LessonOS: Attendance Tracker

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In-app purchases

About this app

LessonOS is a simple, offline attendance and student management app for trainers, coaches, and small studios. Track class attendance, check students in with a single tap, schedule recurring classes, and manage credit packages — all on your phone, with no account and no internet required.

Built for instructors who'd rather teach than fight a spreadsheet, LessonOS keeps your students, classes, and attendance organized in one fast, private app.

WHO IT'S FOR
• Martial arts schools — kungfu, karate, taekwondo, BJJ, and judo dojos tracking student attendance and class credits
• Coaches and private tutors — sports, music, dance, and academic instructors managing class rosters
• Gyms and fitness studios — yoga, pilates, and personal training studios checking members into classes
• Any small training business that wants to replace a paper notebook or spreadsheet — without a $40/month subscription

KEY FEATURES
• Student management — add, search, and organize students with status and per-student analytics
• Recurring class scheduling — set up weekly classes (e.g. Tue/Thu/Sat) and auto-generate every session
• One-tap check-in — tap to check students into a class, with undo for mistakes
• Attendance tracking — see who attended each class and keep an accurate roster
• Credit packages — sell class passes (10-class card, 20-class card) and deduct credits automatically
• Leave requests — record and approve student absences and make-up credits
• Attendance analytics — spot who's showing up and who's drifting away before they quietly stop coming
• CSV import & export — migrate from a spreadsheet in minutes
• Backup & restore — keep your data safe with Google Drive backup
• Multiple branches — manage more than one location or training center
• 7 languages — English, Chinese, Japanese, Spanish, Malay, Indonesian, and French

WHY LESSONOS
• Offline-first — works with no internet; your data stays on your device
• No account needed — open the app and start; no sign-up, no email, no password
• No subscription — free for up to 15 students, then a one-time unlock for unlimited. No monthly fees, ever
• Private by design — your student data is stored locally, never held hostage in someone else's cloud
• Fast and lightweight — built for trainers and instructors, not accountants

Whether you run a martial arts dojo, coach a sports team, teach private music or dance lessons, or operate a small fitness studio, LessonOS gives you a clean, offline tool to manage students, take attendance, track check-ins, and sell class credits — without the overhead of bloated studio-management software.

Download LessonOS and bring order to your classes today.

What’s new

Maintenance update.

• Updated for the latest Android version for better compatibility and security
• Updated in-app purchase system to Google's latest billing library
• Minor stability improvements

No changes to your data — everything stays on your device.