@PerleLabs Middle
The AI-generated image is likely the middle one. The Leaning Tower appears slightly unnatural in lighting and texture compared to the more realistic London Eye and Statue of Liberty photos.
Alright… this is it. Final Human CAPTCHA challenge 👉👉
We saved the best for last. There are 3 images. Only ONE is AI-generated.
Your job is to tell us if it's the one on the Left, Middle, or Right.
Submit your guesses by Sat, Feb 28 at 11:59pm UTC. As usual we'll be revealing the answers on Sunday!
If you got 3+ right, we’ll share how to claim your reward next week.
@PerleLabs Left
Because it looks the most natural. The fabric texture feels realistic, the burner light is consistent and the distant balloons add real atmosphere. It feels less perfect and more like an actual photograph.
It's the final week of Human CAPTCHA: Round 7
You made it this far… but we’re not going easy on you. One of these is a real photograph of a hot air balloon, the rest is AI-generated. Can you tell which one it is?
Respond with Left, Middle, or Right and tell us why below!
Submissions close Sat, Feb 28 at 11:59pm UTC. Answers revealed Sunday.
@PerleLabs Right
The picture on the right is the real one and here is why; the natural street imperfections and realistic building textures coupled with more-organic lightning behavior all add up to portray the fact that it is actually the real image.
Perle Human CAPTCHA #6 🏎️
One of these sports car photos is real. The other was generated by AI.
Comment “left” or “right” with your guess, and tell us why 👀
Submissions close Sat, Feb 21 at 11:59pm UTC. Answers revealed Sunday.
@PerleLabs Right
The details in the background can be seen clearly, it is more natural and the buildings in the background also explain the authenticity.
@PerleLabs right
with consistent shadows, buildings following the mountain contour, and varied window and balcony details make the right image look authentically real and photographic.
Perle Human CAPTCHA #5 📸
Let’s keep your captcha streaks alive. One of these vacation photos is real, and one was generated by AI.
Which one is real? Reply "left" or "right" and explain why ↓
This week's submissions close Sat, Feb 21th at 11:59pm UTC. Both answers will be revealed on Sunday.
@PerleLabs left
The pose and details feel natural: weight on the front paws over the log, slightly messy fur with asymmetrical stripes, soft shadows from overcast lighting—classic zoo snapshot vibe.
Perle Human CAPTCHA #4
It's time to put your human judgement to the test again. One of these images of a tiger is a real photograph, one was generated by AI.
Which one is real? Reply "left" or "right" and tell us why ↓
This week's submissions close Sat, Feb 14th at 11:59pm UTC. Both answers will be revealed on Sunday 👀
@PerleLabs Left
The apple shot has really natural camera cues: a believable specular highlight, tiny surface imperfections, realistic bokeh in the background, and a convincing contact shadow/reflection on the wood.
Perle Human CAPTCHA #3 📷
One of these images of fruit is a real photograph, one was generated by AI.
Which one is real? Reply "left" or "right" and why 👇
You have until Sat, Feb 14th at 11:59pm UTC. This week's answers will be revealed on Sunday.
@PerleLabs AI
Because the scene appears overly pristine and perfectly arranged — the lighting is uniformly balanced and the textures look painterly but lack natural brush imperfections.
Perle Human CAPTCHA Round 2 ✌️
Was this landscape art created by a real artist, or AI generated?
Reply with "Human" or "AI" and tell us why!
Deadline is Sat, Feb 7th at 11:59pm UTC. This week's answers will be revealed on Sunday.
PS: Use your own judgement and trust your instincts!
@PerleLabs H
This photo looks real because the lighting and shadows are natural and imperfect. The details and readable text on the signs are consistent, which AI often gets wrong.
Perle Human CAPTCHA Round 1
Was this photo taken by a real person or generated by AI? 📸
Reply with a letter and tell us why:
H = Human
A = AI
Deadline to submit is Sun, Feb 7th at 11:59pm UTC. It's go time 👇
Think you can outsmart AI? 😏
Perle's Human CAPTCHA is here.
> Test your ability to detect AI-generated content
> 2 questions every week
> Get 3+ correct across 4 weeks to earn an exclusive badge
The real AI challenge begins. First challenge below.
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