Preview
Description
System Design Refresher is a free study companion for software engineers preparing for system design interviews. WHAT'S INSIDE • 30+ system design articles covering distributed systems, databases, caching, and more • Engineering blogs from top tech companies (Google, Meta, Stripe, Airbnb, and more) aggregated in one place • AI-powered flashcards with spaced repetition • Ask AI to summarize or explain any article in plain language • Favorites, reading progress tracking, and custom RSS feeds FEATURES • Works offline — articles download for reading without internet • Dark mode, font customization, and text size controls • Face ID / Touch ID lock for privacy • Sign in with Google or Apple, or use as a guest with no account required
What's New
Version 1.6 2026-06-11
Bug fixes and improvements Technical Analysis
Package Overview Basic metadata
Bundle ID
com.ss9.SDTool Current Version 1.6
Minimum iOS 26.2
Package Size App Store Size
Package Metadata 0 / 7 version records
Detailed binary, privacy manifest, framework, and Info.plist results have not been indexed for this package yet. The verified App Store and archive metadata above remains available.
Known Version Records
0 version records with stored package metadata • 7 known version records
Stored metadata does not guarantee a package is currently available to download.
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| Not archived | App Store ID: 886805813 | Unknown | Request Version |
| Not archived | App Store ID: 885056677 | Unknown | Request Version |
| Not archived | App Store ID: 884937868 | Unknown | Request Version |
| Not archived | App Store ID: 884872365 | Unknown | Request Version |
| Not archived | App Store ID: 884417613 | Unknown | Request Version |
| Not archived | App Store ID: 884354413 | Unknown | Request Version |
| Not archived | App Store ID: 883162970 | Unknown | Request Version |