by EverPress 0 (0 reviews)

Mailster Cool Captcha

Name: Mailster Cool Captcha
Author: EverPress

Add a self-hosted image captcha to Mailster newsletter signup forms—block bot subscriptions without Google API keys.

Mailster Cool Captcha ranks #9,936 among WordPress.org plugins with 400+ active installations, is #254 of 1,659 in the Authentication category, and was last updated Oct 14, 2026. Data from WordPress.org, refreshed twice daily — see methodology.

Compatible with WP 7.1.4

v1.4.0 Current Version v1.4.0

Updated 3 weeks ago Last Update on 14 Oct, 2026

Refreshed 8 hours ago Last Refreshed on

#254 of 1,659 in Authentication Top 25% by installs Downloads -14.9% this week Actively maintained

View on WordPress.org

Rank

#9,936

— No change

Active Installs

400+

-5.9%

KW Avg Position

73.5

— No change

Downloads

6.5K

+9 today

Support Resolved

— No change

Rating

Review 0 out of 5

0 (0 reviews)

Next Milestone 500

Total Progress 34%

400+ 500+

1,539

Ranks to Climb

Growth Needed

8,000,000

Active Installs

Pro

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Rank Changes

Current #9,936

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Active Installs Growth

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Active Installs 0,000,000+

Growth +0.0%

Peak 0,000,000

Downloads Growth

Downloads

Growth

Peak

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Reviews & Ratings

0.0

0 reviews

Overall 0%

0 (0%)

Security History

Source: WPVulnerability

No known vulnerabilities on record for Mailster Cool Captcha. Checked 3 months ago.

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Plugin Details

Version: 1.4.0
Last Updated: Oct 14, 2026
Requires WP: 6.0+
Tested Up To: 7.1.4
PHP Version: N/A
Author: EverPress

Support & Rating

Rating: ☆ ☆ ☆ ☆ ☆ 0
Reviews: 0
Support Threads: 0
Resolved: 0%

Keywords

captcha forms mailster newsletter spam

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TL;DR

AI summary of the plugin's readme

This plugin is for site owners running Mailster newsletter subscription forms on WordPress. It adds a Cool Captcha to those forms to help block spam signups.

Adds Cool Captcha to forms
Integrates with Mailster subscription forms

Frequently Asked Questions

Common questions about Mailster Cool Captcha

No. Mailster Cool Captcha is an addon for the Mailster Newsletter Plugin and requires Mailster 2.3 or newer.

Cool Captcha shows a distorted image and text field on your site and validates the answer on your server. Mailster reCaptcha uses Google reCAPTCHA v3 and requires Google site and secret keys. Choose Cool Captcha if you want a self-hosted challenge without Google.

No. The captcha image is generated on your WordPress server. Verification compares the visitor’s input to a value stored in the PHP session for that form—no external captcha API call is made.

The bundled image generator uses PHP’s GD functions (for example imagecreatetruecolor). Your hosting environment must have GD enabled for captcha images to display.

Yes. Enable Disable for logged in users on the Cool Captcha settings screen.

Enable captcha per form on Newsletter → Settings → Cool Captcha by selecting the forms in the Forms list. Only checked forms show the challenge.

For Mailster and this addon, see mailster.co.