Terms of Use RentReducer

• Version: 2026-05-17
• Effective from: launch of the app on the Apple App Store / Google Play Store
• Applies to: RentReducer iOS + Android app (Bundle ID com.mietsenkung.mietsenkung)

1. Provider and contracting party

Provider and contracting party for the use of the RentReducer app is the responsible person listed in the legal notice.

Contact: kontakt@mietsenkung-app.ch Website: https://mietsenkung-app.ch

2. Scope

These Terms of Use apply to the use of the RentReducer mobile application in all languages and platforms (iOS, Android). By installing and using the app, you accept these terms.

3. Description of services

RentReducer is a software tool that supports tenants in Switzerland in calculating and enforcing rent reductions following a decline in the mortgage reference interest rate. The app:

• calculates, based on your input (rent, adjustment date), a non-binding reduction claim under Art. 270a CO and Art. 13 OBLF;
• generates formal letters (reduction request, reminder, request for supporting documents, conciliation announcement) as PDF and Word;
• offers a paid postal dispatch service via a third-party provider (Pingen GmbH, Zurich);
• stores user data exclusively locally on the device (encrypted SQLite database).

4. No legal advice

RentReducer is not a replacement for a lawyer and does not provide legal advice. The information, calculations, letter templates, and FAQ in the app serve exclusively as general information. For a binding legal assessment of your individual case, please contact:

• the tenants’ association of your canton (mieterverband.ch);
• the cantonal conciliation authority for tenancy matters;
• a lawyer specialised in tenancy law.

5. Protection against termination under Art. 271a CO (important)

You acknowledge that Swiss tenancy law protects you as a tenant against so-called retaliatory terminations:

• Art. 271a para. 1 lit. a CO: a termination given because you assert a right arising from the tenancy (e.g., reduction request) is voidable.
• Art. 271a para. 1 lit. e CO: for three years from the conclusion of a conciliation or court procedure, your landlord cannot terminate the lease in the ordinary way.
• Art. 273 CO: you have 30 days from receipt of a termination to challenge it before the conciliation authority.

RentReducer is not liable for any reactions by your landlord to a reduction request created via the app. You are well protected legally; in case of dispute, the conciliation authority and tenants’ association are responsible (see section 4).

6. Limitation of liability

To the extent permitted by law (Art. 100 CO), the liability of RentReducer is limited to intent and gross negligence. RentReducer is in particular not liable for:

• the outcome of your reduction procedure or a conciliation/court procedure;
• missed rent reductions due to incorrect input or outdated data in the app;
• consequential costs from your landlord’s reactions (terminations, refusal of repairs, etc.);
• failure or delay of the postal dispatch service by Pingen GmbH or Swiss Post;
• data loss due to device change, app reinstallation, or loss of the encryption key stored in the Keychain/Keystore (the app is local-first, no cloud backup, see FAQ).

This limitation does not apply to personal injury or other liability claims that cannot be excluded under mandatory Swiss law.

7. Prices, purchases and refund

In-app purchases (letter dispatch, registered add-on, follow-up letters) are processed via the App Store (Apple) or Google Play (Android). The respective terms of these platforms apply.

Letters are digital services delivered immediately: after tapping “Send”, the letter goes to the printing service and is physically produced. A withdrawal after sending is not possible. If you have paid but not yet sent: you can request a refund within 14 days directly via your App Store (see FAQ entry).

Current price list in the app under Settings > Prices and on the website under “Pricing”.

8. Sub-processors

RentReducer uses the following sub-processors for letter generation and dispatch:

• Pingen GmbH (Badenerstrasse 47, 8004 Zurich, CHE-115.571.921 VAT): physical printing and dispatch of letters via Swiss Post (data processing agreement signed 2026-04-21).
• Firebase Inc. (Google Cloud, europe-west6 Zurich): backend endpoints for reference data, push notifications, and App Check.
• RevenueCat Inc. (USA): handling of in-app purchase transactions.
• Sentry GmbH (Vienna): crash reporting with PII scrubber.

Details and data flow in the privacy policy (/privacy-en.html).

9. Availability, maintenance, updates

The app and backend services are operated with industry-standard care. RentReducer does not guarantee uninterrupted availability, in particular not the availability of Pingen, Swiss Post, Firebase or other third parties.

App updates may contain new features, bug fixes, or legal adjustments. You are notified of available updates via the App Store / Play Store.

10. Changes to these Terms

RentReducer may modify these Terms at any time. Material changes are communicated in the app and on the website. By continuing to use the app after a change, you accept the modified Terms.

11. Final provisions

• Applicable law: Swiss law, excluding conflict-of-laws rules.
• Place of jurisdiction: to the extent permitted by law, Weggis/Lucerne is the exclusive place of jurisdiction. Mandatory consumer jurisdictions at the user’s domicile remain reserved.
• Severability clause: if a provision of these Terms is invalid, the validity of the remaining provisions remains unaffected.

12. Contact

For questions on these Terms or the app: kontakt@mietsenkung-app.ch