AI · alternatives · 2026
24 alternatives to Cerno – CAPTCHA that targets LLM reasoning, not human biology
Open-source TypeScript SDK for human verification. Maze interaction with motor-control analysis, 12 behavioral features scored server-side against per-maze baselines. No ML inference, no third-party calls.
Cerno is a CAPTCHA system designed to verify humans by testing reasoning abilities rather than requiring users to solve visual puzzles or other biology-based challenges. It targets large language models specifically… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
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CAPTCHA that filters out humans and only lets programs pass
2018 · humansnotinvited.com · its alternatives →
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Claude Opus 4.7 is Anthropic's most capable generally available model, released April 16, 2026. It outperforms Opus 4.6, GPT-5.4, and Gemini 3.1 Pro on key benchmarks including agentic coding, multidisciplinary reasoning, scaled tool use, and agentic computer use. It is benchmarked below Claude Mythos Preview — which remains restricted to Project Glasswing partners. https://vucense.com/ai-intelligence/ai-tools/claude-opus-4-7...
2025 · anthropic.com · its alternatives →
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OpenHuman▲549An open source AI harness built with the human in mind
May 2026 · tinyhumans.ai · its alternatives →
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Hi Hackers, Excited to share a macOS app I've been working on: https://recurse.chat/ for chatting with local AI. While it's amazing that you can run AI models locally quite easily these days (through llama.cpp / llamafile / ollama / llm CLI etc.), I missed feature complete chat interfaces. Tools like LMStudio are super powerful, but there's a learning curve to it. I'd like to hit a middleground of simplicity and customizability for advanced users. Here's what separates RecurseChat out from similar apps: - UX designed for you to use local AI as a daily driver.…
2024 · recurse.chat · its alternatives →
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Captcharoo▲88Proof of humanity, check that you're not talking with an AI
2023 · captcharoo.com · its alternatives →
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Persistent memory for Claude, ChatGPT & Cursor. Free.
May 2026 · github.com · its alternatives →
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PG has posted about improving social networks using something like an "intellectual CAPTCHA" many times [1][2][3][4] - "Make users pass a test on basic concepts like the distinction between necessary and sufficient conditions before they can tweet." I felt the same way. So I built one using a mix of simple math, logic, and Twitter/X Community Noted posts. Try sample questions here - https://mentwire.com/sample - without signing up. - Invites are temporarily open to HN users. - Onboarding test + one daily question before accessing feed, post or reply. - Posts authors are…
Apr 2026 · mentwire.com · its alternatives →
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2014 · frantzmiccoli.github.io · its alternatives →
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Combine the best AI/LLMs to build your Custom ChatGPT
2023 · edenai.co · its alternatives →
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2014 · hashcash.io · its alternatives →
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2011 · thecaptchaexperiment.com · its alternatives →
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DeltaMemory▲104Most AI agents forget everything between sessions. We built DeltaMemory to fix that. It's a cognitive memory layer that gives agents persistent recall, automatic fact extraction, and temporal reasoning — via a single SDK call. Key numbers: - 89% accuracy on LoCoMo long-term conversation benchmark - 50ms p50 retrieval latency - 97% cost reduction vs raw token re-processing Open source SDKs, works with any LLM stack. Currently in early access. Happy to answer questions about the architecture, benchmark methodology, or how we handle knowledge graphs.
Feb 2026 · deltamemory.com · its alternatives →
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GeeTest▲68Smarter way to stop bad bots, protect websites, apps & APIs
2021 · geetests.com · its alternatives →
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Ending the CAPTCHA agony in a unique way.
2013 · areyouahuman.com · its alternatives →
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A friendly copywriting challenge between human & OpenAI’s GPT-3 for your website. Built & Brought to you by VWO, #1 A/B Testing Tool in the World.
2020 · vwo.com · its alternatives →
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I built Nocaptcha after getting frustrated with traditional CAPTCHAs both as a user and developer. WebAuthn passkeys offered a promising alternative that's both more secure and user-friendly. What makes Nocaptcha different: - Uses WebAuthn standard instead of puzzle-solving - No need for users to remember passwords or solve puzzles - Open source Current limitation: Working with W3C WebAuthn Community Group on true passkey disposal for this use case. Looking for feedback particularly on: 1. Integration experience 2. User experience compared to traditional CAPTCHAs
2024 · github.com · its alternatives →
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Hassle-free CAPTCHA. Stop Bots, Stay Secure.
2023 · dashboard.leminnow.com · its alternatives →
- 22BC
2013 · boundit.co · its alternatives →
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Hey HN, I have been working on a side project for the last 3 months, built around LangchainJS and pgvector. It now supports ChatGPT, Llama, Claude, and Bison models, and the bot can integrate with WhatsApp, Telegram, and Discord for now. I would really appreciate some feedback. Thanks! repo: https://github.com/n4ze3m/dialoqbase
2023 · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →