1. Introduction
This Privacy Policy ("Policy") informs you about your choices and our practices regarding your personal data ("Information"). In this Policy, "Persie0", "we", "us", or "our" refers to Marvin Perzi, an individual developer based in Austria, operating under the brand name "Persie0".
This Policy applies to all iOS and Android mobile applications published by Persie0 (collectively the "Apps"), as well as all associated services, websites, or features that we may offer. By downloading, accessing, and/or using our Apps, you acknowledge that you have read and understood this Policy and agree to the collection, processing, use, and storage of your Information as described herein.
If you do not agree with this Policy, you must not use any of our Apps. If you change your mind in the future, you must stop using the Apps and can exercise your rights regarding your Information as set out in this Policy.
We are always striving to improve the information we provide to our users. If you have feedback on this Privacy Policy, please let us know via the contact details in Section 22.
2. Data Controller
Within the meaning of applicable data protection laws (including, but not limited to, the General Data Protection Regulation 2016/679 — the "GDPR" — and the Austrian Data Protection Act ("DSG")), the controller for your personal data is:
We decide why and how your Information is used and are therefore considered a "controller" under the GDPR and equivalent legislation. For certain third-party services integrated into our Apps (e.g., Appodeal for advertising), the third-party providers may act as independent controllers for the data they collect. Please consult their respective privacy policies for further details.
3. Information We Collect
We collect various types of information to provide and improve our Apps. The data we collect depends on the context of your interactions with us, your choices (including your privacy settings), and the features you use. Most data we collect comes directly from you or your device when you use our Apps.
3.1 Automatically Collected Information
When you install, access, or use our Apps, we may automatically collect or generate the following information about you and your device:
| Data Category | Specific Data Points | Purpose |
|---|---|---|
| Precise Location Data (GPS) | Latitude, longitude, altitude, speed, bearing, and accuracy from GPS, Wi-Fi, and cellular signals | To provide core location-based app functions; processed in real-time and/or stored locally on the device, depending on the App |
| Device Identifiers | Google Advertising ID (GAID), Apple Identifier for Advertisers (IDFA), Android ID, unique internally assigned Persie0 user ID | To provide and measure personalized advertising; to distinguish users for analytics and fraud prevention |
| IP Address | Your Internet Protocol (IP) address at the time of connection to our services or third-party SDKs | General geographic location inference, security monitoring, fraud prevention, and ad targeting |
| Device Information | Manufacturer, model, brand, screen resolution, OS name and version, language settings, time zone, network status (Wi-Fi/cellular), available storage, battery status | To ensure app compatibility, performance optimization, troubleshooting, and analytics segmentation |
| App Usage Data | Install/uninstall timestamps, session start/end, duration, feature usage, app version, interaction events, screen views | To analyze app usage, optimize features, improve user experience, and measure engagement |
| Diagnostic/Crash Data | Stack traces, error messages, exception types, device state at crash, OS version, app version, breadcrumbs (event sequence before error) | To identify, diagnose, and fix bugs and performance issues (collected via Sentry) |
| On-Device Camera Stream / Scanning | Real-time camera feed processed locally on your device (e.g., for resistor detection) | To provide core app functionality (Resistor Scanner); scanning occurs exclusively on the device, and no images or videos are sent to our servers unless you explicitly opt-in or manually share an image |
3.2 Information from Third Parties
We may receive information about you from third-party services integrated into our Apps, including:
- Advertising Partners (Appodeal and its demand partners): Advertising ID, information about your interactions with ads shown in our Apps (impressions, clicks, conversions), and inferred interest segments for ad personalization.
- App Store / Platform Providers (Google Play, Apple App Store): Transaction data for in-app purchases, including transaction ID, item purchased, currency, value, and timestamp.
- Analytics Providers: Aggregated or pseudonymized usage reports that help us understand user behavior and optimize features.
3.3 Information Provided Directly by You
We may collect information that you provide directly to us, including:
- Support and Feedback: When you contact us (e.g., via email), we collect your email address, name (if provided), and any other information you provide in your correspondence. We use this data solely to respond to your inquiry.
- User-Contributed Images (Optional): In certain apps (such as Resistor Scanner), you can explicitly choose to share images of recognized resistors with us or manually select an image from your gallery to send to us. We use these images to improve our recognition models and app accuracy.
3.4 Third-Party API Keys (Optional)
Some of our apps may require (for optional parts of the app) you to provide your own API keys from third-party providers (e.g., OpenWeatherMap, Google Gemini, or NVIDIA) to unlock specific features. If you decide to use these features:
- The API keys are stored locally on your device or only used for the duration of the session, depending on the App.
- Communication using these keys occurs directly between your device and the third-party service provider.
- We do not receive or collect any data from these third-party providers. Your interaction is exclusively between you and the respective third-party service.
4. Use of Your Information
We use the collected information for the following purposes:
4.1 Providing and Maintaining Our Apps
We use your Information to provide the core functionality of our Apps, including processing GPS data for location-based features, maintaining your settings, and ensuring technical compatibility with your device.
4.2 Improving and Optimizing Our Apps
It is in our legitimate interest to improve our Apps for our users. We analyze usage patterns, feature engagement, session data, and performance metrics to identify areas for improvement, develop new features, and optimize existing functionalities. We may also use anonymized and aggregated data for product development and research.
4.3 Personalized Advertising
Our Apps are advertising-funded. Subject to your consent (where required by law), we serve personalized advertising through our advertising partner Appodeal. This involves sharing certain device identifiers (GAID/IDFA), IP address, and usage data with Appodeal and its demand partners so they can show you interest-relevant ads and measure ad performance. You can object to personalized advertising at any time — see Section 6 for details.
4.4 Diagnostics, Stability, and Troubleshooting
We use Sentry to collect crash reports and diagnostic data in real-time. This helps us quickly identify, investigate, and fix bugs, crashes, and performance issues, ensuring a stable and reliable experience for all users.
4.5 Security and Fraud Prevention
We process information such as IP addresses and device identifiers to detect, prevent, and address fraud, unauthorized access, and other illegal or harmful activities that may affect our Apps or users.
4.6 Legal Compliance
We may process your Information as necessary to comply with applicable laws, regulations, legal processes, or enforceable governmental requests; enforce our terms of use and other agreements; protect our rights, property, or safety, or the rights, property, or safety of our users or the public.
4.7 Communication
If you contact us, we use the information you provide to respond to your questions, inquiries, or complaints. We do not use your email address for marketing or unsolicited communication.
5. Legal Bases (GDPR)
If you are located in the European Economic Area (EEA), the United Kingdom (UK), or Switzerland, we rely on the following legal bases under the GDPR to process your personal data:
Where you have given us your explicit consent for a specific purpose. This applies especially to: (i) the delivery of personalized advertising based on your Advertising ID and usage data (via Appodeal); (ii) the collection and processing of precise GPS location data for location-based features. Consent for Appodeal is managed through an integrated Consent Management Platform (CMP). You have the right to withdraw your consent at any time.
Where processing is necessary for our legitimate interests, provided these are not overridden by your interests or fundamental rights. Our legitimate interests include: (i) operating and growing our business; (ii) ensuring app stability and performance (via Sentry, applying data minimization/IP masking); (iii) security and fraud prevention; (iv) conducting analytics to understand usage. You have the right to object — see Section 14.
Where processing is necessary to comply with a legal obligation to which we are subject, such as responding to valid legal requests from courts or authorities or retaining records as required by tax or commercial law.
Where processing is necessary for the performance of a contract to which you are a party. This applies to providing the core functionalities of our Apps and processing in-app subscriptions and purchases (via RevenueCat).
6. Advertising
Our Apps are free to download and use. To support development and maintenance, our Apps display advertisements served by our advertising partner Appodeal.
6.1 How Advertising Works in Our Apps
When you use our Apps, non-personal identifiers such as the Google Advertising ID (GAID) on Android and/or the Identifier for Advertisers (IDFA) on iOS, along with other device and usage data, may be collected and shared with Appodeal and its network of demand partners (including, but not limited to, AdMob, Meta Audience Network, Unity Ads, ironSource, and others integrated via the Appodeal mediation platform).
6.2 Personalized vs. Non-Personalized Ads
With your consent (where required), Appodeal and its partners may use the collected data to create a profile of your preferences based on your activity and show you ads tailored to your interests ("personalized ads"). If you do not provide consent or withdraw it, you will still see ads in our Apps, but these will be non-personalized (i.e., not based on your behavioral profile or interests).
6.3 How to Opt Out of Personalized Advertising
You can opt out of personalized advertising at any time by adjusting your device settings:
- Android: Settings → Privacy → Ads → "Delete advertising ID" or "Opt out of Ad Personalization."
- iOS: Settings → Privacy & Security → Tracking → disable "Allow Apps to Request to Track", or Settings → Privacy & Security → Apple Advertising → disable "Personalized Ads."
You can also reset your Advertising ID in the settings mentioned above. Please note that opting out does not reduce the number of ads but only their relevance to you.
6.4 Appodeal Privacy Policy
Appodeal acts as an independent controller for the personal data it collects via its SDK integrated into our Apps. For detailed information on how Appodeal collects, uses, processes, and shares your data, please read the Appodeal Privacy Policy.
7. Third-Party Services
We rely on trusted third-party service providers to support us in operating and improving our Apps. These third parties may collect information used to identify you. Each third-party provider operates under its own privacy policy.
Provider: Appodeal Inc., 1640 Boro Place, 4th Floor, McLean, VA 22102, USA.
Appodeal provides advertising mediation services connecting our Apps to ad networks. Displaying personalized ads (or accessing the device) requires your active consent under Art. 6(1)(a) GDPR and local equivalents. This is collected via a Google-certified Consent Management Platform (CMP) that strictly implements the TCF v2.3 protocol to cryptographically exclude non-compliant "Ghost Vendors". We provide granular privacy settings (e.g., via a "Pay-or-Okay" model) and do not force users into an all-or-nothing consent before runtime trackers become active. Data collected includes device identifiers (GAID/IDFA), IP address, and usage data. Data transfer to the USA is secured via Standard Contractual Clauses (SCCs).
Privacy Policy: https://www.appodeal.com/home/privacy-policy/
Provider: Functional Software, Inc., 45 Fremont Street, 8th Floor, San Francisco, CA 94105, USA.
To actively monitor technical processes and system stability, we use the error analysis service Sentry, acting as our Data Processor. If an application crashes or an error occurs, diagnostic data is sent to help us resolve the issue. The legal basis for this is our legitimate interest (Art. 6(1)(f) GDPR) in the smooth functioning of our software. For strict data minimization, we use mandatory "Data Scrubbing": sensitive user data (especially IP addresses) is automatically filtered out and masked before it ever reaches the servers.
EU Data Residency: Sentry provides an EU residency option. Your data is processed and stored on Sentry servers within the European Union (Frankfurt am Main, Germany) to ensure the highest data protection standards.
Data Transfer to the USA: To the extent that data is processed in the USA, we rely on two key mechanisms for secure transfer:
- EU-U.S. Data Privacy Framework (DPF): Sentry is an active participant in this framework, which has been approved by the European Commission for secure data transfers.
- Standard Contractual Clauses (SCC): Additionally, the company uses Standard Contractual Clauses approved by the EU Commission, in which Sentry bindingly commits to maintaining the strict EU level of data security.
You can view Sentry’s Data Processing Addendum (DPA), including the SCCs, at https://sentry.io/legal/dpa/. Further details can be found in Sentry’s Privacy Policy.
RevenueCat helps us manage in-app subscriptions, purchase validation, and track aggregated business analytics such as total customer metrics and monthly recurring revenue (MRR) (legal basis: contract fulfillment and legitimate interest according to Art. 6(1)(b) and (f) GDPR). Pseudonymized purchase histories are tracked. RevenueCat acts strictly as our data processor. Data transfers to the USA are legally secured, as RevenueCat is certified under the current EU-U.S. Data Privacy Framework (DPF) and also applies Standard Contractual Clauses (SCCs).
Provider: Google Ireland Limited, Gordon House, Barrow Street, Dublin 4, Ireland.
We use Google Drive for the internal management of business data and feedback, and as an optional service for you to backup and synchronize your application data (Cloud Sync) across devices (Legal basis: contract fulfillment and legitimate interest under Art. 6(1)(b) and (f) GDPR). Depending on the server location, data may be transferred to the USA. Google is certified under the EU-U.S. Data Privacy Framework (DPF) and uses Standard Contractual Clauses (SCCs).
Privacy Policy: https://policies.google.com/privacy
Provider: Google Ireland Limited, Gordon House, Barrow Street, Dublin 4, Ireland.
Firebase Authentication allows secure login and user account management (Legal basis: Art. 6(1)(b) or (f) GDPR). Data transfer to the USA is secured via the EU-U.S. Data Privacy Framework (DPF) and Standard Contractual Clauses (SCCs).
Privacy Policy: https://firebase.google.com/support/privacy
Provider: Google Ireland Limited, Gordon House, Barrow Street, Dublin 4, Ireland.
Allows login using your Google account. We only receive basic data like name and email address. You can revoke access in your Google account security settings (Legal basis: Art. 6(1)(a) or (f) GDPR). Secured via DPF and SCCs.
Privacy Policy: https://policies.google.com/privacy
Provider: Apple Inc., One Apple Park Way, Cupertino, CA 95014, USA.
Allows login using your Apple ID. We receive basic data such as name and (optionally) your email address. Transfer to the USA is secured via Standard Contractual Clauses (SCCs).
Privacy Policy: https://www.apple.com/legal/privacy/
Our Apps are distributed through Google Play (Google LLC) and the Apple App Store (Apple Inc.). These platforms process transaction data according to their own terms.
10. International Data Transfers
We are based in Austria. However, the third-party services we use (like Appodeal, Sentry, and RevenueCat) are headquartered in the United States and other countries outside the EEA/UK. This means your Information may be transferred to, stored, and processed in a country that may not provide the same level of data protection as your home country.
Where we transfer personal data outside the EEA, we ensure that appropriate safeguards are in place, such as:
- Adequacy Decisions: Transfers to countries recognized by the European Commission as providing an adequate level of data protection.
- Data Privacy Framework (DPF): Using the EU-U.S. Data Privacy Framework for certified American providers.
- Standard Contractual Clauses (SCCs): Using standard data protection clauses approved by the European Commission.
11. Data Retention
We retain your Information for as long as necessary to fulfill the purposes for which it was collected, as described in this Policy, or as required by law (e.g., for tax or accounting purposes). When the processing purpose no longer exists or the retention period expires, data is either deleted or anonymized.
11.1 In-App Account Deletion & Platform Requirements (Apple / Google)
In compliance with Apple's strict guidelines, we provide a direct, in-app function to delete your account for any App that offers account creation. When you trigger this deletion, we do not merely delete your profile on our end; we also instruct our data processors (specifically RevenueCat and Sentry) to permanently erase all associated user data.
Furthermore, the statements made in this Privacy Policy mirror precisely the information provided in the "Data Safety" form on the Google Play Console. This ensures complete transparency regarding data storage for analytics and advertising, thereby preventing any risk of App suspension.
12. Entire Agreement
This Privacy Policy constitutes the entire agreement between you and Persie0 regarding the processing of your personal data. Any previous agreements or understandings are superseded by this Policy.
13. Data Security
We take the security of your Information seriously and implement appropriate technical and organizational measures to protect it from unauthorized access, loss, or misuse. However, no method of transmission over the Internet or mobile networks is 100% secure, and we cannot guarantee absolute security.
14. Your Rights (GDPR)
If you are in the EEA or UK, you have the following rights regarding your personal data:
You have the right to request a copy of the personal data we hold about you and information about how we process it.
You have the right to request that we correct any inaccurate or incomplete personal data.
You have the right to request the deletion of your personal data under certain conditions.
You have the right to request that we restrict the processing of your personal data.
You have the right to receive your personal data in a structured, commonly used, and machine-readable format.
You have the right to object to processing based on our legitimate interests or for direct marketing.
Where we rely on your consent, you have the right to withdraw it at any time.
To exercise your rights, please contact us at persie0@protonmail.com. You also have the right to lodge a complaint with a data protection authority (see Section 22).
15. California Privacy Rights (CCPA/CPRA)
If you are a California resident, you have additional rights under the California Consumer Privacy Act. We do not "sell" or "share" your personal information for money. However, the use of Advertising IDs for personalized advertising may be considered a "sharing" under California law. You can opt out as described in Section 6.3.
16. Children's Privacy
Our Apps are not directed to children under the age of 13 (or higher in some jurisdictions). We do not knowingly collect personal Information from children. If we become aware that we have collected personal data from a child without valid parental consent, we will take steps to delete that information as quickly as possible.
17. Webhosting and Server Logfiles
Our websites are hosted on GitHub Pages. When you visit our website, server log files are automatically generated, which may include your IP address, browser type, operating system, and the pages visited. GitHub processes this data to ensure the security and reliability of the service. GitHub is a service of GitHub, Inc., 88 Colin P. Kelly Jr. Street, San Francisco, CA 94107, USA.
Data transfer to the USA is secured via Standard Contractual Clauses (SCCs). For more information, please see the GitHub Privacy Statement.
18. Data Processing Agreement (DPA)
We have entered into Data Processing Agreements (DPAs) or accepted the Data Processing Terms with our service providers (e.g., Google, Amazon, RevenueCat, Sentry) to ensure they process your data exclusively according to our instructions and in compliance with the GDPR. In the case of American providers, these are usually supplemented by Standard Contractual Clauses (SCCs).
19. Communication
If you send us an inquiry via email or contact form, the data you provide (e.g., email address, name, message content) will be processed to handle and respond to your inquiry (Legal basis: Art. 6(1)(b) or (f) GDPR). Your inquiry will be deleted as soon as it is no longer needed (e.g., after the final clarification of the issue) and no legal retention obligations exist.
20. Definitions
- Personal Data: Any information relating to an identified or identifiable natural person.
- Processing: Any operation performed on personal data, such as collection, storage, adaptation, or disclosure.
- Controller: The natural or legal person who determines the purposes and means of the processing of personal data.
- Processor: A natural or legal person who processes personal data on behalf of the controller.
21. Changes to this Policy
We may update this Privacy Policy from time to time to reflect changes in our practices or for other operational, legal, or regulatory reasons. We will notify you of any material changes by posting the new Policy in the Apps or on our website. You are advised to review this Policy periodically for any changes. Changes to this Policy are effective when they are posted on this page.
22. Contact & Complaints
If you have any questions or concerns about this Policy or our data practices, please contact us:
If you are located in the EEA, you also have the right to lodge a complaint with your local data protection authority. In Austria, this is the:
Österreichische Datenschutzbehörde
Barichgasse 40-42, 1030 Vienna, Austria
Email: dsb@dsb.gv.at
Website: www.dsb.gv.at