~/zeroday $

YOUR PRIVATE
AI TUTOR
FOR SECURITY

Learn from 200+ real exploits, AI jailbreaks and supply-chain attacks. Ask follow-up questions, inspect vulnerable code, and practice with 8,600+ challenges and hands-on labs. Local AI. Encrypted learning. Free.

October 30 source snapshot: 213 Build lessons and 138 Deep Dive journeys across 19 shelves. Counts reflect the latest app content; store rollout is pending. See what is coming.

▶ Download on App Store — Free ▶Download on Google Play — Free

Mobile learning for developers and security learners · Offline-first · No ads · No subscription · All learning content free

See install and pricing, the iPhone web3 learning app guide, the full feature docs, or Exploit-Data.

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Tutor

LOCAL MODEL · PRIVATE CHAT

You

What should I study next?

Tutor · illustrative response

Choose an incident, review the cause, then try its exercises.

What would you like to focus on: AI security, software supply chains, or crypto?

Your device. Your encrypted vault.

ZeroDay Dev — Practice exploit challenge (Yearn yETH infinite-mint)
Practice and learning previews · interface may vary by version
ZeroDay Dev — Practice exploit challenge (Yearn yETH infinite-mint)
Try the app

Sample ZeroDay Dev

Explore a guided iPhone-style demo: answer a practice question, inspect a real exploit, try a drag-and-drop exercise, preview local Tutor, open an exam, browse the glossary and references, and peek at a Deep Dive track.

11:47 •••⌁
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Widgets

Learn on your Home Screen

  • Recent exploits for quick incident review
  • Glossary terms across domains like Machine Learning, Solidity, and DeFi
  • Tutorial checklists for topics like OpSec and wallet safety
Helpful Prompts

Learn with your local AI Tutor

  • HOW TO starters, exploit study and follow-up questions with your installed local model
  • Choose which Tutor starter sections you want to see
  • App-source references help you check answers; citations can be missing or incorrect
On-Chain Guide

On-chain references, fast

  • Browse on-chain reference guides without leaving the learning flow
  • Quickly check network details, concepts, and patterns while reviewing security topics
  • Built to feel like a lightweight field guide when users need grounded context fast
FAQ
Is ZeroDay Dev free?
ZeroDay Dev is free. All learning content is included, with no subscription or paid unlock.
What is included?
All learning domains, challenges, exploit studies, Deep Dives, exams, Ops, War Rooms and glossary content are included free.
Do I need an account?
No. ZeroDay Dev does not require an account to start.
Does it work offline?
Yes. ZeroDay Dev is designed to be offline-first for short study sessions on a phone.
Is the content based on real exploits?
Yes. ZeroDay Dev includes 200+ real-world exploits from protocols and incidents such as Pump.fun, Balancer, Yearn, Beanstalk, Indexed Finance, Wormhole, and Jito.
How do I install ZeroDay Dev?
Use the App Store or Google Play links on this page, or open the install and pricing page for the canonical download flow.
Will I lose progress if I reinstall or change phones?
Vault keys are bound to this device and private vault data is excluded from backups. A new phone, lost keys or an erased vault means starting again; there is no cloud restore or forgotten-PIN recovery. Reinstallation must not be relied on to preserve access.

Your learning. Your device.

A Tutor that runs locally

Download or import a compatible model once, then use the Tutor on your device without a cloud AI account. Bundled lessons work offline; model and paper downloads, external links and optional online tools need a connection. Start with HOW TO, study an exploit or work on weak areas. Continue the conversation without sending it to a cloud AI service. Responses can be wrong; check the source material.

An encrypted chat vault

Your chats, progress and private app data stay in a PIN-protected encrypted vault on your device. The vault uses SQLCipher with AES-256 and authenticated AES-GCM encryption for protected files and key wrapping. Local inference keeps Tutor conversations out of cloud AI services. You control model imports, saved chats and deletion. No account, advertising or learning analytics.

Measured on a phone

Qwen2.5 1.5B Instruct (Q4_K_M) measured about 12–13 tokens/second on iPhone 14 (October 30, 2026). Only 2 of 4 latest fresh conversation checks passed; this small evaluation is not a general accuracy score or release qualification, and Android performance is unmeasured. Method and limits.

zero-day

A vulnerability unknown to the vendor—they have zero days to patch it before it’s exploited. We teach you to find and fix them before attackers do.