Last Updated: September 23, 2026
These Terms of Use ("Terms") govern your use of the LessonOS mobile application for Android and iOS (the "App"), provided by Chumphon Jan Toolseram ("we", "our", or "us"). By downloading or using the App, you agree to these Terms. If you do not agree, do not use the App.
Our Privacy Policy explains how the App handles information and forms part of these Terms.
LessonOS helps trainers, coaches and small studios manage students, classes, check-ins, attendance, leave requests and credit packages. The App works offline and does not require an account.
The App is free to use with limits (currently up to 15 students, 3 classes and 1 credit package template). LessonOS Pro removes these limits and unlocks additional features such as full analytics, backup and restore, CSV import and full export, kiosk mode and make-up credits.
You can get Pro in one of three ways:
Prices are shown in the App and on the App Store or Google Play before you buy, in your local currency, and may include taxes that apply where you live. Features included in Pro may change as the App is updated.
Subscriptions renew automatically until you cancel. Payment is charged to your Apple ID or Google Play account when you confirm the purchase (or when your free trial ends). Your subscription renews and you are charged for the next period unless you turn off auto-renewal at least 24 hours before the end of the current period.
All payments are processed by Apple or Google. We never see or store your payment details. Refunds are handled by the store you paid through, under its policies:
Except where the store or applicable law requires otherwise, payments are non-refundable and we do not provide refunds or credits for partial subscription periods.
On either platform, you may not copy, modify, reverse engineer, resell or redistribute the App, or use it for anything unlawful.
You own the data you enter. If you record information about other people (for example, students or their parents), you are responsible for having the right to do so and for complying with privacy laws that apply to you.
The App is provided "as is" and "as available". To the fullest extent permitted by law, we make no warranties that the App will be error-free, uninterrupted, or that data will never be lost. Please keep regular backups.
To the fullest extent permitted by law, we are not liable for any indirect, incidental, special or consequential damages, or for any loss of data, revenue or business, arising from your use of or inability to use the App. Our total liability for any claim relating to the App is limited to the amount you paid for the App or Pro in the 12 months before the claim. Nothing in these Terms limits rights you have under consumer protection laws that cannot be excluded.
If you downloaded the App from the Apple App Store, the Apple EULA (see section 8) applies in addition to these Terms. Apple is not responsible for the App or its content, and Apple has no obligation to provide maintenance or support for it.
If you downloaded the App from Google Play, your use of the App and any purchases are also subject to the Google Play Terms of Service. Google is not a party to these Terms and is not responsible for the App.
We may update the App, change or discontinue features, and update these Terms from time to time. We will post the updated Terms on this page and change the "Last Updated" date. Continuing to use the App after changes take effect means you accept the updated Terms.
These Terms are governed by the laws of Malaysia, without regard to conflict-of-law rules. This does not take away any mandatory consumer protections of the country where you live.
Questions, complaints or claims about the App or these Terms can be sent to: