Decoy Font
Points and comments are a snapshot, not live.
A TTF font hides typed messages in plain sight using hybrid image spatial frequency illusions.
Decoy Font is a free TTF font that prints a decoy letter for every typed character, using spatial frequencies to encode two messages in the same glyph. Up close, thin outlines show the decoy; from a distance or when squinting, blurred low-frequency masses reveal the hidden message. The font is derived from DejaVu Sans Mono and aims to obstruct AI and OCR systems. The author tested it against ChatGPT and Gemini, finding both LLMs struggled when reading screenshots. It is one of several anti-AI experiments at Mixfont, alongside Ghost Font.
What commenters are saying
Many commenters found the font cool but practically unreliable. Several tested it against LLMs and reported mixed results: some models read both messages, others failed. Commenters noted it breaks screen readers and accessibility, and one wrote a script to trivially decode the font. A split emerged between those arguing it's a fun art project and those pointing out it's easily defeated by simple image processing or future training. Some highlighted usability issues, as the font hides the message from the typist too.