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Virtus
Virtus
The world’s first anti-AI CAPTCHA challenge.
The world’s first anti-AI CAPTCHA challenge.
Virtus uses a visual noise generation technique that creates videos of shapes that are invisible to AI vision systems but clearly visible to the human eye.
Our lightweight challenge protects websites from bot accounts and spam, all without tracking mouse movements or using privacy-invasive AI. It’s a simple, effective way to ensure a space is human-only.
Virtus uses a visual noise generation technique that creates videos of shapes that are invisible to AI vision systems but clearly visible to the human eye.
Our lightweight challenge protects websites from bot accounts and spam, all without tracking mouse movements or using privacy-invasive AI. It’s a simple, effective way to ensure a space is human-only.
01 Try an example
01 Try an example
VIRTUS CHALLENGE
Select the true statement based on the video
Select the true statement based on the video
Easy? Go back and pause the video. In the blink of an eye, the shape will disappear.
Easy? Go back and pause the video. In the blink of an eye, the shape will disappear.
The human visual system detects temporal coherence (stability over time) while AI vision systems only analyze spatial statistics frame-by-frame. The noise in both regions is statistically identical, so AI cannot distinguish them.
The human visual system detects temporal coherence (stability over time) while AI vision systems only analyze spatial statistics frame-by-frame. The noise in both regions is statistically identical, so AI cannot distinguish them.
02 Research
02 Research
PAPER · ASTRAEA RESEARCH
Virtus: A Robust CAPTCHA Based on the Human-AI Temporal Perception Gap
Virtus: A Robust CAPTCHA Based on the Human-AI Temporal Perception Gap
0%
0%
VLM SOLVE RATE ON VIRTUS
100%
100%
HUMAN SUCCESS RATE · 52 PARTICIPANTS
4.9 s
4.9 s
MEAN HUMAN SOLVE TIME
View Research >
As the world’s first anti-AI CAPTCHA challenge, Virtus contributes to our mission of preserving the future by ensuring digital spaces remain verifiably human.
As the world’s first anti-AI CAPTCHA challenge, Virtus contributes to our mission of preserving the future by ensuring digital spaces remain verifiably human.
VIRTUS — HUMAN-EASY · BOT-HARD — © 2026 Astraea AI
VIRTUS — HUMAN-EASY · BOT-HARD — © 2026 Astraea AI