ZeroDay Dev

Learn to break things — before attackers do. ZeroDay Dev teaches secure coding, blockchain security, and AI/LLM security through 8,000+ hands-on challenges. Learn from real-world exploits — Beanstalk, Indexed Finance, bZx, VeilCash, Sigma.Money, Bybit, and hundreds more — each linked to verified incident records so you learn from actual on-chain events, not hypotheticals. Practice — Build exploit intuition without reading docs first. Tap vulnerable lines, drag tokens into code, get instant feedback. Filter by domain (Exploits, Solidity, Rust, DeFi, Solana, AI Security, Cryptography, Networking, Mobile Security) or difficulty. AI Tutor — Ask questions and get answers grounded in the app's own content, powered by a language model that runs fully on your device. Nothing leaves your phone, no account, no API key. Exercises & Build Labs — Full code challenges with reference solutions, plus real shell/Rust build labs you run and verify yourself. Deep Dive Hub — Dozens of curated learning tracks across Web2, Web3, Rust, ZK proofs, trading, AI security, networking, mobile security, cryptography fundamentals, and personal privacy/OpSec (travel routers, device seizure, digital estate planning, mixers and sanctions). Recommended tracks driven by your weak areas, or build your own from bookmarks and missed questions. Papers Library — Nearly 100 foundational and cutting-edge papers (Paxos, Raft, zero-knowledge systems, cryptography, ML) with reading progress tracking and offline PDFs. Practical How-Tos — Step-by-step checklists for real situations: phishing response, wallet hygiene, password managers, hardware security keys, emergency incident response, and more. Exam — Prepare for real security assessments. Timed tests across domains with performance tracking. Memory-match decks for opcodes, EIPs, and security terms. Streaks & XP — Daily streaks, badges, and progression keep you coming back. Private by design — Everything lives on your device. No account required — start immediately. Lock the app itself behind a PIN or biometrics.