Terms and Conditions

Last updated: November 2026

§1 Scope & provider

These Terms and Conditions (“Terms”) govern the contractual relationship between Centric Software International Ltd. (“provider”, “we”) and the users (“user”, “you”) of the service quartetto., available at quartetto.app and as an app for iOS.

By using the service you accept these Terms. If the app is obtained through a distribution platform (e.g. the Apple App Store), that platform's terms apply in addition; with regard to obtaining the app you are a direct contractual partner of the platform.

Deviating, conflicting or supplementary terms of the user do not become part of the contract unless the provider expressly agrees to them in writing.

§2 Description of service

quartetto. is a Top Trumps style card game against the app or against other players. Every card carries the same categories with different values; whoever's turn it is picks a category from their own top card, the better value wins both cards.

The service also includes:

• matches against the app at three strengths (Easy, Medium, Hard),
• with an account, online duels: "Find opponent" (a random opponent with a similar rating, in Normal or Hardcore mode) and friendly matches against friends,
• coins from matches, daily tasks, the daily bonus calendar and the Season Pass, which buy packs of five cards each, among other things,
• a collection of every card received; duplicate copies can be sold for coins,
• the Season Pass with a free track and a paid track (§4),
• with an account, the Workshop, where you create your own topics, categories and cards and share them with friends (§7),
• coin packs purchasable individually for real money, and optional rewarded ads that pay out coins (§8),
• a PIN lock for the app,
• synchronisation of profile and collection with the server from the Premium tier onward.

Online duels

In online duels the server shuffles, deals and scores. Rated duels change your rating. In Hardcore mode the winner picks one of three random cards from the loser's played deck, and the loser loses one copy of that card. You choose the mode yourself before each search. Friendly matches neither win nor cost a card.

The data on vehicles, animals, buildings and places shown on the cards are real, researched values; where the card photographs come from is listed in the Image credits. The Provider continuously develops the service further. There is no entitlement to the permanent availability of individual features, decks or design elements.

§3 Account & conclusion of contract

No account is required for basic use. Matches can be played and the collection grows as long as it only lives on the device. You need an account for purchases (tiers, coin packs, Season Pass), for online duels, the Workshop and rewarded ads, and for syncing between multiple devices and backup on the server. An account is created by entering an e-mail address and a password (at least 8 characters). After registering, the user receives a confirmation e-mail; the contract is concluded when the link it contains has been successfully confirmed.

The account applies exclusively to quartetto. Other applications of the provider keep separate accounts with their own login details, even if the same e-mail address is used. Signing in to quartetto. does not grant access to any other service of the provider and vice versa; a plan purchased in another app does not apply here.

The user must provide truthful information when registering and keep their login details secret; an account is not transferable. Use is open to consumers and businesses alike. Registration requires the user to be at least 16 years old or to have the consent of a parent or guardian.

§4 Plans, prices & payment

quartetto. is offered in three tiers; a fourth tier (Enterprise) is prepared but not currently available for purchase.

Premium is a one-time payment and remains valid permanently. Premium Plus is a monthly subscription and includes the scope of Premium.

All prices are final prices including the applicable statutory VAT; the prices shown before purchase in the app and in the App Store are authoritative. There is no set-up fee.

Coin packs

Independently of the tiers, coin packs can be purchased individually for real money in case the coins earned in the game are not enough. A coin pack is a consumable: the coins are credited once and can then be spent in the game, for example on packs, single cards or the Workshop. Coin packs are not covered by "Restore Purchases". The coins are kept in the game data on the device and, from the Premium tier onward, also in the backup on the server.

Packs have random contents. The odds per rarity are shown on the pack in the shop before you buy. Coins, cards and other in-game content have no monetary value and cannot be exchanged back for money.

Season Pass

A season usually runs for two months. Its Season Pass has 40 levels with two tracks: the free track is open to everyone, the pass track only with the purchased pass for that season. Season points come from matches, packs, daily tasks and the daily bonus calendar. Rewards are coins, packs, energy vouchers, wish card tokens and a card back of its own; no reward gives an advantage in card values.

The pass is a one-time App Store purchase for exactly one season, not a subscription, and does not carry over to later seasons. When a season ends, the app credits everything reached but not yet claimed, the pass track only with the pass. "Restore Purchases" covers the pass.

Processing of payment

Purchases and subscriptions in the app are processed through the Apple App Store; Apple's terms apply additionally in this respect, and Apple is the contracting party for payment processing. The user enters payment details with Apple; the provider does not receive them. A subscription renews automatically for the chosen period unless cancelled in the App Store account settings at least 24 hours before expiry.

A purchased scope is bound to the App Store account. After a device change, "Restore Purchases" restores it.

§5 Term, termination & withdrawal

Free use runs for an indefinite period. The user can end the contract at any time by deleting their account in the app (§12).

One-time purchases have no term and therefore cannot be cancelled; they remain permanently tied to the purchasing App Store account. A subscription has a term of one month and renews automatically unless cancelled at least 24 hours before expiry. Cancellation is made via the subscription management of the App Store account and takes effect at the end of the current period; the provider itself cannot cancel a subscription. When the subscription ends, the previously purchased or the Basic tier applies again.

Right of withdrawal for digital content

Consumers have a statutory right of withdrawal. This right expires early where the user has expressly agreed to immediate performance of the contract before the withdrawal period elapses and has confirmed that they thereby lose their right of withdrawal, for example through immediate unlocking or crediting after purchase. For App Store purchases, exercising the right of withdrawal follows Apple's terms. Refunds are governed exclusively by Apple's terms.

§6 Obligations of the user

The user undertakes

• to use the service only within applicable law and not to enter or send any unlawful, offensive or third-party-rights-infringing content,
• to keep credentials confidential and not to grant third parties access to the account,
• not to manipulate game state beyond regular gameplay,
• not to take any measures that may impair the operation of the service or its server infrastructure (for example automated bulk requests or reverse engineering beyond what is legally permitted).

In the event of breaches, the provider may restrict access or, after prior warning, suspend the account.

§7 Data, content & storage

The user remains the owner of the content they create (their profile, such as an uploaded photo).

Without an account, collection, match history, coins and settings remain exclusively on the device (IndexedDB). With an account and from the Premium tier onward, profile and collection are transmitted encrypted and stored on the server in a directory assigned to the account, so they are available again on another device or after a reinstall. For online duels and the Workshop, the data they need is stored on the server with an account in every tier.

Your own content in the Workshop

With an account you can create your own topics, categories and cards in the Workshop, with names, values, colours and your own pictures. A new category costs 600 coins, each card 10 coins. You can share your categories only with accepted friends, and only while the friendship lasts. Your own cards can only be played in friendly matches.

You are responsible for your content. It must not break the law or infringe the rights of others, for example in pictures. You grant the Provider the right to store the content and show it to the friends you share it with. Other players can report shared content; the Provider reviews reports and can block a collection. A blocked collection is visible only to its creator.

Details on the processing of personal data are set out in the privacy policy.

§8 Advertising

In the free Basic tier, the iOS app displays an advertising banner delivered via Google AdMob. From the Premium tier onward it is permanently removed.

In any tier you can choose to watch an ad video in the coin shop (a rewarded ad, also via Google AdMob). Only a video watched to the end pays 10 coins. This needs an account and works at most once an hour and five times a day.

The respective advertisers are responsible for the content and legality of the advertisements shown. Which data is processed in this context is described in the Privacy Policy.

§9 Rights of use & intellectual property

All rights in the service itself, in particular software, design, logos and the quartetto. brand, belong to the provider or its licensors. The user is granted a simple, non-transferable and non-sublicensable right to use the service within the scope of these Terms.

The provider acquires no rights in content entered by the user beyond what is technically necessary to operate, display, back up and deliver the service.

The service also includes the card catalogue; the rights to it likewise belong to the provider or its licensors. Rights to the card photographs used belong to their respective authors, see Image credits.

Reverse engineering, removing notices of rights and distributing modified versions are prohibited unless permitted by law.

§10 Availability & changes

The provider endeavours to ensure high availability of the service but cannot guarantee uninterrupted availability. Maintenance work, technical faults or events beyond the provider's control (force majeure, failures of third parties such as hosting or payment providers) may lead to temporary restrictions. No availability commitment in the form of a service level agreement exists.

The provider reserves the right to adapt or extend the range of features in the course of further development, or to discontinue individual features, provided this is reasonable considering the legitimate interests of the user. Substantial restrictions affecting the core of a paid service will, as far as possible, be announced to paying users with reasonable notice. This also applies to individual decks or categories.

§11 Liability

The provider is liable without limitation for intent and gross negligence, under product liability law, for injury to life, body or health, and within the scope of guarantees given.

In the event of slightly negligent breach of a material contractual obligation (cardinal obligation) whose fulfilment makes the proper performance of the contract possible in the first place and on whose observance the user may regularly rely, liability is limited in amount to the foreseeable damage typical for this type of contract. Otherwise liability for slightly negligent breaches of duty is excluded.

The above limitations of liability also apply in favour of the provider's legal representatives and vicarious agents where claims are asserted directly against them.

For loss of data the provider is liable only to the extent that would have arisen had the user carried out proper and regular data backups.

Values shown on the cards

The data on the cards has been carefully researched, but no guarantee is given for its completeness or currency. It serves the game only and is not technical advice or a purchase recommendation. Content that users create in the Workshop is the responsibility of its creator.

§12 Suspension & account deletion

The user can irrevocably delete their account in the app at any time. The account is then deactivated and the associated data on the server is removed. This action cannot be undone; a backup of important content is not possible in the absence of an export function.

Deletion affects the account for quartetto. only. The user's accounts with other applications of the provider remain unaffected and must be deleted there separately.

The provider is entitled to suspend or terminate an account in the event of a serious or repeated breach of these Terms after prior warning with a reasonable deadline. Refunds are governed exclusively by Apple's terms.

§13 Changes to these terms

The provider reserves the right to amend these Terms with effect for the future where this is necessary for legal reasons, because of changes to the service, or to adapt to changed technical or economic conditions, and where this does not unreasonably disadvantage the user. Users will be informed of substantial changes in the application or by e-mail with reasonable notice.

If the user does not object to the amended Terms within six weeks of receiving the notice of change, or continues to use the service after that period, the amended Terms are deemed accepted. The provider will separately point out this consequence and the right to object in the notice of change.

§14 Final provisions

English law applies, excluding the UN Convention on Contracts for the International Sale of Goods. If the user is a consumer, this applies only to the extent that it does not restrict the protection of mandatory consumer protection provisions of their habitual residence.

If the user is a merchant, a legal entity under public law or a special fund under public law, the registered office of the provider in London, England is (as far as legally permissible) the exclusive place of jurisdiction for all disputes arising out of or in connection with this contract.

Should any provision of these Terms be or become invalid, the validity of the remaining provisions remains unaffected. The statutory rule takes the place of the invalid provision.

The European Commission provides a platform for online dispute resolution at ec.europa.eu/consumers/odr. The provider is neither obliged nor willing to take part in dispute resolution proceedings before a consumer arbitration board.

§15 Contact