Codewise: Coding Practice

Codewise is the fastest way to go from zero to coding confidence — right from your iPhone, iPad, or Mac. Pick a language and start writing real code immediately. No fluff, no lengthy video lectures, no subscription. Just hands-on challenges that teach you the fundamentals through practice. LANGUAGES • Python • Swift • JavaScript • Java • Kotlin • C# • SQL (PostgreSQL) FEATURES • 280+ bite-sized challenges with instant feedback — write code, run it, see the result • Structured learning paths — Intro to Programming, Language Basics, Object-Oriented Programming, Functional Programming, and Design Patterns • Functional programming in C# — lambdas, Func and Action delegates, closures, and LINQ pipelines with Where, Select, OrderBy, and Aggregate • Design patterns in Python — Singleton and dependency injection, from a shared instance to a tiny container (new in 1.4) • Built-in code editor with syntax highlighting and live error hints for every language • Code runs on your device, fully offline — no account, no ads, no data collection • SQL challenges show results exactly like the psql tool, so what you learn transfers to real databases • Progress syncs across iPhone, iPad, and Mac with iCloud ONE PURCHASE, EVERY DEVICE Codewise is a one-time purchase. Buy it once and use it on iPhone, iPad, and Mac — no recurring fees, ever. Whether you're brand new to programming, preparing for an interview, or brushing up on a new language, Codewise meets you where you are and helps you level up one challenge at a time.