S2 CAPTCHA

Verification system with interactive challenges and invisible detection.

Captcha Types
Image CAPTCHA

Image

Select matching objects from a grid of images.

Image (2-Step) CAPTCHA

Image (2-Step)

Select two matching images in a row.

Spot Difference CAPTCHA

Spot Difference

Identify subtle visual differences between images.

Jigsaw CAPTCHA

Jigsaw

Slide the puzzle piece into the correct position.

Drag & Drop CAPTCHA

Drag & Drop

Drag an item to the correct target.

Rotate Align CAPTCHA

Rotate Align

Rotate an object until it is properly aligned.

Text CAPTCHA

Text

Enter characters shown in a distorted image.

Invisible CAPTCHA

Invisible Verification

Runs silently in the background using behavioral analysis such as cursor movement, interaction timing, and activity patterns.

No Interaction Required
Audio CAPTCHA
Audio Subject CAPTCHA

Audio Challenge

Users listen to a spoken sentence and select the subject of the sentence. Designed for accessibility and as an alternative to visual challenges.

Accessibility Friendly