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Terms of Service

Mester mobile application · Effective 9 September 2026 · Version 1.0

1. Agreement

These Terms govern your use of the Mester app and related services ("Mester") provided by REVANTA S.R.L., Strada Lungă 149, Ap. P3, Brașov 500051, Romania, Trade Register no. J2026022355001, tax ID 54418160 ("Revanta", "we"). By installing or using Mester you agree to these Terms and to our Privacy Policy. If you use Mester on behalf of a business, you confirm you have authority to bind that business.

2. What Mester is

Mester is an appointment book for independent professionals. It lets you record clients and their contact channels, plan bookings, send reminders through the messaging apps installed on your device, reschedule bookings, and — when you sign in — back up and synchronise your data across devices. Mester does not send messages on its own, does not process payments between you and your clients, and does not provide a public booking page.

3. Account

You may use Mester without an account; your data then exists only on your device and we cannot recover it if the device is lost. To back up and sync, you create an account with an email address and a one-time code. You are responsible for keeping access to that email address secure and for everything done through your account.

4. Your data and your clients' data

You own the data you enter into Mester. You grant us a limited licence to store, process and back it up solely to provide the service. You can export all of your records as a file at any time (Settings → Export data). Your clients' personal data is processed under the Data Processing Terms in Section 11, where you are the controller and we are the processor. You are responsible for having a lawful basis to record your clients' data, for keeping it accurate, and for responding to their requests. Do not record special categories of data (such as health information) unless you have the client's explicit consent or another lawful basis.

5. Acceptable use

You agree not to use Mester to send unsolicited messages, to store data you have no right to hold, to attempt to access other users' data, to reverse-engineer the app beyond what the law permits, or to resell the service. We may suspend an account that violates these rules after notifying you, unless immediate action is needed to protect other users.

6. Fees and subscriptions

During private testing Mester is free. When paid plans are introduced, prices and terms will be shown in the app before you buy. Subscriptions purchased through Apple are billed and managed by Apple under its terms; refunds are handled by Apple. We will give at least 30 days' notice before a free feature becomes paid. Data you entered remains accessible for export if your subscription ends.

7. Availability and changes

We aim to keep the sync service available but do not guarantee uninterrupted operation. The app continues to work offline. We may change or discontinue features; if we discontinue the service we will give at least 60 days' notice and a way to export your data.

8. Intellectual property

Mester, its code, design and the Mester name belong to Revanta. These Terms do not transfer any of those rights to you. Feedback you give us may be used to improve the product without obligation to you.

9. Liability

Mester is a scheduling tool; you remain responsible for your bookings and your relationship with your clients. To the extent permitted by law, our total liability for any claim under these Terms is limited to the amount you paid us in the 12 months before the claim, or €50 if you have paid nothing. We are not liable for indirect losses, lost profits, or data lost due to a device you did not back up. Nothing in these Terms limits liability for gross negligence, wilful misconduct, or where the law does not allow limitation. Consumers in the EU keep all rights granted by mandatory consumer law.

10. Termination

You can stop using Mester at any time and delete your account from Settings (Settings → Account → Delete account), which erases your cloud data as described in the Privacy Policy. We may terminate these Terms with 30 days' notice, or immediately for serious breach. Sections 4, 8, 9, 11 and 12 survive termination.

11. Data Processing Terms

This section is the data processing agreement required by GDPR Art. 28 for personal data of your clients that we process on your behalf ("Client Data").

11.1 Roles and subject matter

You are the controller and Revanta is the processor of Client Data. Subject matter: storage, synchronisation and backup of Client Data for the purpose of managing your appointments. Duration: while you have an account. Data subjects: your clients. Categories: identification and contact data (names, phone numbers, messenger identifiers), appointment history, free-text notes and tags you choose to enter.

11.2 Our obligations

  • Process Client Data only on your documented instructions, which are given through your use of the app, unless required by EU or Romanian law.
  • Ensure staff with access are bound by confidentiality.
  • Apply appropriate technical and organisational measures: encryption in transit, per-account access isolation, a firewall with the database not exposed to the internet, access logging, daily backups, EU-only hosting.
  • Assist you, to the extent reasonable, in responding to data subject requests and in meeting your obligations under GDPR Art. 32–36.
  • Notify you without undue delay, and at the latest within 48 hours, after becoming aware of a personal data breach affecting Client Data.
  • Delete Client Data when you delete it in the app or delete your account, within the periods stated in the Privacy Policy, unless EU or Romanian law requires retention.
  • Make available the information necessary to demonstrate compliance, and allow audits by you or an auditor you mandate, at reasonable intervals and with reasonable notice, at your cost.

11.3 Sub-processors

You authorise the sub-processors listed in the Privacy Policy (currently Hetzner Online GmbH for hosting and Zoho Corporation B.V. for transactional email). We will notify you by email at least 14 days before adding or replacing a sub-processor; if you object on reasonable grounds you may terminate your account and export your data.

11.4 International transfers

Client Data is stored in the EU. Any transfer outside the EEA will be made only under an adequacy decision or appropriate safeguards under GDPR Chapter V.

11.5 Your obligations

You are responsible for the lawfulness of collecting Client Data, for informing your clients as required by GDPR Art. 13, and for not entering data you are not permitted to process.

12. Governing law and disputes

These Terms are governed by Romanian law. Disputes will be brought before the competent courts of Brașov, Romania, without prejudice to mandatory consumer protection rules that let you sue in your home jurisdiction. EU consumers may also use the European Commission's online dispute resolution platform.

13. Contact

REVANTA S.R.L. · Strada Lungă 149, Ap. P3, Brașov 500051, Romania · developer@dev-revanta.com