Terms of Service

Effective date: November 4, 2026 · Previous version: February 1, 2026

These Terms govern your use of the Tandem mobile app, website and related services (the "Service"), provided by Bruno Petković, an independent developer in Croatia ("Tandem", "we", "us"); postal address on request. Contact: support@tandem-app.eu. By creating an account or using the Service you agree to these Terms. Our Privacy Policy explains how we handle personal data. If you download Tandem from the Apple App Store, Apple's Standard End User License Agreement also applies; where it conflicts with these Terms, the more consumer-favourable rule applies to you.

1. Who can use Tandem

You must be at least 18 years old and able to enter into a binding contract. You use Tandem as a consumer for personal, non-commercial purposes.

2. Your account

Keep your login details safe and tell us without delay if you think your account has been misused.
You can delete your account at any time in Settings → Delete account or via our support page.
Tandem is designed for two people who share it with each other's agreement. Pair only with someone who wants to be paired with you. You can end the pairing at any time by deleting your account; if you need help, contact us.

3. The Service

Tandem lets couples share to-dos, calendars, expenses and planning tools. We may improve, change or retire features; if a change materially reduces what a paying subscriber gets during a paid period, we will tell you in advance and you may cancel and receive a pro-rata refund for the unused period of that change, in addition to your statutory rights.

Not financial, legal or relationship advice. Balances, splits and insights in Tandem are calculations from what you enter. Check important amounts yourself. Tandem is not a bank, payment service or debt-collection tool and does not move money.

4. Free plan, Premium and trials

Free plan: core features are free. Some features (for example recurring events and expenses, device calendar sync, custom categories, full expense history and more than two lists) require Tandem Premium.
One subscription for two: a Premium subscription bought by one partner unlocks Premium for both partners while they are paired. Premium belongs to the account that pays; if the pairing ends (for example because the paying partner deletes their account), the other partner loses access to Premium unless they have their own subscription or offer.
Plans and price: monthly and yearly auto-renewing subscriptions. The price, billing period and any trial are shown in the app before you confirm the purchase in your app store, in your local currency, including VAT where applicable.
Free trial: eligible new subscribers get a 14-day free trial (unless a different period is shown before purchase). If you do not cancel at least 24 hours before the trial ends, the subscription starts and the price shown is charged. One trial per account / store account.
Automatic renewal: subscriptions renew automatically for the same period at the then-current price unless cancelled at least 24 hours before the end of the current period. Payment is charged to your Apple ID or Google account at confirmation of purchase (or at the end of the trial).
How to cancel: in your device settings — iPhone: Settings → [your name] → Subscriptions; Android: Google Play → Payments & subscriptions → Subscriptions. Deleting the app or your Tandem account does not cancel a store subscription. After cancellation you keep Premium until the end of the paid period.
Price changes: we will announce price increases in advance through the app store, which asks for your consent where the law or store rules require it. You can cancel before the new price applies.
Founding Couples offer: couples who created their Tandem couple before 4 November 2026, 00:00 CET ("Founding Couples") receive 30 days of Premium free of charge for both partners (no payment details needed, no automatic charge at the end) and may, until the date shown in the app, buy the first year of the yearly plan at a discounted introductory price; after the first year it renews at the regular yearly price unless cancelled. The offer is personal, not transferable and not combinable with other trials for the same account.
Payments and refunds are processed by Apple or Google under their terms. Refund requests go to the store (reportaproblem.apple.com or Google Play). This does not limit your statutory rights below.

5. Your right of withdrawal (EU/EEA consumers)

As a consumer in the EU/EEA you may withdraw from a paid subscription within 14 days of the contract being concluded, without giving a reason. To withdraw, use the store's refund process linked above or tell us clearly by email to support@tandem-app.eu (for example: "I withdraw from my Tandem Premium subscription", with the email of your account); we confirm receipt without delay. If you asked us to start Premium during the withdrawal period, you may have to pay a proportionate amount for the days you already used. A free trial converting into a paid subscription starts a new contract period for this purpose where the law provides so.

6. Your content

You keep all rights to what you add. You give us a non-exclusive, worldwide, royalty-free licence to store, copy, process and display your content only as needed to run the Service for you and your partner (for example syncing, backups, notifications). This licence ends when the content is deleted, except for backup copies that expire on their own schedule.
We do not use your content to advertise, and we do not sell it. We do not use your private content to train AI models.
You are responsible for content you add and must have the right to add it.

7. Acceptable use

Do not: use Tandem unlawfully or to harass, stalk, threaten or control another person; pair with or monitor someone without their agreement; access accounts or data that are not yours; upload malware or illegal content; scrape, overload, reverse-engineer (except where the law allows it) or interfere with the Service; resell or misuse Premium or offers.

If you see misuse, write to support@tandem-app.eu.

8. Suspension and termination

You can stop using Tandem and delete your account at any time. We may suspend or close an account if there is a serious or repeated breach of these Terms, a legal obligation, or a risk to other users or the Service. Except in urgent cases we will tell you the reason first and give you a chance to respond. If we close a paid account without cause in these Terms, we refund the unused part of the paid period. If we decide to discontinue the Service, we will give at least 30 days' notice and a way to export your data.

9. Our responsibility

Legal guarantee: as a consumer you have statutory rights if the Service does not conform to the contract (EU Directive 2019/770 and national law). Nothing in these Terms limits those rights.
We aim for Tandem to be available and reliable but cannot guarantee uninterrupted, error-free operation, particularly when caused by app stores, your device, network or third-party outages. Keep your own copy of anything critical.
We are fully liable for damage caused intentionally or by gross negligence, for injury to life, body or health, and where liability cannot be limited by law.
For slight negligence we are liable only for breach of essential contractual obligations and limited to damage that was typical and foreseeable when the contract was concluded. Otherwise, and to the extent permitted by law, we are not liable for indirect or consequential loss.

10. Intellectual property

The Tandem app, name, logo, design and software belong to us or our licensors. We give you a personal, non-exclusive, non-transferable licence to use the app on devices you own or control, in line with these Terms and the store rules.

11. Changes to these Terms

We may change these Terms for valid reasons (new features, legal or store requirements, security). We will inform you of material changes in the app or by email at least 30 days before they apply. If you do not agree, you can cancel and delete your account before they apply; changes do not affect a subscription period you already paid for to your disadvantage.

12. Law and disputes

These Terms are governed by Croatian law. If you are a consumer, you also keep the protection of mandatory consumer law of the country where you live, and you may bring a claim in the courts of your country or of Croatia. Please contact us first — most issues can be fixed quickly by email. We are not obliged and not willing to take part in dispute resolution before a consumer arbitration body.

13. General

If a provision is invalid, the rest remains in force. You may not transfer your rights under these Terms without our consent; we may transfer the Service to another provider who continues it under these Terms, and will tell you in advance.