App/Website: Hello World
Developer: Md Kawsar Alam
Email: dokan.kawsar@gmail.com
Last updated: September 13, 2026
Depending on how you use Hello World, we may process information that you voluntarily provide, including:
Audio and video calling uses your device microphone and, for video calls, camera only after you grant permission and choose to start or answer a call. The live audio/video stream is exchanged between the call participants using WebRTC. The application uses Firebase Firestore for call signaling information such as call offers, answers and connection candidates. The audio/video stream itself is not intentionally stored by Hello World. You can deny or revoke camera/microphone permissions through your device settings; calling features may not work without the required permission.
Hello World allows users to publish opinions, comments and chat messages. Information that you choose to publish may be visible to other users. Please do not post passwords, payment-card information, government identification numbers, private addresses, phone numbers or other sensitive personal information in public areas.
Hello World uses Firebase services to store, synchronize and provide application data. For example, opinions, comments, reactions and other online features may use Firebase. Information processed through Firebase is subject to the applicable Google/Firebase terms and privacy practices.
The Android application uses a WebView to provide access to the Hello World website. Limited technical information may be processed by the website, hosting, Firebase, advertising or other supporting services to operate, secure, measure and improve the service.
Hello World may display advertisements through third-party advertising services. Advertising providers may collect or use certain information, such as device identifiers, IP address, approximate location, app or website activity, or other technical information, as permitted by applicable law and their services, to provide, measure and personalize advertisements.
Advertising providers have their own privacy policies and terms. Users should review the applicable advertising provider's privacy policy for more information about how advertising data is processed.
Hello World may use browser cookies, local storage or similar technologies to remember settings such as language, theme and certain interaction preferences, and to support the operation of the website.
We may share or allow access to information with service providers that help operate Hello World, such as hosting, database, analytics, security and advertising providers. Public content submitted by users may also be visible to other users by design. We do not sell users' personal information as a standalone product.
We take reasonable measures to protect information used by Hello World. Connections to supported online services may use HTTPS and other security measures. However, no internet service can guarantee absolute security.
Information and public content may be retained for as long as reasonably necessary to provide, maintain, secure and improve the service. If you want your submitted personal information or public content reviewed or removed, contact us at dokan.kawsar@gmail.com. We may request enough information to identify the relevant content and verify the request.
Hello World does not knowingly request sensitive personal information from children. Parents or guardians who believe that a child has submitted personal information that should be removed may contact us using the email address below.
Hello World may use third-party services for hosting, database, advertising, analytics, security and other technical functions. The service may also contain links to external websites. We are not responsible for the privacy practices of third-party websites or services that we do not operate.
You can choose what information to publish in public areas of Hello World. You may also contact us to request review or removal of information that you submitted, subject to applicable law and legitimate operational, security or legal requirements.
We may update this Privacy Policy when our features, services or data practices change. Any updated version will be published on this page with a revised "Last updated" date.
For privacy questions, data requests or concerns, please contact:
Md Kawsar Alam
Email: dokan.kawsar@gmail.com
Thank you for using Hello World.