Use cases: form spam protection for contact, login and sign-up
Three uses of Antisy, with no puzzle for the visitor: form spam protection for a contact form, a login page and a sign-up form. Access is by waiting list. The API and the dashboard (in French) have been in service since 27 October 2026, hosted at Infomaniak in Geneva; no customer is in production yet.
Stop contact form spam, without a puzzle
Antisy stops contact form spam by checking that a message comes from a browser and not from a program. The visitor sees nothing: no checkbox, no puzzle. Your server receives a verdict,
allowordeny, before recording the message.Protect a login page from credential stuffing and automated account takeover
Credential stuffing tries, in bulk, on your login page, passwords stolen elsewhere; brute force tries a great many on a single account. Antisy checks that each attempt comes from a browser and not from a program, without showing anything to the person signing in.
Protect a sign-up form from fake sign-ups, fake accounts and abuse
Fake sign-ups come from programs that create accounts in bulk on a sign-up form. Antisy checks that each sign-up comes from a browser and not from a program, before the account is created, with no puzzle for the person signing up.
Weighing it against another check? The comparison sets Antisy beside reCAPTCHA, Cloudflare Turnstile, hCaptcha and Friendly Captcha, point by point and source by source.
See also: Documentation · Frequently asked questions · Pricing