Mustafa Baykal

iOS apps for focus, productivity, and calm. Solo developer.

Attention Pulse

A daily gym for your attention. 7 drills, calm gardens, daily streaks.

EnglishCase

Learn English by cracking 1940s detective cases โ€” interrogate suspects, pick the grammatically correct question, and close the file.

Finger Mage

Draw glyphs with your finger to cast spells and survive endless waves of cute, weird monsters. One-handed, landscape, skill-based โ€” no pay-to-win. Premium (monthly, yearly with a 7-day free trial, or a one-time Lifetime unlock) adds cosmetics and quality-of-life perks only.

Only Focus

A beautifully crafted Pomodoro timer for students, creators, and professionals who want to build a real focus habit.

Only Tower Defense

A soft, strategic tower defense game with a pastel aesthetic โ€” built for everyone 4+, with no scary content, no pay-to-win, and ad-supported gameplay you can remove anytime with Only Tower Defense+ (a subscription with a 7-day free trial on the yearly plan, or a one-time Lifetime unlock).