WordPress (10000 programs)

Pros: No iframes. Cart customization. SEO integration. Open source.

Cons: Doesn’t work with WooCommerce. Doesn’t work with third-party Shopify apps.

Pros: Has single and double opt-in features.. Store unlimited contacts.. Create simple sign-up widgets or newsletter forms.. Works with other types of pop-up plugins..

Cons: The UI can be slow and clunky.. Generates subscribers that are not real.. Customer support is very slow and not very active.. Spam sign-up blockers are too rudimentary..