ZeroDay Dev

ZeroDay Dev

In-app purchases

About this app

Learn to break things — before attackers do.

ZeroDay Dev teaches secure coding and blockchain security through 1,000+ hands-on challenges. Learn from 30+ real-world exploits: Beanstalk, Indexed Finance, bZx, VeilCash, Sigma.Money, Bybit, and more. Each exploit is linked to verified incident records so you learn from actual on-chain events, not hypotheticals.

WHAT YOU'LL LEARN
• Exploits — Reentrancy, oracle manipulation, flash loans, proxy races
• Solidity — Proxies, storage collisions, OpenZeppelin, core security
• Rust — Ownership, borrowing, error handling, async
• DeFi — AMMs, lending, oracles, vaults
• Solana — Account model, security, Anchor
• Cybersecurity — Web security, HTTP smuggling, OWASP

HOW IT WORKS
• Practice — Tap, drag, or select. Quick feedback, no docs required.
• Exam — Timed tests across domains with performance tracking.
• Lightning Round — Sprint mode with interactive-only questions.
• Streaks & XP — Daily streaks, badges, and progression keep you consistent.

BUILT FOR DEVELOPERS
• Offline-first — Learn on the subway, no Wi‑Fi needed.
• No account required — Start immediately.
• 30+ real-world exploits — Beanstalk, Indexed, bZx, VeilCash, Bybit & more.

A zero-day is a vulnerability unknown to the vendor — they have zero days to patch it. We teach you to find and fix them before attackers do.

What’s new

First full public release of ZeroDay Dev.
Includes new study widget support, content updates, exploit learning improvements, navigation polish, and general performance and UX fixes.