Effective Date: April 23, 2026
Last Updated: April 23, 2026
The data controller responsible for your personal data under Article 4(7) of the GDPR is:
The application does not require registration or any personal data input. All currency conversion calculations are performed locally on your device using a Bitcoin price fetched from a public price endpoint. The amounts you enter and the currency pairs you select are never sent to any server. Through third-party services, the following data may be automatically collected:
| Category | Types of Data | Purpose |
|---|---|---|
| Device Information | Device type and model, OS version, unique device identifiers (Advertising ID, App Instance ID), language, time zone | App functionality, analytics, advertising |
| Usage Data | App interactions, screens viewed, session duration, features used, in-app events (such as currency switches or swaps, with no amount values) | Analytics, app improvement |
| Network Information | IP address (for approximate geolocation), network type, carrier | Geolocation for ads, analytics |
| Crash Data | Crash reports, stack traces, device state at time of crash | Bug fixes, app stability |
| Advertising Data | Ad interactions, impressions, clicks, advertising identifiers | Personalized/non-personalized ads |
| Price-Feed Queries | The currency ticker for which a price is requested (e.g. "USD", "EUR") sent to the price and chart data providers; IP address of the request | Fetching the current Bitcoin price and 24-hour price history |
We process your personal data for the following purposes:
Processing of your personal data is based on the following legal grounds under Article 6(1) of the GDPR:
| Processing Activity | Legal Basis | Reference |
|---|---|---|
| Personalized advertising | Consent | Art. 6(1)(a) GDPR |
| Non-personalized advertising | Legitimate interest | Art. 6(1)(f) GDPR |
| Analytics (Firebase Analytics) | Consent | Art. 6(1)(a) GDPR |
| Crash reporting (Crashlytics) | Consent | Art. 6(1)(a) GDPR |
| Price-feed queries (btcapi.cz, CoinGecko) | Legitimate interest | Art. 6(1)(f) GDPR |
| Basic app functionality | Legitimate interest | Art. 6(1)(f) GDPR |
Under Art. 7(3) GDPR, withdrawal of consent must be as easy as giving it.
The application uses the following third-party services that may collect and process your data:
Advertising service for displaying App Open and Native advertisements within the application.
Analytics service for understanding app usage. Only active when consent is given.
Crash reporting service for collecting app crash reports. Only active when consent is given.
Configuration service for remotely adjusting app behavior (ad frequency, price-refresh interval, feature kill-switches).
Public Bitcoin price endpoint used to fetch the current BTC-to-fiat exchange rate.
Public cryptocurrency data API used to fetch the 24-hour Bitcoin price history shown as a mini chart on the home screen.
Google acts as a joint controller or processor depending on the specific processing activity. More information can be found in Google's Data Processing Terms.
The application displays two ad formats: a full-screen App Open ad that may appear when you launch the app or return to it after leaving it in the background, and a Native advertisement embedded on the home screen. Both formats are subject to frequency limits (by default no more than three App Open ads per day with at least a 20-minute interval between them; the native ad refreshes at most once every 60 seconds).
The type of ads you see depends on your consent:
You can manage your advertising preferences through:
The application and its third-party services use SDKs, local storage (Android DataStore), and similar technologies to:
In compliance with the ePrivacy Directive (2002/58/EC), we obtain your consent before using cookies and similar technologies that are not strictly necessary for the application to function.
We share your data with Google (as described in Sections 5.1–5.4) for the purposes of advertising, analytics, crash reporting, and remote configuration. Price-feed queries are shared with btcapi.cz (Section 5.5) and CoinGecko (Section 5.6) solely to obtain public market data.
Your data may be transferred to and processed in countries outside the European Economic Area (EEA), including the United States (Google servers) and Singapore (CoinGecko).
When transferring data outside the EEA, we rely on appropriate safeguards:
Transfers are carried out in accordance with Chapter V of the GDPR (Articles 44-49).
We retain your data for the period necessary to fulfill the purposes described in this policy:
| Data Type | Retention Period |
|---|---|
| Analytics data | 26 months (Google Analytics default) |
| Crash reports | 90 days |
| Advertising data | Per Google's policies |
| Consent choices | Until consent is withdrawn or the app is uninstalled |
| Cached price & 24h history (on-device only) | Overwritten on each successful price refresh; fully erased when the app is uninstalled |
You may request deletion of your data at any time (see Section 10).
As a data subject, you have the following rights under the GDPR:
| Right | Description | Reference |
|---|---|---|
| Right of Access | Obtain confirmation of processing and a copy of your personal data | Art. 15 GDPR |
| Right to Rectification | Request correction of inaccurate personal data | Art. 16 GDPR |
| Right to Erasure | Request deletion of your personal data ("right to be forgotten") | Art. 17 GDPR |
| Right to Restriction | Request restriction of how we use your data | Art. 18 GDPR |
| Right to Data Portability | Receive your data in a structured, machine-readable format | Art. 20 GDPR |
| Right to Object | Object to processing based on legitimate interest. For direct marketing (advertising), you have an absolute right to object at any time. | Art. 21 GDPR |
| Right to Withdraw Consent | Withdraw consent at any time without affecting the lawfulness of prior processing | Art. 7(3) GDPR |
| Right to Lodge a Complaint | Lodge a complaint with a supervisory authority | Art. 77 GDPR |
You can exercise your rights:
We will respond to your request without undue delay, and no later than one month from receipt.
If you are a California resident, you have additional rights under the California Consumer Privacy Act (CCPA) as amended by the California Privacy Rights Act (CPRA):
To exercise your California privacy rights, contact us at 0ndr4N@proton.me. We will verify your identity before processing your request.
The application is not directed at children under 13 years of age. We do not knowingly collect personal data from children under 13 (or 16 in certain jurisdictions).
If you believe that we have collected data from a child below the applicable age threshold, please contact us at 0ndr4N@proton.me and we will promptly delete such data.
We implement appropriate technical and organizational measures to protect your personal data against unauthorized access, alteration, disclosure, or destruction. These measures include:
However, no method of transmission over the internet or electronic storage is 100% secure. While we strive to protect your personal data, we cannot guarantee absolute security.
Security measures are implemented in accordance with Art. 32 GDPR.
We may update this Privacy Policy from time to time. When making changes:
We recommend reviewing this policy periodically for any changes.
If you have any questions, concerns, or requests regarding this Privacy Policy or our data processing practices, please contact us:
We will respond to all legitimate requests within the statutory period (one month under GDPR; 45 days under CCPA).
BTC Converter | Application ID: com.ondran.btcconverter
This Privacy Policy is effective as of April 23, 2026
Processing in compliance with:
Regulation (EU) 2016/679 (GDPR) | California Consumer Privacy Act (CCPA/CPRA)
© 2026 BTC Converter. All rights reserved.