About this app
Code examples for 13 programming languages and SQL, organized by task. Look up how something is done in a language you don't use every day and get a working snippet — not a wall of theory. About 5,000 examples in 26 sections that follow how developers think: collections, control flow, generics, concurrency, regular expressions, files, databases, serialization, algorithms, design patterns, reflection, LINQ. LANGUAGES Swift, Kotlin, Java, Objective-C, C#, C++, Go, Rust, Python, JavaScript, TypeScript, PHP, Ruby, and SQL. WHERE IT HELPS • Switching languages. The topic tree is identical everywhere: find the pattern you know in one language, see how it is written in another. • Interviews and exams. The tree covers the questions that come up most often. • Syntax you touch twice a year. Date formatting, regex groups, JSON serialization, thread pools, file I/O — a couple of taps instead of a search session. WHAT'S INSIDE • Examples with the expected output shown inline, so you can check the result without running them. • A separate SQL section: 201 queries with result tables and short explanations. • Search by topic name or by a fragment of code. • Works fully offline. No account, no sign-in. • Favorites for the snippets you come back to. • Optional links to online playgrounds when you want to run something. • Light, dark or system theme; adjustable font and size; optional line numbers. • On iPad: topic list and code side by side. • Interface and content in 15 languages. In development since 2015.
Latest release
What’s New
• All languages are available from the first launch — the bar used to be trimmed to what fit the screen, now the full list scrolls. • Theme: As System, Light or Dark. It now applies to the whole app, not only to the code. • More room for the code: a compact language bar on iPhone, full-screen code in landscape, and a draggable divider on iPad. • Code fits the screen width. Long lines scale down to a readable minimum, short examples keep your font size. • The title shows the path to the topic, so it is always clear where you are. • Switching languages keeps your place: going to SQL and back no longer resets the topic list. • Language icons redrawn as vectors — sharp at any size.
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 21, 2026 · 9:24 AM $4.99
Screenshots
