4th floor apps
Shift Work Schedule Calendar
Our flagship since 2014. Track rotating shifts with a clear calendar and widget, plus income tracking and multi-calendar compare.
Productivity Get it on Google PlayIndependent app studio · Since 2014
Practical apps for everyday life.
We build small, focused apps for Android and iOS — calendars for people who work in shifts, a private diary, a fast gallery, an offline music player. No bloat, no accounts, just tools that work.
50M+Downloads
500K+Ratings
10Apps · Android & iOS
2014Building since
Our apps
My Diary, Journal with Lock
A private daily journal with mood tracking, photos and reminders — protected by a PIN so your thoughts stay yours.
Lifestyle
Gallery — photo gallery, album
A fast, clean photo gallery with albums, a built-in editor and a private vault. Over 10 million installs.
Photography Get it on Google Play
Calendar: Daily Agenda Planner
Plan your day with tasks, events and reminders in one simple agenda view. A calendar that keeps up with you.
Productivity Get it on Google Play
Offline Player for your Music
Play the music stored on your phone — playlists, equalizer and sleep timer, no internet or subscription needed.
Music Get it on Google Play
All Language Translator
Translate text, voice, photos and live conversations in 100+ languages — with offline language packs for travel.
Tools
Shift Work Calendar
Multiple calendars for rotations and coworkers, income and hours tracking, and preset patterns for complex schedules.
ProductivityAbout the studio
Small studio. Big install base. Simple idea.
4th floor apps started in 2014 with one app: a shift work calendar built for people whose weeks don't look like Monday-to-Friday. Twelve years and 50 million downloads later, we still work the same way — pick one everyday problem, solve it with a small, fast app, and keep improving it for years. Today our apps run on both Android and iOS, work offline where they can, and respect your data.