Omni Contact Form
Omni Contact Form is a WordPress plugin for people who want a basic contact form. It aims to be light and simple to use.
[omni-contact-form] to a post or page to display the form. This shortcode generates the default form: two fields (email address and message) and a button to send the message.
You can customize the form by using a number of shortcode attributes. See the full documentation at GitHub.
Configuration via shortcode attributes (there is no settings page)
Required fields only: if a field is in the form, it must be filled
Submission via Ajax (no page reloads)
Clean and simple error messages
Basic anti-spam protection by default
Optional multiplication quiz for additional anti-spam protection
Printable copy of the message displayed after submission
PHP 7.0 or newer
WordPress 4.9.9 or newer
WordPress REST API (part of WordPress since version 4.7)
Browser released after 2012