Supported Features
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Dark Interface
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Reduced Motion
JavaScript Recipes
JS cheat sheet, runnable
Free · In-App Purchases
Over 590 examples with explanations: JavaScript and SQL. Over 320 of them are free, and code runs right in the app with the output shown underneath.
An everyday JavaScript reference, from strings and collections to async work and design patterns. Every example comes with an explanation, and most of them run.
• 23 sections: basic types, arrays and collections, classes, files, serialization, functions and arrow expressions, exceptions, regular expressions, async operations, databases, algorithms, design patterns.
• Run in the app: the example actually runs and the output appears under the code. Needs an internet connection.
• What changed in new versions: 10 sections from ES2015 to ES2024, with the old and the new code side by side.
• Keyword and function reference: over 170 articles, open in full, with no daily limit.
• SQL alongside: over 200 queries against a live practice database (JOIN, GROUP BY, subqueries, data types).
• Edit examples and add your own; they stay in the app and are always at hand.
• Search looks inside the code itself, not just the titles: remember a fragment and you will find the example.
• Everything except running works offline. No account needed.
WHAT THE FREE VERSION INCLUDES
12 runs and 12 edits a day; the counter resets every morning. The keyword reference is open without limits. Up to 5 examples of your own.
The full version unlocks every example, lifts the daily limits and raises the run limit to 30 a day. One purchase, no subscription.
Built by a developer for developers. In active development since 2015.
Ratings & Reviews
• Copying code is open in the free version too, with no limit.
• Supports iOS 17 and macOS 14.
The developer, Fedor Obraztsov, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
The developer indicated that this app supports the following accessibility features. Learn More
Information
- Size
- 10 MB
- Category
- Developer Tools
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later.
- iPhone
- Languages
English and 14 more
- English, Arabic, French, German, Hebrew, Indonesian, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish, Turkish, Vietnamese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- JavaScript Samples 0,99 €
- Pro Version – Unlimited 2,99 €
- SQL queries 0,99 €
- Unlock the paid topics 0,99 €
- Оperations with example 0,99 €
- Provider
Fedor Obraztsov
- Fedor Obraztsov has not identified itself as a trader for this app. If you are a consumer in the European Economic Area, consumer rights do not apply to agreements between you and the provider.
- Copyright
- © Obraztsov Fedor Alexandrovich
