Shawn

If you’ve changed the default admin username for security reasons, publishing posts from your admin account will reveal your new admin username to unscrupulous folk.
You can <a href="http://esdev.net/wordpress-security-tip-dont-post-from-your-admin-account/" rel="nofollow ugc">read more about this on our blog</a>.
When the admin is logged in, Admin Post Reminder displays an unobtrusive reminder; informing the user they’re logged in as the admin.
This lets the admin log out and log back in as an editor or user with lesser permissions before writing or publishing a post.
Normal logged in users will not see the alert.

Admin Post Reminder

You should never publish posts from your admin account. An alert is displayed, informing the user they're logged in as admin and not to write pos …

Alessandro Lin

Captcha works fine with website cache. 
Adds Captcha Asynchronously anti-spam methods to WordPress. Include login form, registration form, lost passwordform and comments form. The asynchronously method allows captcha to work well when a page cache, server cache or plugin cache, is active.
<h3>Demo</h3>
<a href="https://captcha-ajax.eu" rel="nofollow ugc">View:</a>
<h3>Features</h3>
<ul>
<li>Captcha for login form</li>
<li>Captcha for login form obtained with the function wp_login_form(). Login form embedded in a page.</li>
<li>Captcha for registration form</li>
<li>Captcha for lost password form.</li>
<li>
Captcha for comments form
</li>
<li>
Captcha for Contact Form 7
</li>
<li>Captcha for WPForms</li>
<li>
Captcha for Forminators form.
</li>
<li>
Captcha for WooCommerce plugin. Login form, Lost Password form.
</li>
<li>
Select the letters type from the options – Capital letters, Small letters or Captial & Small letters.
</li>
<li>Select the captcha type from the options – Alphanumeric, Alphabets or numbers.</li>
<li>
Select the captcha image. Default image or Black and white or Multicolor or Icons ( 27 icons available from fontawesome.com ) or Arithmetics. See images in screenshots.
</li>
<li>
Firewall. Limit rate of failed login attempts for each IP.
</li>
<li>
Firewall. The “who is” feature for IP owner is active.
</li>
<li>
REST API
</li>
</ul>
Firewall details: 
Limit failed login attempts. 
Temporary blocks an Internet address from making further attempts after a specified limit on failed retries is reached. 
Option active for login form, login form embedded, registration form, lost password form. Select the feature in the dashboard.
REST API details: 
The following address, reachable with a browser: 
” https://your_site/wp-json/captcha-ajax/v1/transients_expired ” 
will cause the cleaning of expired transients. 
Performs this task no more than once every 2 hours, further requests will be ignored.
If your web site has a caching plugin installed or uses server-side caching, it is best to exclude the page from caching: 
” https://your_site/wp-json/captcha-ajax/v1/transients_expired “
REST API Filter for Exposing Menus Publicly in WordPress. Optional.
Captcha for Contact Form 7 details: 
1. Install and activate CF7 and Captcha Ajax. 
2. Go to Captcha Ajax settings. CF7 yes and save. 
3. Create your contact form with CF7. 
4. Edit your new CF7 contact form: 
 Click on the line before [submit “Submit”]. This positions the cursor. 
 Click on the Captcha Ajax Tag. 
 Click on Insert Tag. This inserts the shortcode of Captcha Ajax. 
 Click on Save. 
5. Add the CF7 shortcode to the page, post or text widget and save. 
6. Cache. Purge if it is active. 
Done
Captcha for WPForms details: 
1. Install and activate WPForms and Captcha Ajax. 
2. Go to Captcha Ajax settings. WPF yes and save. 
3. Create your contact form with WPForms. 
4. Add the WPForms shortcode to the page, post or text widget and save. 
5. Cache. Purge if it is active. 
Done
Captcha for Forminator form details: 
1. Install and activate Forminator form and Captcha Ajax. 
2. Go to Captcha Ajax settings. Forminator yes and save. 
3. Create your contact form with Forminator. 
4. Add the Forminator shortcode to the page, post or text widget and save. 
5. Cache. Purge if it is active. 
Done
Captcha for WooCommerce details: 
This feature is synchronized with the WordPress Login. 
If captcha for WordPress Login is enabled, captcha for WooCommerce Login module is also enabled.
<h3>Support</h3>
Thanks for downloading and installing my plugin. You can show your appreciation and support future development by donating. https://www.paypal.me/a6419

Captcha Ajax

amazing

Captcha with Ajax method for sending code. Logins, Contact forms, Comments, WooCommerce. Firewall and REST API.

Admin Post Reminder vs Captcha Ajax