# Study Guide Hub — Coding guides, quizzes & notes

> Coding guides, quizzes & notes (iPhone/iPad app by Triangulum, Inc.)

- Source: https://appshunter.io/ios/app/study-guide-hub/id6771534708 (this page in markdown: same URL + `.md`)
- Developer: [Triangulum, Inc](https://appshunter.io/developer/1069222525)
- Category: Education, Developer Tools
- Price: $0.99 with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 55 MB
- Released: 2026-05-26
- Data updated: 2026-08-07
- User reviews in markdown: https://appshunter.io/ios/app/study-guide-hub/id6771534708/reviews.md

## What is Study Guide Hub?

Study Guide Hub is your pocket-sized companion for technical interview prep and everyday programming reference — built for developers who want to truly understand what they're writing.

Whether you're preparing for a coding interview, brushing up after a break, or learning the fundamentals for the first time, Study Guide Hub turns dense documentation into focused, digestible guides you can actually learn from — anywhere, even offline.

10 STRUCTURED GUIDES
• C# / .NET — type system, async/await, LINQ, generics, memory management, and modern C# features
• Python — data types, closures, comprehensions, OOP, asyncio, and the CPython runtime model
• JavaScript — types and coercion, closures, the event loop, prototypes, and modern ES features
• TypeScript — types, generics, narrowing, utility and mapped types, and strictness
• Java — core language, collections, generics, concurrency, and the JVM
• Go — goroutines, channels, interfaces, generics, and the runtime
• Rust — ownership, borrowing, lifetimes, traits, and fearless concurrency
• C++ — RAII, smart pointers, move semantics, templates, and the STL
• Scala — functional and object-oriented features, collections, and pattern matching
• Angular — components, services, RxJS, signals, routing, and app structure
• Every section pairs clear explanations with real, syntax-highlighted code examples

LEARN BY DOING
• A worked code example on every section
• "In Practice" — see how each concept is applied in real-world scenarios across finance, healthcare, logistics, and more
• Knowledge Check — a quick self-test at the end of every section

FILTER BY DIFFICULTY
• Focus any guide by Beginner, Intermediate, or Advanced
• Skip what you've mastered and drill into what you haven't

QUIZ MODE
• Multiple-choice or flashcard style — your pick
• Spaced-repetition review (SM-2) brings each question back right before you'd forget it
• Grade your recall — Again, Hard, Good, or Easy — to tune the schedule
• Fully offline; your review schedule is saved on-device

PROGRESS & FAVORITES
• Mark sections complete to track your study progress
• Favorite any section for instant access
• Saved locally — no account required

FREE & STUDY GUIDE HUB PRO
• Free: the complete C# / .NET guide, daily quiz practice, and favorites
• Unlock Pro once to open all 10 guides — Python, JavaScript, TypeScript, Java, Go, Rust, C++, Scala, and Angular — plus unlimited quiz and unlimited favorites
• A one-time purchase. No subscription, no account.

100% OFFLINE
• All content lives on your device — study on a plane, on the subway, or anywhere without a signal

DARK & LIGHT MODE
• Follows your system appearance automatically

Available in English and Spanish.

Study Guide Hub is built by Triangulum — a small team of developers who wanted better study tools for themselves.

## Pricing and in-app purchases

Base price: $0.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Study Guide Hub Pro | $9.99 | one-time |



## Version history (last 2 releases)

### 1.3 — 2026-06-05

Our biggest content update yet — five new languages and a deeper, more practical way to learn.

• Five new guides: JavaScript, TypeScript, Go, Rust, and C++
• Every guide expanded with more sections, deeper topics, and more quiz questions
• Multiple-choice quiz mode — answer, see the result, and let spaced repetition do the rest
• Knowledge Check — a quick, in-context self-test at the end of every section
• "In Practice" examples — see how each concept is used in real-world scenarios across finance, healthcare, logistics, and more
• A worked code example on every section, plus polish and stability improvements

Thanks for using Study Guide Hub!

### 1.0 — 2026-05-26

No release notes.

## More apps by Triangulum, Inc

- [Kitchen Charts](https://appshunter.io/ios/app/kitchen-charts/id6451056046)

All apps by Triangulum, Inc: https://appshunter.io/developer/1069222525

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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 2026-08-07.*