Description
Math Captcha for Gravity Forms adds a basic “what is X + Y” challenge to any Gravity Forms form, helping block automated spam submissions without relying on third-party CAPTCHA services, external API calls, or client-side JavaScript.
How it works
- Add three fields to your Gravity Forms form:
- A Number (or Hidden) field with Admin Label
num1 - A Number (or Hidden) field with Admin Label
num2 - A Number field with Admin Label
math_answer, where the visitor types their answer
- A Number (or Hidden) field with Admin Label
- Add an HTML field containing the placeholder
{math_question}wherever you want the question text to appear. - The plugin fills
num1andnum2with random numbers on each page load, replaces{math_question}with the rendered question, and validatesmath_answerserver-side on submit.
The same numbers persist across a failed-validation reload, so the question a visitor sees always matches what’s being validated.
Why server-side?
No JavaScript means no scripts to block, no client-side bypass, and no impact on page-load performance.
This plugin is independently developed and is not affiliated with, endorsed by, or sponsored by Rocketgenius, Inc. or Gravity Forms.
Screenshots
Installation
- Upload the
math-captcha-for-gravity-formsfolder to/wp-content/plugins/, or install directly through the WordPress plugin screen. - Activate the plugin through the ‘Plugins’ screen in WordPress.
- Make sure Gravity Forms is installed and active — this plugin does nothing without it.
- Edit the form(s) you want to protect and add the three fields described above (Admin Labels
num1,num2,math_answer) plus an HTML field containing{math_question}.
FAQ
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Does this work without Gravity Forms?
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No. This plugin only adds functionality on top of Gravity Forms and does nothing if Gravity Forms is not installed and active. You’ll see an admin notice if it’s missing.
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Does this send any data to external services?
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No. All number generation and validation happens entirely server-side, on your own site.
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Can I style the question text?
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Yes — the question is wrapped in a
<strong>tag inside your HTML field, so you can wrap it with your own markup/CSS in the HTML field content. -
What happens if I don’t add the math_answer field?
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The plugin checks for all three fields (
num1,num2,math_answer) by Admin Label. If any are missing from a given form, validation is skipped silently for that form, so it won’t break forms that aren’t using the captcha.
Reviews
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Contributors & Developers
“Math Captcha for Gravity Forms” is open source software. The following people have contributed to this plugin.
Contributors
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Interested in development?
Browse the code, check out the SVN repository, or subscribe to the development log by RSS.
Changelog
1.0.0
- Initial release.