Blackfinch

How this developer operates

• Carrier title Age Calculator - Date of Birth holds 91% of the developer's installs — a one-app developer
• Hit rate 71% of launches reach 100k installs (5 of 7 at least 30 days old)
• Release rhythm a new app every ~1.1 years on average
• Maintenance 1 of 7 apps updated in the last 90 days · last update 78 days ago

Same company, other accounts · Sebastian Szczygiel

Developer names that share this developer's legal name, contact e-mail or website in the store.

Listings that changed hands

App	Direction	Counterparty	When
Calories Food Calculator	renamed	Blackfinch Mobile Apps	Nov 10, 2026
BrainScore - IQ Test	renamed	Blackfinch Mobile Apps	Nov 10, 2026
BMI Calculator	renamed	Blackfinch Mobile Apps	Nov 10, 2026
Age Calculator - Date of Birth	renamed	Blackfinch Mobile Apps	Nov 9, 2026
Age & Date Calculator	renamed	Blackfinch Mobile Apps	Nov 9, 2026
Weight Tracker+ BMI Calculator	renamed	Blackfinch Mobile Apps	Nov 8, 2026
TextCount AI Word & Letter	renamed	Blackfinch Mobile Apps	Nov 7, 2026

All apps

App	Style	Rating	Installs	Released
Age Calculator - Date of Birth	Tools	★ 4.3	10,000,000+	Mar 1, 2019
Age & Date Calculator	Tools	★ 4.2	500,000+	Jun 16, 2019
Calories Food Calculator	Health & Fitness	★ 3.8	100,000+	May 12, 2019
Weight Tracker+ BMI Calculator	Health & Fitness	★ 4.6	100,000+	Nov 5, 2020
BMI Calculator	Health & Fitness	—	100,000+	Jul 16, 2020
BrainScore - IQ Test	Education	★ 3.4	10,000+	Oct 8, 2025
TextCount AI Word & Letter	Productivity	—	1,000+	Jan 12, 2025