Bots are much more intelligent nowadays. Spammers can easily send a lot of spam email using bots if you use captcha-free contact form. reCaptcha, a simple tool for for managing bots submissions can save your inbox from spam mail.
weForms allows you to create WordPress forms with reCaptcha. With it, you can easily keep your form submission safe from spammers.
Adding reCaptcha to A Form
If you like to add reCaptcha on your contact form, please navigate: wp-admin → weForms → Settings → Insert your reCaptcha Site key and Secret Key, and Save them. [Simply generate your API Keys if you don’t have yet]
Now, navigate to wp-admin → weForms → All Forms → edit/create a form → drag & drop the reCaptcha field from others section to your form area.
Add the field level & save the form.
Here is the preview!