What are some alternatives?
When comparing Yoast Plugins and Gravity Forms, you can also consider the following products
Wordfence - Comprehensive security plugin for WordPress.
Typeform - Create beautiful, next-generation online forms with Typeform, the form & survey builder that makes asking questions easy & human on any device. Try it FREE!
WP Rocket - WP Rocket offers a caching plugin for Wordpress.
Wufoo - Wufoo's HTML form builder helps you create online web forms. Use our web form creator to power your contact forms, online surveys, and event registrations.
Pareto Security - Pareto Security is a Wordpress Security plugin
ProntoForms - ProntoForms is a mobile business solutions application, converting paper forms onto any tablet or mobile device.