Title: Dlit Easy Math Captcha Author: dlit Published: August 30, 2026 Last modified: August 30, 2026 --- Search plugins ![](https://s.w.org/plugins/geopattern-icon/dlit-easy-math-captcha.svg) # Dlit Easy Math Captcha By [dlit](https://profiles.wordpress.org/dlit/) [Download](https://downloads.wordpress.org/plugin/dlit-easy-math-captcha.1.5.2.zip) * [Details](https://wordpress.org/plugins/dlit-easy-math-captcha/#description) * [Reviews](https://wordpress.org/plugins/dlit-easy-math-captcha/#reviews) * [Installation](https://wordpress.org/plugins/dlit-easy-math-captcha/#installation) * [Development](https://wordpress.org/plugins/dlit-easy-math-captcha/#developers) [Support](https://wordpress.org/support/plugin/dlit-easy-math-captcha/) ## Description Dlit Easy Math Captcha adds configurable math captcha protection to: * WordPress comments * Login form * Registration form * WooCommerce product reviews * Contact Form 7 forms via [math_captcha] Features: * Answer-digit based difficulty (1-3 digits) * Configurable operations: addition, subtraction, multiplication * Question style: digits, emoji (1️⃣3️⃣ ➕ 7️⃣), or mixed * Per-integration simple one-line mode to minimize UI impact * Stateless HMAC-signed single-use token verification (no database writes on page render) * Nonce verification for submissions ## Installation 1. Upload the plugin folder to /wp-content/plugins/. 2. Activate the plugin in WordPress. 3. Go to Settings > Math Captcha. ## FAQ ### How do I use it with Contact Form 7? Add this tag in your CF7 form (the name, e.g. `captcha-1`, lets CF7 show the validation error next to the field): [math_captcha captcha-1] Optional flags (no colons): [math_captcha captcha-1 simple] – force compact one-line layout [math_captcha captcha- 1 full] – force full layout with description [math_captcha captcha-1 light] – force light text mode [math_captcha captcha-1 dark] – force dark text mode [math_captcha captcha-1 id:my-id] – set a custom HTML id on the input [math_captcha captcha-1 id:my-id simple] – combine id + compact layout [math_captcha captcha-1 simple light]– combine compact + light text mode [math_captcha captcha-1 id:my-id full dark] – combine id + full + dark text mode ### Does it support Redis or Memcached? Yes, automatically. Tokens are stored via the WordPress Transients API, so if your site uses a persistent object-cache drop-in (for example the “Redis Object Cache” plugin), tokens live in Redis/Memcached instead of the database with no configuration. The Settings > Math Captcha page shows which storage is currently in use. ### Does it work with page caching? Each captcha embeds a single-use token in the page HTML. If a full-page cache serves the same cached page to many visitors, only the first successful submission is accepted; later visitors must reload past the cache. Exclude pages with comment forms from full-page caching, or keep cache lifetimes short (under 30 minutes). ## Reviews There are no reviews for this plugin. ## Contributors & Developers “Dlit Easy Math Captcha” is open source software. The following people have contributed to this plugin. Contributors * [ dlit ](https://profiles.wordpress.org/dlit/) [Translate “Dlit Easy Math Captcha” into your language.](https://translate.wordpress.org/projects/wp-plugins/dlit-easy-math-captcha) ### Interested in development? [Browse the code](https://plugins.trac.wordpress.org/browser/dlit-easy-math-captcha/), check out the [SVN repository](https://plugins.svn.wordpress.org/dlit-easy-math-captcha/), or subscribe to the [development log](https://plugins.trac.wordpress.org/log/dlit-easy-math-captcha/) by [RSS](https://plugins.trac.wordpress.org/log/dlit-easy-math-captcha/?limit=100&mode=stop_on_copy&format=rss). ## Changelog #### 1.5.1 * Added: Question style option (Digits / Emoji / Mixed) — emoji questions like 1️⃣3️⃣ ➕ 7️⃣ break the simplest text-parsing spam bots. Display only; verification is unchanged. * Fixed: Contact Form 7 no longer burns the captcha token when another field fails validation — the token is consumed only after the whole form passes, so corrected resubmits work without reloading. * Improved: dead tokens (expired or already used) now show “please reload the page” instead of the misleading “incorrect answer”. * Fixed: the answer input stays readable on dark themes and in the CF7 light text mode (it no longer inherits light text onto its white background). * Fixed: valid HTML in the simple layout (the question is no longer a div inside a span). * Improved accessibility: the answer input references the math question via aria- describedby, numeric keyboards are requested on mobile, and the info tooltip is keyboard-reachable. * Improved: number-input spinner arrows are hidden and the tooltip wraps instead of overflowing on small screens. * Improved: the stylesheet now loads only on pages where a captcha is rendered instead of site-wide. #### 1.5.0 * Improved: redesigned settings screen — protect/layout toggles combined into one Protected Forms table with inline dependency status, corrected difficulty wording( the digit setting controls the answer; operands are auto-generated with up to one extra digit), and a live preview of both captcha layouts. * Added: Settings link on the plugin row of the Plugins screen. * Added: Token Storage status panel on the settings page — shows whether replay- protection tokens are stored in a persistent object cache (Redis/Memcached/APCu) or the database, and suggests enabling one when the server supports it. * Improved: captcha tokens are now stateless HMAC-signed values — rendering no longer writes to the database; a single transient is written only on successful verification to prevent replay. Wrong answers no longer consume the token, so visitors can retry. * Security: comment captcha can no longer be bypassed by spoofing review POST fields; product reviews are now detected from the target post type on the server. * Security: WooCommerce review submissions now have their math answer verified ( previously only the nonce was checked). * Fixed: pingbacks and trackbacks are no longer blocked by comment captcha validation. * Fixed: front-end login forms built with wp_login_form() now render the captcha instead of locking users out. * Fixed: consolidated to a single plugin main file (dlit-easy-math-captcha.php). * Improved: multiplication questions no longer degenerate to the trivial “N x 1” pattern. * Improved: captcha is no longer rendered for logged-in users who can moderate comments. #### 1.4.5 * Improved simple layout alignment and theming behavior. * Updated text domain to match plugin slug. #### 1.4.4 * Added CF7 text mode flags: `light` and `dark`. * Removed external front-end link from captcha output. #### 1.4.3 * Added CF7 shortcode layout flags: `simple` and `full`. * Added one-line compact captcha display mode. #### 1.2.0 * Added optional setting defaults for core integrations. * Updated activation behavior and admin settings flow. #### 1.1.0 * Added answer-digit based difficulty generation. * Added per-integration simple one-line display mode. * Improved comments and WooCommerce review validation flow. ## Meta * Version **1.5.2** * Last updated **3 days ago** * Active installations **10+** * WordPress version ** 5.0 or higher ** * Tested up to **7.1** * PHP version ** 7.4 or higher ** * Tags * [captcha](https://wordpress.org/plugins/tags/captcha/)[comments](https://wordpress.org/plugins/tags/comments/) [math captcha](https://wordpress.org/plugins/tags/math-captcha/)[spam protection](https://wordpress.org/plugins/tags/spam-protection/) [woocommerce](https://wordpress.org/plugins/tags/woocommerce/) * [Advanced View](https://wordpress.org/plugins/dlit-easy-math-captcha/advanced/) ## Ratings No reviews have been submitted yet. [Your review](https://wordpress.org/support/plugin/dlit-easy-math-captcha/reviews/#new-post) [See all reviews](https://wordpress.org/support/plugin/dlit-easy-math-captcha/reviews/) ## Contributors * [ dlit ](https://profiles.wordpress.org/dlit/) ## Support Got something to say? Need help? [View support forum](https://wordpress.org/support/plugin/dlit-easy-math-captcha/)