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Privacy Policy – ChordButter for iOS and macOS

Last updated: 2026-01-16

1. Overview

This Privacy Policy explains how ChordButter for iOS and macOS (the “Application”) processes personal data (“Personal Data”) when you use the Application.

Some data processing is required to provide the Application.
Other processing is optional and takes place only if you explicitly consent within the Application.

This Privacy Policy is intended to be valid worldwide. Where local data protection laws apply (including the GDPR in the EU/EEA/UK and applicable US state privacy laws), additional rights may apply as described below.


2. Owner and Data Controller

Christian Hengst | Design & Code
Elsaßstraße 1
Atelier H/M/R
50677 Cologne, Germany
Email: buero@christianhengst.de


3. Categories of Personal Data

Depending on your use of the Application and your settings, the following categories of data may be processed:

  • Usage Data (e.g. feature interactions, app events, approximate location such as country or city)
  • Device and technical data (e.g. device model, operating system, app version)
  • Crash and diagnostic data (technical error reports)
  • Purchase and subscription metadata
  • Email address (only in specific contexts, such as TestFlight or optional advertising services)

4. Purposes of Processing

Personal Data is processed for the following purposes:

  • Providing and maintaining core app functionality
  • Subscription and in-app purchase validation
  • App stability, security, and troubleshooting
  • Synchronization of user content across devices
  • Beta testing (if TestFlight is used)
  • Analytics and advertising (only with your explicit consent)
  • Fraud and abuse prevention related to subscriptions (only with your explicit consent)

5. Services Used by the Application

Required Services (necessary for the operation of the Application)

These services are essential to provide the Application and cannot be disabled.

Apple In-App Purchases

All payments and subscriptions are processed exclusively by Apple.
The Application and its Owner do not have access to payment credentials such as credit card numbers or bank details. Apple processes payment data as an independent data controller under its own privacy policy.


Adapty (subscriptions, purchases, receipt validation)

Adapty is used to manage subscriptions and in-app purchases, validate receipts, and determine access to paid features.

Adapty may process:

  • Device and app information (e.g. device model, operating system, app version)
  • App or device identifiers (excluding IP addresses)
  • Purchase and subscription metadata
  • App interaction events related to paywalls and purchase flows

IP address collection is disabled.
No payment information is accessible to the Application or to Adapty.


Sentry (crash reporting and stability monitoring)

Sentry is used to detect crashes and technical errors in order to improve reliability and performance.

Sentry may process:

  • Crash and error reports (e.g. stack traces, error messages)
  • Device information (e.g. device model, operating system version)
  • App information (e.g. app version, build number)

IP address collection is disabled. No intentional collection of personally identifiable information (such as names, email addresses, or payment data) takes place.


iCloud (Apple – data synchronization)

The Application uses iCloud to synchronize user data (such as settings or projects) across devices associated with the same Apple ID.

Data is processed exclusively by Apple under its own privacy policy.


Optional Services (only with your explicit consent)

These services are disabled by default and are activated only if you give explicit consent within the Application. Consent can be withdrawn at any time in the Application under "Settings > Data Usage & Privacy".

App Tracking Transparency (ATT)

On iOS and iPadOS, if you consent to optional tracking, Apple’s App Tracking Transparency (ATT) prompt is shown after the in-app consent dialog.

Tracking identifiers (such as IDFA) are accessed only if ATT permission is granted.


Firebase SDK (Google Analytics) (analytics)

If you consent, the Application uses Firebase SDK (Google Analytics) to analyze usage patterns and improve features and performance.

Firebase may process:

  • App interaction events
  • Device and app information
  • Approximate location (country or city)
  • Pseudonymous identifiers

Legal basis: Consent (Art. 6(1)(a) GDPR)

See the “Optional Services” section above for information on consent and withdrawal.


Meta / Facebook SDK (advertising, analytics, remarketing)

If you consent, Meta services may be used for:

  • Advertising
  • Analytics
  • Remarketing (e.g. Custom Audiences, Lookalike Audiences)

Depending on configuration and consent, Meta may process:

  • Usage and interaction data
  • Advertising identifiers (e.g. IDFA)
  • Approximate location data
  • Network-related data (such as IP address)

See the “Optional Services” section above for information on consent and withdrawal.


Subscription Protection

If you explicitly consent, the Application may enable a subscription protection feature provided via Adapty.

This feature is used solely to prevent abusive or fraudulent refund requests related to subscriptions. For this purpose, limited usage and subscription-related data may be shared with Apple via Adapty.

The data processed may include:

  • Subscription status and purchase metadata
  • Limited usage signals related to subscription activity

No advertising, profiling, or cross-app tracking is performed as part of this feature.

See the “Optional Services” section above for information on consent and withdrawal.


6. Trackers and Interest-Based Advertising Controls

If you have given consent for optional advertising or analytics services, you may also manage preferences through:

  • Device-level privacy and advertising settings
  • Industry opt-out mechanisms (e.g. YourOnlineChoices, Digital Advertising Alliance)

7. External Services and Links

User Guide

The ChordButter user guide is available at: https://guide.chordbutter.com/

The guide is operated independently. Please refer to the provider’s privacy policy for information on their data processing practices.


8. Legal Bases for Processing

Where required by applicable law, Personal Data is processed on one or more of the following bases:

  • Performance of a contract (providing the Application)
  • Consent (optional analytics and advertising services)
  • Legal obligations
  • Legitimate interests (security, stability, and service improvement)

9. Data Retention

Personal Data is retained only for as long as necessary to fulfill the purposes described in this Privacy Policy, unless a longer retention period is required by law or based on your consent.


10. International Data Transfers

Some service providers may process data outside your country of residence.

Where required, appropriate safeguards (such as Standard Contractual Clauses) are used.


11. Children’s Privacy

The Application is not intended for children below the age rating specified in the Apple App Store.
The Owner does not knowingly collect Personal Data from children below that age.


12. Your Rights

Depending on your location, you may have the right to:

  • Access your Personal Data
  • Request correction or deletion
  • Restrict or object to processing
  • Withdraw consent at any time
  • Receive a copy of your data in a portable format
  • Lodge a complaint with a data protection authority

Requests can be submitted using the contact details in Section 2.


13. Changes to this Privacy Policy

This Privacy Policy may be updated from time to time.
The date of the last update is shown at the top of this document.

If changes affect processing based on consent, new consent will be requested where required by law.

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