COVID Radar: A comprehensive guide to the official app to prevent infections and protect your privacy

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Radar COVID has become an essential tool within the digital strategy for preventing infections. Available free of charge to all users from the Google Play Store and App Store, this official application has been designed to help prevent the spread of the virus by notifying users of potential contacts with positive cases. It stands out for its completely anonymous and secure operation , and for having the endorsement of the Spanish Government's State Secretariat for Digitalization and Artificial Intelligence.

The app is designed to alert potential risk contacts privately and voluntarily, without collecting personal identifying data or tracking users' locations. Its value lies in enhancing the rapid detection of close contacts, especially in the days following an exposure, when prevention is vital. Participation by regions and citizens is increasing, directly impacting the system's usefulness and potential to help stop the chain of infection.

What is Radar COVID and what is its purpose?

Radar COVID is the official Spanish app for preventing the spread of COVID-19. It is managed and overseen by the State Secretariat for Digitalization and Artificial Intelligence and is specifically designed to notify users of potential exposure to the virus. It uses advanced technology based on the exchange of anonymous identifiers via Bluetooth Low Energy , avoiding the use of GPS, storage of personal data, or user location tracking.

The main objective of Radar COVID is to anonymously and quickly alert anyone who has been in close contact with a person diagnosed with COVID-19, allowing for swift action in accordance with health recommendations. The application covers the entire country and works on both Android and iOS devices.

• Freely available in official Android and iOS stores.
• Works with Bluetooth Low Energy to minimize battery consumption.
• Does not collect personal information, guaranteeing total anonymity and privacy.

Radar COVID has been developed under the strictest technical privacy standards and is supported by the European Commission's recommendations to ensure adequate protection of each user's data. Its use, and the reporting of positive cases, is entirely voluntary and based on citizen cooperation.

Privacy guaranteed: 100% security and anonymity

One of Radar COVID's key features is its absolute commitment to user privacy . Unlike other apps that require registration, phone number, email, or name, Radar COVID never requests any personal data . It also doesn't use GPS signals or store location-related information, ensuring that users' movements are not tracked.

The app only exchanges random codes between devices via Bluetooth, which change periodically to avoid any link to a specific identity. All operations that enable communication between terminals and contact detection are performed exclusively on the phone , without transferring identifiable information to external servers.

This architecture ensures that:

• No user can be identified or located.
• Exposure notices are anonymous and private.
• There is no persistent record or association between identities and terminals.
• Sharing a positive diagnosis is optional and does not reveal the user's identity.

The system has been endorsed as one of the most robust in terms of data protection and privacy, following the decentralized model recommended at the European level. Both the use of Radar COVID and the reporting of a positive infection are voluntary and anonymous, thus ensuring cybersecurity and the right to privacy at every stage of app use.

Additionally, the main telephone operators have committed to not passing on the data consumption derived from the use of Radar COVID to their users, which eliminates any access barrier based on mobile data consumption.

How Radar COVID Works: How it Detects Contacts and Issues Alerts

Radar COVID's internal workings are based on Bluetooth Low Energy (BLE) technology. Devices with the app installed and Bluetooth enabled exchange random codes with each other, which change regularly. This process allows for:

• Each mobile phone with COVID Radar emits and observes anonymous identifiers of other nearby devices.
• A contact is only recorded if both people have been within 2 meters of each other for at least 15 minutes.

The identifiers are stored locally on the device, without access by third parties or central servers. If a user tests positive after a PCR test through the healthcare system, they can choose to voluntarily report their positive result via the app by entering an anonymous code provided by the healthcare professional or the regional health system. This initiates the anonymous alert process for other users.

1. When the user enters the positive code, your mobile phone uploads to a central server only the anonymous identifiers generated by your phone in the last few days.
2. The app periodically downloads the list of positive IDs from other users and compares them locally with their recent contact log.
3. If there is a match (i.e. they have been close for a sufficient time and distance), the app emits a exposure alert, indicating a risk of possible contagion.

Each user who receives a notification gets clear instructions on the steps to follow according to the health protocols of the corresponding autonomous community, including information on contacting health centers or the procedure for carrying out diagnostic tests.

Installation, requirements, and first steps with Radar COVID

Installing and configuring Radar COVID is a simple and intuitive process, with no requirements that would be a barrier for most users.

• Free download: Available on the Google Play Store and App Store, ensuring compatibility with most modern devices.
• Bluetooth On: It's essential to keep Bluetooth turned on for the app to work properly. Radar COVID uses the BLE standard to minimize battery consumption.
• No account, registration or personal data required.
• It does not access the user's GPS or location..

On Android devices, due to technical reasons related to the operating system, GPS location must be enabled for Bluetooth Low Energy functionality to be activated for contact tracing applications. This does not mean that Radar COVID accesses or records the user's location; it is a limitation imposed by the Android system to protect privacy across all apps.

The registration process, both on Android and iOS, is summarized in three basic steps:

• Download and install the app from the official store.
• Accept Bluetooth permissions and (on Android) enable location.
• Keep the app active to receive notifications in case of contact with positive cases.

In the event of a positive diagnosis, the user chooses, voluntarily , whether to report the infection by entering the one-time code provided by the health system.

Reporting positive cases and managing alerts from Radar COVID

Voluntary reporting of a positive diagnosis is one of the cornerstones of Radar COVID, ensuring that the system operates efficiently, quickly, and without compromising privacy. The procedure for reporting a positive result includes:

• Users who test positive after a PCR test receive a single-use code through the healthcare system.
• This code is entered into the app to report the infection anonymously.
• The system sends alerts to all users who have been in direct contact (within 2 meters and for more than 15 minutes) during the incubation period, typically the last 7-14 days.

The instructions accompanying each alert vary by region, but typically include:

• Information on the risks of exposure to the virus.
• Steps to follow, such as preventive isolation or requesting a PCR test.
• Direct contact phone numbers for health services to receive personalized advice and care.

Since there is no identification involved in the communication, neither the user reporting the positive result nor their exposed contacts can be identified through the app. Furthermore, in many regions, it is possible to access the positive test code through integrated healthcare system applications, thus avoiding unnecessary travel.

Advantages, technical limitations, and challenges of implementing Radar COVID

The potential value of Radar COVID increases with the number of users who have it installed and use the application responsibly and consistently. The greater its penetration among the population, the greater the app's capacity to detect chains of transmission and provide early warnings before positive cases generate new contacts.

However, there are certain technical limitations and challenges associated with the mass adoption of Radar COVID, including:

• Dependence on Bluetooth and GPSOn older or low-end devices, battery consumption can be a problem if the user must constantly keep these services active. On Android, the app requires location services to be enabled due to system limitations, although it doesn't access or store that information.
• Custom layers from manufacturersSome brands, especially those running custom operating systems, may close background apps to optimize power, which could hinder Radar COVID's continuous operation. It's recommended that you check your settings to allow Radar COVID to run continuously in the background.
• Unsupported devices: Some brands and models, especially those affected by commercial bans or restrictions on access to Google services (such as some Huawei products), may experience limitations in the installation or correct functioning of the app.
• It requires collective awarenessTo achieve true effectiveness, it is estimated that at least 25% of the population must have the app active and using it at all times. Institutional support, awareness campaigns, and the commitment of the autonomous communities are key to achieving this goal.

Despite its limitations, indicators show that Radar COVID is a reliable and effective tool when used widely. Interoperability is another challenge under development: the European Commission is working on a common infrastructure that will allow Radar COVID and similar applications from other countries to be compatible and enable cross-alerts for travelers or temporarily displaced persons.

Recommendations and complementary measures to Radar COVID

Although Radar COVID is a key ally for prevention , it does not replace general health recommendations or physical protection measures. Even when protected by the app, health authorities emphasize the importance of continuing to comply with:

• Correct use of masks in public and closed spaces.
• Frequent hand washing with soap and water or hydroalcoholic solution.
• keep interpersonal safety distance at least 1,5-2 meters.
• Regular ventilation of closed spaces.
• Avoid crowded spaces, mass gatherings, and unnecessary social events.

COVID Radar is a digital and collaborative tool for prevention, but responsible behavior, honest communication, and a public willingness to prevent the spread remain central to controlling any community-transmitted virus.

Additionally, if you receive an exposure alert through the app at any time, immediately contact the health services indicated in your autonomous community and follow the instructions provided. The system is integrated with most regional health services to ensure an efficient response.

Participation of the autonomous communities and geographical coverage

Healthcare in Spain operates in a decentralized manner, meaning that reporting positive cases and alerts depend on the integration between Radar COVID and the regional health systems. Although it is already implemented and active in most regions, reporting positive cases and coordination with the regional health system may vary slightly from one area to another.

• Users residing in communities with the system implemented They can report positives and receive alerts from people anywhere in the country.
• In areas where the system is not fully implemented, alerts may be received, but a positive case cannot be reported until the system is activated in the corresponding community.
• Interoperability, currently under development at the European level, will allow the app to also work on international trips.

In each autonomous community, there are specific channels for obtaining a positive test code and communicating with regional health services. In some, there is integration with digital applications belonging to the health system, such as Salud Informa, to more efficiently manage obtaining the code and responding to an exposure notification.

In the event of receiving an alert, in autonomous communities with full integration, it is recommended:

• Contact the official telephone number of the autonomous community.
• Follow the instructions for isolation and diagnostic testing.
• Inform the health system if you have symptoms or belong to a risk group.

COVID Radar is, therefore, a tool with national coverage and in the process of expanding its international interoperability, maximizing its reach and usefulness in situations of risk or resurgence.