Cerno
CAPTCHA that targets LLM reasoning, not human biology
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HN · launched Mar 31, 2026 · 12 upvotes (top 36%) · 0 views
Niche: bot detection and captcha software · 32 launches, 5 in the last 7 days · Explore this niche →
Category and tags
- Security
- Compliance & governance
- B2B
- AI-native
- Commercial product
Visit website ↗ Source listing ↗
More like this: all 32 launches in bot detection and captcha software →
Could you build this?
Partial The web UI and maze canvas are straightforward, but building a robust anti-bot classification engine based on human motor control trajectories requires extensive ML behavioral modeling and adversarial protection.
What it would actually take: A production CAPTCHA requires high-frequency pointer event capture on the client, anti-tampering/cryptographic proofs to avoid replay attacks, and backend classifier pipelines (LSTM or Transformer models) trained on large datasets of human vs. synthetic mouse trajectories. Implementing this reliably requires security and bot-detection engineering expertise.
Discussion
20 comments analyzed.
Concerns raised: Fails on touchscreen and mobile devices, Inaccessible for users with disabilities or limited dexterity, Finger obscures maze while drawing, requires memorization, Doesn't work with trackpads or trackball mice, Rejects valid solutions inconsistently
Feature requests: Alternative verification pathway for assistive devices, Better tolerance for minor path imprecision, Mobile/touchscreen optimization
Competitors
Other products that read as similar to this one : 1627 launches clear the similarity bar, closest 8 shown.
Attention rank: #546 of 1628 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 152 days after the earliest competitor.
- BonzAI · hn · 2026-05-22 · 5 upvotes · similarity 0.59
- CaptchaX · github · 2026-09-17 · 19 upvotes · similarity 0.58
- Captcha to detect bots with a simple question · hn · 2026-04-09 · 5 upvotes · similarity 0.57
- x9-gpt · github · 2026-09-11 · 10 upvotes · similarity 0.55
- Tokensift, an open-sourced token-efficiency linter for LLM prompts · hn · 2026-08-29 · 6 upvotes · similarity 0.54
- CTON: JSON-compatible, token-efficient text format for LLM prompts · hn · 2025-11-20 · 13 upvotes · similarity 0.54
- KillSwitch · hn · 2026-09-19 · 10 upvotes · similarity 0.53
- ReasonGate- An explainable gate that blocks LLM prompt injection · hn · 2026-07-16 · 7 upvotes · similarity 0.53
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