249+ iOS apps & games curated and reviewed
With an average user rating of 4.4★, the system design refresher category is one of the App Store's strongest. Browse all 249+ apps and games 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 | 4.4★ (495) | No | Yes | Sep 2026 | |
| 3 |  | Free | — | No | Yes | Jul 2026 | |
| 4 |  | Free | 1.0★ (2) | Yes | Yes | Jul 2026 | |
| 5 |  | Free | 5.0★ (6) | No | No | Sep 2026 | |
| 6 |  | Free | 5.0★ (3) | No | Yes | Sep 2026 | |
| 7 |  | Free | 4.4★ (17) | No | No | May 2026 | |
| 8 |  | Free | — | No | Yes | May 2026 |
This app provides a daily system design question to help software engineers master essential skills for interviews and career growth. It offers clear explanations, linked resources, and a private community for learning and practice.
