An indie app studio

Cozy apps for quiet moments, slow mornings, starry nights, and brighter days.

Star Synthesis makes small, thoughtful apps for iPhone and Android, each one built to fit gently into your day.

Our Apps

Made by a tiny team, with a lot of care.

Better sleep & focus

Wind down at night and stay in the zone by day.

A cozy walking game

Your real steps power a cozy RPG. Fish, mine, forage, and collect slime pets.

Learn Japanese

Read hiragana, katakana and kanji with a friendly bunny, one short lesson at a time.

Questions, feedback, or an idea for a feature? We read every message.