The Master Key System

Name: The Master Key System
Rating: 4.714286 (289 reviews)
Author: MagicBooks Editora

MagicBooks Editora

★ 4.7 (289 ratings)

⬇ 50,000+ downloads

Est. actual: 75,925

Free

Released: Aug 25, 2012

No in-app purchases

Contains ads

Signals

4 this week · 1 positive · 2 warnings All of this week's signals →

📈Last 7 days +34 installs — 24% slower than the week before (+45) · 4/day since Oct 9
🏆Among Books & Reference apps top 20% by installs gained this week (326 peers growing)
⭐Rating steady at ★ 4.71 since Oct 9
🛠Updates dormant · updated 440 days ago

Installs since launch

+125 installs · 0 ratings since Oct 9

Update history

4.0 Aug 27, 2025 · seen Oct 17, 2026

Only the current version so far — new entries appear as the app ships updates.

The Master Key System is a books & reference app by MagicBooks Editora with 50,000+ downloads (about 76K estimated). +34 installs in the last 7 days. Rated 4.7 from 289 ratings. Released Aug 25, 2012. Install growth, rank history, SDKs and ad networks.

From the store listing: “The Complete Book, 1st Edition 1916 - FREE”