One of the newer options for protecting spam on your site is Human Presence. Unlike using a captcha service on-site forms the spam protection is invisible to site users and a frictionless experience. The service also integrates with a number of other platforms and CMS such as Magento, Drupal, and Shopify.
The free version of the Human Presence plugin and service supports the following WordPress, WooCommerce, and form types. If you are using the community version then you can protect comments or one form on your site.
WooCommerce Product Reviews
Contact Form 7
WP Fluent Forms
If you upgrade to the pro version of Human Presence it will include unlimited form support so that all forms being used on your site are protected.
After you have installed and activated the plugin you will need to set which form is protected on the site if you are using the free plan.
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Human Presence is not complex to setup and is a solid option to protect your site from spam.