Green Key Universe

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Apps: 5

Total installs: 4.1M

Avg rating: ★ 4.01

Ratings: 42K

Latest release: Dec 30, 2025

How this developer operates

Carrier title Speed Reading — brain training holds 92% of the developer's installs — a one-app developer
Hit rate 40% of launches reach 100k installs (2 of 5 at least 30 days old)
Release rhythm a new app every ~2.2 years on average
Maintenance 2 of 5 apps updated in the last 90 days · last update 18 days ago · updates every ~154 days

All apps

App	Style	Rating	Installs	Released
Speed Reading — brain training	Education	★ 4.4	1,000,000+	Feb 6, 2017
Русский язык. Орфография	Education	—	100,000+	Nov 21, 2017
Schulte Table: Speed Reading	Education	★ 4.4	50,000+	Mar 10, 2021
Librain	Education	★ 3.2	50,000+	Sep 11, 2017
LifeBalance: Habit Tracker	Productivity	—	10,000+	Dec 30, 2025