249+ iOS apps curated and reviewed
With an average user rating of 4.2★, the system design refresher category is one of the App Store's strongest. Browse all 249+ apps we track, sorted so the most loved ones surface first.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | — | No | No | Jun 2026 | |
| 2 |  | Free | — | No | Yes | Oct 2026 | |
| 3 |  | Free | 5.0★ (33) | No | Yes | Oct 2026 | |
| 4 |  | Free | 4.3★ (536) | No | Yes | Oct 2026 | |
| 5 |  | Free | 4.4★ (17) | No | No | Oct 2026 | |
| 6 |  | Free | 1.0★ (2) | Yes | Yes | Jul 2026 | |
| 7 |  | Free | — | No | No | Oct 2026 | |
| 8 |  | Free | — | No | No | Oct 2026 |
Prepare for software engineering interviews with structured learning paths, practical guides, and interactive quizzes. Gain confidence in system design, data structures, algorithms, and behavioral questions. Access real interview experiences and community insights.
