Kettra

Contents

1. 1. Provider and scope
2. 2. What the App does
3. 3. Contracting party for purchases: Apple as seller
4. 4. Prices, subscriptions and renewal
5. 5. Cancelling a subscription
6. 6. Right of withdrawal
7. 7. Licence
8. 8. The user's obligations
9. 9. Availability
10. 10. General notice, no professional advice
11. 11. Liability
12. 12. Data protection
13. 13. Changes to these terms
14. 14. Relationship to Apple's terms
15. 15. Final provisions

Terms of Use

Last updated: 6 September 2026

*This is an English translation provided for convenience. The German version at https://mk-sd.com/kettra/terms is the authoritative text; in case of any discrepancy, the German version prevails.*

1. Provider and scope

The provider of the iOS app "Kettra: Habit Tracker" (the "App") is

Maximilian Kuchlbauer
Flurstr. 1
84524 Neuötting
Germany
Email: maximilian.kuchlbauer@gmail.com

These terms govern use of the App between the provider and the user, in the version available at the time the contract is concluded. Conflicting terms put forward by the user do not apply.

2. What the App does

The App lets you create and track habits you choose yourself. In particular it allows creating habits with their own schedule (daily, chosen weekdays, or a chosen number of times per week), ticking off completed days, seeing the current and longest chain, a week grid, and, where switched on, local reminders and a home screen widget for ticking a habit off without opening the App.

The free tier lets you keep up to three habits at once. The paid "Kettra Pro" unlock removes that limit to an unlimited number of habits. The widget and your own history and chain records are always free, regardless of any subscription.

The App stores all data locally on the user's device, in a storage area also used by the widget extension. There is no user account with the provider and no registration is required.

The App's functionality is that of the published version at any given time. The provider continues to develop the App and may change, add to or discontinue individual features, as long as the App's core contractual benefit, creating and tracking one's own habits, is preserved.

3. Contracting party for purchases: Apple as seller

The App and the paid "Kettra Pro" unlock are distributed exclusively through the Apple App Store. The purchase contract for the App and for every in-app purchase is concluded between the user and Apple. Apple is the seller and contracting party (merchant of record) in this respect.

The provider receives neither payment nor banking data from Apple, only aggregated sales statements. Apple's terms therefore additionally apply to the purchase, billing, refunds and subscription management.

4. Prices, subscriptions and renewal

"Kettra Pro" is offered as a subscription with two selectable terms, monthly and yearly, each with a free trial week. Current prices, billing periods and the scope of the trial week are shown in the App before purchase. The prices shown in the App Store at the time of purchase apply, including statutory VAT.

Subscriptions renew automatically for the period booked unless they are cancelled at least 24 hours before the end of the current period. Charges are made through the user's Apple Account.

5. Cancelling a subscription

Subscriptions are managed and cancelled through the user's Apple Account. Cancellation is possible at any time, without giving reasons, effective at the end of the current billing period.

How to cancel:

1. In the App: Settings, then "Manage subscription" (shown only while a subscription exists). This link opens the system subscription management directly.
2. Alternatively on the device: Settings, tap your own name at the top, then "Subscriptions".

This gives the user a directly reachable, permanently available electronic cancellation route for the whole term of the contract, without entering additional credentials and without having to contact the provider. Because the subscription contract is with Apple, the electronic cancellation route required by law is provided and operated by Apple; the App links to it directly and without intermediate steps.

After cancellation, the purchased access remains usable until the end of the period already paid for. There is no pro-rata refund for the unused remainder of a current period, unless mandatory law provides otherwise.

6. Right of withdrawal

Consumers have a statutory right of withdrawal. Because the purchase contract is concluded with Apple, the right of withdrawal is exercised against Apple, in particular through https://reportaproblem.apple.com. Details are in the separate withdrawal policy, available at https://mk-sd.com/kettra/withdrawal.

7. Licence

The user receives a simple, non-transferable, non-sublicensable right to use the App on the devices assigned to them, for their own private purposes. Resale, rental and use on behalf of third parties are not permitted.

Decompiling, reverse engineering or modifying the App is also not permitted, except where expressly allowed by law, and neither are attempts to circumvent the paid unlock.

All rights in the App, its source code, its design, its texts and its name remain with the provider.

8. The user's obligations

The user is responsible for the data they enter. Because the data is stored exclusively on the device, backing it up is also the user's responsibility. The App provides an export function for this purpose (Settings, Export), which produces a CSV file of habits and daily entries; that file is a snapshot, not a running backup. In the event of loss, defect, reset or uninstallation without a prior backup of your own (export or device backup), the data cannot be recovered.

9. Availability

The App is provided as a locally running application and needs no server connection from the provider for its core functions. The widget and reminders depend on Apple's corresponding system services (WidgetKit, Notifications). No particular availability of the App Store, of those system services or of future updates is owed. The provider may discontinue development and support of the App; unlocks already purchased remain unaffected within the technical possibilities of the respective device.

10. General notice, no professional advice

The App is a general tool for self-organisation and for tracking habits the user chooses. It is not a medical device, gives no medical, nutritional, psychological or other professional recommendation, and does not replace corresponding advice. If the user tracks habits with a health dimension (such as fluid intake, exercise, sleep, or abstaining from a substance) with the App, that is done at the user's own responsibility; the App provides no assessment, diagnosis or recommendation about it, only a reflection of what the user entered themselves.

11. Liability

The provider is liable without limitation

• for intent and gross negligence,
• for injury to life, body or health,
• for fraudulent concealment of a defect or the assumption of a guarantee,
• under the provisions of the German Product Liability Act.

In cases of simple negligence, the provider is liable only for breach of a material contractual obligation, that is, an obligation whose fulfilment makes proper performance of the contract possible in the first place and on whose observance the user may regularly rely. In that case liability is limited to the foreseeable damage typical for this type of contract.

Otherwise the provider's liability is excluded. This applies in particular to loss of data, lost profit, indirect damage, and damage caused by improper use, by the user's failure to back up data, or by causes outside the provider's sphere of responsibility, such as disruptions of the App Store, of Apple's system services or of the device itself.

For loss of data, the provider is furthermore liable only to the extent that the damage would also have occurred had the user backed up data properly and regularly.

The above limitations of liability also apply for the benefit of the provider's legal representatives and vicarious agents.

None of the above changes the burden of proof to the user's detriment.

12. Data protection

Details of the processing of personal data are in the privacy policy, available at https://mk-sd.com/kettra/privacy.

13. Changes to these terms

The provider may change these terms where this is necessary to adapt to a changed legal situation, to changed supreme court case law, to technical further development of the App or to changed App Store requirements, and where the user is not unreasonably disadvantaged as a result.

The user will be informed in the App about material changes. If the user does not object to a material change within six weeks of being informed, or continues to use the App after that, the change is deemed accepted. The significance of silence will be pointed out separately in that information. If the user does not agree with a change, they may cancel a running subscription effective at the end of the current period.

14. Relationship to Apple's terms

Distribution takes place exclusively through the App Store. In addition to these terms, Apple's terms therefore apply, in particular the Apple Media Services Terms and Conditions and the Standard End User Licence Agreement (https://www.apple.com/legal/internet-services/itunes/dev/stdeula/). Where these terms and Apple's terms conflict, Apple's terms prevail for the purchase, billing, refunds and subscription management.

The following applies additionally to use of the App:

• This agreement is concluded solely between the user and the provider, not between the user and Apple. Apple is not responsible for the App or its content.
• The provider alone is responsible for maintenance and support of the App. Apple has no obligation to furnish maintenance or support services.
• If the App fails to conform to any applicable warranty, the user may notify Apple, and Apple may refund the purchase price. To the maximum extent permitted by law, Apple has no other warranty obligation. Claims arising from defects of the App are otherwise directed against the provider.
• The provider, not Apple, is responsible for claims of the user or of third parties relating to the App, for example under product liability, for failure to conform to legal requirements, or for infringement of intellectual property rights.
• The user represents that they are not located in a country subject to a United States embargo or designated as a terrorist-supporting country, and that they are not listed on any relevant list of prohibited or restricted parties.
• The user must comply with applicable third-party terms when using the App, for example the terms of their mobile network contract.
• Apple and Apple's subsidiaries are third-party beneficiaries of this agreement. Upon the user's acceptance of these terms, Apple has the right to enforce this agreement against the user as a third-party beneficiary.
• Questions, complaints and claims regarding the App are to be directed to the provider named in section 1.

15. Final provisions

German law applies, excluding the UN Convention on Contracts for the International Sale of Goods. Mandatory consumer protection provisions of the country in which the user has their habitual residence remain unaffected.

Should any provision of these terms be or become invalid, the validity of the remaining provisions is unaffected.

The provider is neither obliged nor willing to participate in dispute resolution proceedings before a consumer arbitration board.