyper has a content upgrade tools, and a few other tools in their suite. They are more expensive than most, but worth trying. https://vyper.io
Sleek Note is a little pricey, but has lots of options. https://sleeknote.com
MailChimp This is not their specialty, but you can link to a content upgrade to the thank you email, a subscriber gets after confirm their subscription. https://mailchimp.com
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