WordPress (10000 programs)

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..

Pros: Free to download and use. Suitable for beginners. Plug and play format. Increases the speed of WP websites.

Cons: Requires bug fixes.