The thing is even a contact form without something like reCaptcha is doomed on today's web: spam all day.
If it's just a contact form on some random site that isn't particularly valuable to spammers, a bespoke solution like hidden input fields, obfuscation, or some kind of token calculated client-side by JS will probably work just as well.
alt Hacker News
If it's just a contact form on some random site that isn't particularly valuable to spammers, a bespoke solution like hidden input fields, obfuscation, or some kind of token calculated client-side by JS will probably work just as well.