Yes, INBOX Forms is free to use. It is available as a free plugin on WordPress.org.

How many websites use INBOX Forms?

INBOX Forms has 50 active installations as tracked by WordPress.org.

What are the best INBOX Forms alternatives?

Popular alternatives to INBOX Forms include MC4WP: Mailchimp for WordPress, MW WP Form, MailerLite – Signup forms (official). You can compare them side-by-side on our comparison pages.

Does INBOX Forms work with the latest WordPress?

INBOX Forms has been tested up to WordPress 5.8.13. It requires WordPress 3.0.1+ and PHP 7.2.5+.

PluginSift

INBOX Forms

Name: INBOX Forms
Author: INBOX

Add newsletter sign up forms to your WordPress site. Subscribers will be saved directly to your Inbox account. Super easy to set up!

By INBOX·Form·Free

·50 active installs·Updated 4 years ago

Download Compare

As of April 2026, INBOX Forms is a WordPress form plugin with 50 active installations and a 0/5 rating0. It has been downloaded 1.7K+ times in total. Requires WordPress 3.0.1+ and PHP 7.2.5+. Available on WordPress.org since 2021. Last updated 4 years ago — may have compatibility concerns. Top alternative: MC4WP: Mailchimp for WordPress.

0/5Rating

50active installs

1.7K+total downloads

5 yearssince 2021

Overview

Inbox Form WordPress plugin

The Official Inbox Form plugin makes it easy to grow your newsletter subscriber list from your WordPress blog or website. The plugin automatically integrates your WordPress form with your Inbox email marketing account.

If you don’t have Inbox account yet, you can signup for a FREE here.

Once you activate the plugin, you’ll be able to select and add any of the pre-built forms from your Inbox account. You can place the form in the sidebar using a widget or use a shortcode to put it wherever you want.

Setup is fast and easy! You just need to enter your Inbox account API Key and you’re all set.

Plugin features include: