# ZeroDay Dev — Learn to break things

> Interactive platform for learning secure coding and blockchain exploits. (iPhone/iPad app by John Lawniczak.)

- Source: https://appshunter.io/ios/app/zeroday-dev/id6760129673 (this page in markdown: same URL + `.md`)
- Developer: [John Lawniczak](https://appshunter.io/developer/1882793043)
- Category: Education, Developer Tools
- Price: Free with in-app purchases
- Rating: 4.80/5 from 4 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.0 · 58 MB
- Languages: American English
- Released: 2026-03-10
- Data updated: 2026-08-22
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/zeroday-dev/id6760129673/reviews.md

## What is ZeroDay Dev?

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.

## Key features

- Hands-on coding challenges
- Real-world exploit analysis
- Interactive practice exercises
- Curated learning tracks
- Progress tracking and gamification
- Offline-first functionality

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock All Content | $4.99 | one-time |


## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/zeroday-dev/id6760129673/reviews.md

### 4/5 — Game Changer

*2026-05-12*

Impressed with the glossary and exploits widget. Tight UX. Clean implementation, super snappy. Having it on the home screen makes it convenient.

### 5/5 — Pretty neat!

*2026-04-01*

Enjoyed all the latest exploit data to search through and enjoyed the memory exam section the most. :)

### 5/5 — Surprisingly thoughtful, stuck with me

*2026-03-26*

dowloaded out of curiosity and didn't expect much, but it actually held my attention longer than most apps like this. the interactions and actually tapping the vulnerable lines/code make you pause and think in a different way. some pretty funny easter eggs too. i've found myself coming back to it without really planning to, which says a lot. simple ideas but they work.

## Frequently asked questions about ZeroDay Dev

### What is ZeroDay Dev's learning methodology?

ZeroDay Dev employs a hands-on approach with over 4,000 interactive challenges and real-world exploit analysis. It focuses on building intuition through practice and offers curated learning tracks for various domains.

### How does ZeroDay Dev track user progress?

The app uses a system of Streaks & XP, daily streaks, badges, and progression to keep users engaged and motivated. It also includes performance tracking for timed tests in the Exam section.

### Can I use ZeroDay Dev offline?

Yes, ZeroDay Dev is designed to be offline-first. All content is stored on your device, allowing you to learn without an internet connection.

### What specific security concepts does ZeroDay Dev cover?

ZeroDay Dev covers a wide range of topics including reentrancy, oracle manipulation, flash loans, proxy races, ZK trusted setup, and more, focusing on Rust, Solidity, DeFi, Solana, and general cybersecurity.

### Is ZeroDay Dev suitable for beginners?

Yes, the app is designed to help users learn secure coding and blockchain security from the ground up, with interactive exercises and clear explanations of real-world exploits.

### What devices is ZeroDay Dev available on?

ZeroDay Dev is available on iPhone and iPad devices.

### How often is ZeroDay Dev updated?

The latest version is 1.9, and the app was last updated on May 14, 2026. This suggests a relatively active development cycle.

### Does ZeroDay Dev have ads?

No, ZeroDay Dev does not contain advertisements. It is a free application that focuses on providing an uninterrupted learning experience.

## Version history (last 5 releases)

### 2.3 — 2026-08-18

• Explore an offline Paper Library with curated security, cryptography, blockchain, networking, and AI research available inside the app.
• Use the new Command Deck to find practical terminal commands, understand what they do, and connect them to deeper learning paths.
• Learn how to run AI locally with a guided journey covering Ollama, model selection, quantization, privacy, security, evaluation, local document search, and hybrid routing.
• Go deeper on machine learning, AI model supply-chain threats, text watermarking, Monad, TLS, networking, VPNs, Tailscale, and quantum-resistant security.
• Build a complete Rust command-line tool through new lessons on call sites, worker channels, and a hands-on capstone.
• Browse expanded real-world incident, glossary, model, and API security coverage, including a refreshed catalog of current AI models.
• Deep Dive organization, search, Exam navigation, references, and learning-flow reliability have been improved throughout the app.

### 2.2 — 2026-07-29

- Learn Monad from the protocol up, including MonadBFT, RaptorCast, sub-second finality, parallel execution, local mempools, transaction ordering, MEV boundaries, and recent network revisions.
- Every Deep Dive now begins with concise History & Context so you can understand where a technology came from and why it matters before starting the exercises.
- Mobile Security now includes practical GrapheneOS installation and hardening guidance, plus careful setup and recovery warnings for duress credentials.
- Newer real-world incidents including AFX Trade, the Verus Ethereum Bridge, B² Network, 42DAO, and an AI model-evaluation intrusion.
- Fund-tracing lessons now cover address poisoning, exchange service boundaries, and clearer techniques for following assets across systems.
- New SBOM and tarball glossary entries strengthen software supply-chain coverage, with broader security-content and reliability improvements throughout the app.

### 2.1 — 2026-07-13

- Rust Today gives you a focused daily path with Study, guided and independent labs, short reviews, and visible daily progress.
- Spaced review brings completed Rust labs back as quick follow-up challenges so practice stays purposeful.
- Exploits adds dedicated AI and Supply Chain filters, clearer incident tags, and more accurate Live/Recent results.
- Dismissed breaking incidents are easier to recover from Home if you close one accidentally.
- Shell, Solidity, and AI Security labs now show clearer tasks and success criteria throughout each lesson.

### 2.0.2 — 2026-06-07

- Prompt Library: the Helpful Prompts area is now the Prompt Library, with your own saved prompts pinned to the top and a dedicated My Prompts shortcut on the Home screen.
- Prompt chaining: combine several prompts into one and copy them together, with a quick in-app tip so the feature is easy to find.
- Build and the Rust journey: the Rust journey now has its own filter chips at the top, the catalog is cleaner, and your Build progress (tier, solved, streak) now lives in the Stats screen.
- Build reminders: set custom practice reminders by time and by days of the week.
- New real world exploit breakdowns: GnosisPay Delay module, Gravity Bridge, and Alephium TokenBridge, plus Zcash and Sui incidents.
- New hands on labs: PGP privacy training, API security in Rust, and Linux security tracks covering filesystem permissions and systemd privilege escalation.
- New Hyperliquid deep dive, smarter next best lesson recommendations, and a smoother Deep Dive flow.
- Updated AI reference with a refreshed model landscape including the latest providers and models.
- Fixes: lock screen widget text alignment and Deep Dive dismissal.

### 2.0.1 — 2026-05-28

General updates.
- Breaking incidents notifications
- Deep Dives for PoW, PoS, Solana Staking, ZCash
- Extending Glossary Terms

## More apps by John Lawniczak

- [Mollzometer](https://appshunter.io/ios/app/mollzometer/id6765724288)

All apps by John Lawniczak: https://appshunter.io/developer/1882793043

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-22.*