Flexyform

vs

Formidable Forms

Build forms your way and let StaticForms handle the back-end.

Constant Contact Forms allows you to create forms that are clear, simple, and mobile-optimized for every device. Choose forms that automatically select the theme and style of your WordPress site. Customize data fields, so you can tailor the type of information you collect.

A popular WordPress plugin used for building contact and registration forms for WordPress-powered websites. 

MightyForms is an online form builder that allow you to create forms to capture user data, surveys and contact information. You can save time by choosing a ready-to-use template from MightyForms' catalog. They offer order form templates, contact form templates, application templates, survey templates and more, which customized to accurately represent your brand or cause.

Ninja Forms is a freemium WordPress plugin that can be used to create any type of forms for WordPress-powered websites. The plugin integrates with many popular 3rd party services and can be used to collect registrations, email news letter signups, create surveys and much more. Ninja Forms provides a sleek UI that suits users of all technical level and simplifies the process of managing forms with WordPress dramatically.