Easy Captcha plugin is basic captcha plugin to prevent spam submissions. Using Shortcode you can show Mathematical Expression to be solved in your form to prevent spam.
Features
Admin can specify where the captcha should be displayed i.e, comments, login, registration or lost password form.
Admin can select arithmetic operations from available options – Addition, Subtraction or Multiplication.
Note
By default ‘Addition (+)’ operation is enabled. It’s recommended to keep at least one option selected at any point of time.
If you find any bugs, kindly report here: https://github.com/SushantRT/easy-captcha/issues