4BOOK.ORG

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Apps: 2

Total installs: 747K

Avg rating: ★ 4.22

Ratings: 3.9K

Latest release: Aug 23, 2026

How this developer operates

Carrier title 4BOOK keys, textbooks Ukraine holds 100% of the developer's installs — a one-app developer
Hit rate 50% of launches reach 100k installs (1 of 2 at least 30 days old)
Release rhythm a new app every ~8.9 years on average
Maintenance 2 of 2 apps updated in the last 90 days · last update 38 days ago

App	Style	Rating	Installs	Released
4BOOK keys, textbooks Ukraine	Education	★ 4.2	500,000+	Sep 23, 2017
4Book Lexi: 3000 слів English	Education	—	50+	Aug 23, 2026