ZeroDay Dev vs FlipStudy

Learn to break things—before attackers do. ZeroDay Dev teaches secure coding and blockchain security through 4,000+ hands-on challenges. Learn from 120+ 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. Practice — Build exploit intuition without reading docs. Tap vulnerable lines, drag tokens into code, get instant feedback. Filter by domain (Exploits, Solidity, Rust, DeFi, Solana) or difficulty. Exercises — Full code challenges with reference solutions. Deeper dives when you're ready. Exam — Prepare for real security assessments. Timed tests across domains with performance tracking. Memory-match decks for opcodes, EIPs, and security terms. Deep Dive Hub — Curated learning tracks for Web2, Web3, Rust, ZK Proofs, and Trading. Recommended tracks driven by your weak areas. Build your own from bookmarks or missed questions. Streaks & XP — Stay consistent and level up. Daily streaks, badges, and progression keep you coming back. Offline-first — Learn on the subway, no Wi‑Fi needed. All content lives on your device. No account required—start immediately. Covers reentrancy, oracle manipulation, flash loans, proxy races, ZK trusted setup, and more. Rust, Solidity, DeFi, Solana & cybersecurity.

FlipStudy is a bright, friendly flashcard app for students and language learners. Make a deck, add cards, and study with spaced repetition (a Leitner box system) that brings back the cards you miss more often — so you spend your time on what you haven't learned yet. FOUR WAYS TO STUDY - Flip: see the question, flip for the answer - Type It: type the answer from memory (small typos are forgiven) - Quiz: pick the right answer from a few choices - Match: race to pair every question with its answer ADD WORDS IN SECONDS Paste or type a list of words and FlipStudy writes a kid-friendly definition for each (FlipStudy Pro, with Apple Intelligence). Check them, change any you like, and they're in your deck. TRANSLATE AS YOU GO Type the English side of a card and let the built-in translator fill in the other side — Italian, Spanish, French, German, Portuguese, Japanese, or Chinese. It runs on your device: free and private. Prefer to type the answer yourself? You can. HEAR IT SPOKEN Tap Listen to hear the answer read aloud in its own language, not an English voice — or say the answer out loud and FlipStudy checks it. KEEP THE STREAK GOING - A daily goal and a streak to come back for - An optional daily reminder, only on days something is due - A Home Screen widget that shows the cards waiting for you MAKE IT YOURS Give every deck its own color and emoji, and pick FlipStudy's app icon — an A+ or a 100, in nine colors. ON ALL YOUR DEVICES Your decks sync through your own iCloud account to your iPhone and iPad. PRIVATE BY DEFAULT No accounts. No ads. No analytics. Your decks stay on your devices and in your own private iCloud, and the Apple Intelligence features run on your iPhone. An optional cloud translation feature (off by default) uses your own API key and sends text directly to your chosen provider — never through us. FLIPSTUDY PRO A one-time purchase unlocks the Apple Intelligence features: make a deck from a typed subject, turn a photo of a page into cards, and write definitions for your words. Requires an iPhone with Apple Intelligence.