Terms of Use

KosClass is an app that helps teachers run their classes (students, groups, points, attendance) and play learning games in class. It is run by Chereuta Kostiantyn (an individual), Da Nang, Vietnam. Contact: support@kosclass.com.

Accounts are for teachers and educators aged 18 or over. If you use KosClass for a centre or school, you confirm you may accept these terms on its behalf. Students do not create accounts; parents may make an account to connect to their child (from 29 November 2026).

• Give true details, one account per person, keep your password secret and tell us at once if someone else uses your account.
• You are responsible for what happens in your account.
• You may ask to close and delete your account at any time via privacy@kosclass.com.

The Free plan can be used without time limit, within the limits shown on the Pricing page. Premium unlocks more for the period shown in your account.

At present Premium is given by KosClass directly (e.g. a trial or a gift) and there is no online payment. When we start selling Premium: the price is shown in Vietnamese dong before you pay; you pay by bank transfer or another lawful method shown at purchase; Premium does not renew automatically and nothing is charged automatically.

Refunds: within 30 days of paying you may cancel Premium for any reason and get back the money for the days not yet used. After 30 days, if Premium does not work as described and we cannot fix it within 7 days of your report, we also refund the unused time. Refunds are paid within 30 days of your request, by the method you paid with (unless you agree otherwise). Send requests to support@kosclass.com. Your rights under the Law on Protection of Consumer Rights are not limited by these terms.

When Premium ends, the account returns to Free; your classes and games are not deleted.

Every teacher has their own invite link (account menu → 🎁 Invite teachers). When a new teacher creates an account through your link and buys Premium for the first time, you both get extra Premium: they buy 1 month → 2 weeks each; 3 months → 1 month each; 12 months → 2 months each. The reward is Premium time, not money; it cannot be exchanged for money or passed to someone else.

Each new teacher counts once. An inviter gets at most 12 free months of Premium in any 365 days. Inviting yourself (for example a second account) does not count: an invite from the same browser, internet address or name as the inviter is checked by KosClass before anything is given, and may be refused. If the payment is refunded, both rewards are taken back. KosClass may change or end the invite program; rewards already given are kept.

Games, questions, pictures and materials you make or upload stay yours. You allow KosClass to store, show and process them to provide the features you use, and — for games you share in the Library — to let other teachers find, play and (if you allow it) copy them.

The teachers’ Library. New games are shared in the Library (“Everyone”) by default, with the name you set in KosClass as the author. Every teacher can play public games. Copying someone else’s game to change it is a Premium feature. With Premium you can choose “Only me” (a private game) or turn on “no copies” (others can play it but not copy it). When you make a game private or delete it, it leaves the Library at once; copies other teachers made before stay with them.

You confirm you have the right to use and share everything you put in (text, pictures, photos of books), that it is suitable for learners, and that it does not break Vietnamese law or anyone’s rights. Never put learners’ personal details (names, photos, phone numbers…) in a game.

Reports and takedown. KosClass does not check games before they are shared. Every game in the Library has a Report button; rights holders can also write to support@kosclass.com (naming their work and the infringing game). We review and hide infringing content within 72 hours of a well-founded notice from a rights holder, and within 24 hours when a competent state authority asks. Accounts that infringe repeatedly may be blocked.

• You can invite other teachers by email to teach one of your classes with you. They join only when they press Accept; an invite ends after 30 days.
• A co-teacher sees that class’s learner names, points, groups and attendance (never your other classes), and can give points, take attendance, play games and add or edit learners. They cannot remove learners, rename or delete the class, or invite anyone else.
• Only invite teachers who really teach that class (for example a teaching assistant, a substitute teacher or the centre’s manager). You decide who may see the class’s learner information and you are responsible for sharing it.
• The class stays yours. You can take a teacher out at any time, and a co-teacher can leave by themselves. Points they gave stay in the class.
• A class can have at most 10 co-teachers; you can send at most 20 invites a day.

• "Create from photo" sends the photo you choose to Google Gemini to make questions. Machine-made results can be wrong — check them before using them with students.
• Do not use photos showing faces, names or personal details of students or anyone else.
• There is a daily limit. The feature is a beta and may change or pause.

For student data, you (or your centre or school) decide why and how it is processed (the data controller). You are responsible for having the consent of a parent or guardian — and, at the same time, of the student themselves if aged 7 or over (Decree 330/2026/ND-CP, Article 60) — before entering students' names, pictures or other details, and for entering only what teaching needs.

The student data you enter is kept in your account on KosClass's server in Vietnam. KosClass processes it for you and undertakes to: process it only on your instructions, to provide the service; keep it confidential; protect it with the measures in the Security section of the Privacy Policy; keep it in Vietnam; use only the providers listed in that policy; help you answer requests from parents and students; tell you about incidents; and delete or return it when you ask or when the account closes. This is the data processing agreement between you and KosClass.

Parents and learners signing in (from 29 November 2026): you give a learner's family code only to that learner's own family; you approve only parents you know are the parent or guardian; you remove a parent when that is no longer true. A parent confirms they are the learner's parent or legal guardian, confirms the child's age truthfully and that the child (aged 7 or over) knows and agrees, and is responsible for letting their child sign in. When a parent asks to delete their child's data, you delete the learner from the class.

Reports to parents (from 28 November 2026): you save a parent's phone number only with their consent; you send a report about a student only to that student's own parent, never to a class group or anyone else; you read each report before sending it (you are responsible for what you send); and you stop sending and delete the number when the parent asks.

• Break Vietnamese law, post content unsuitable for children, insult or harass others, or infringe their rights.
• Break in, scan, overload or damage the system; use robots or automated tools to take data.
• Collect other people's personal data without a lawful basis.
• Resell, rent out or copy KosClass to compete with it.

Your classes are kept in your account and open on any computer you sign in on. Changes are saved automatically while you are online; changes made without a connection are sent when it is back, as long as that browser tab has not been closed. KosClass makes encrypted backups every day, but you should still keep your own backup (Account → My data → Back up) before big changes.

The name, logo, design, software, pictures and games made by KosClass belong to KosClass. You may use them for teaching within these terms, but not copy or redistribute them without written permission.

We work to keep KosClass running well but cannot promise it will never be interrupted or have errors (e.g. during maintenance or a provider's outage). We may change, add or remove features; if a change removes something you paid for, we tell you first and refund the matching part.

As far as Vietnamese law allows, KosClass is not liable for indirect loss (such as lost profit), and KosClass's total liability to you is no more than what you paid KosClass in the 12 months before the event. This does not exclude liability that the law does not allow to be excluded, including consumer rights.

You may stop using KosClass and ask for your account to be deleted at any time. We may suspend or close an account that breaks these terms or the law; except in an emergency or where the law requires, we tell you first and say why. If a paid account is closed through no fault of yours, we refund the unused time.

For important changes we tell you at least 15 days ahead by email or in the app. If you do not agree, you can stop using KosClass and ask for your account to be deleted before the change takes effect.

These terms are governed by Vietnamese law. Both sides first negotiate in good faith; if that fails within 30 days, the dispute goes to the competent People's Court in Vietnam. Consumers keep every choice of dispute resolution the Law on Protection of Consumer Rights gives them. If the Vietnamese and English texts differ, the Vietnamese text applies.

Help and questions about these terms: support@kosclass.com. Personal data: privacy@kosclass.com.