Android and desktop
Open the service in a current browser. When an installation option is available, use the browser's Install App or Add to Home Screen control and follow the confirmation shown on the device.
An installed web app remains connected to the online service. Installation does not itself add a subscription or increase the account's allowance.
iPhone and iPad
Open the website in Safari, use Share and choose Add to Home Screen if that option is available. Give the shortcut a recognizable name and launch it from the home screen.
Use your existing account when you sign in. There is no need to create a separate account just because you added a shortcut on another device.
APK files and store listings
Check the source and publisher before installing a file or choosing a store listing. A similar name or logo is not enough to identify the same service. Follow installation links provided by the service rather than a search result advertising an unlocked version.
A modified APK cannot legitimately grant a server-side subscription. Do not enter your account credentials into an unofficial build or disable device security to install it.
Questions and answers
Do I have to download an app to use GirlfriendGPT?
No. The service is accessible through a browser. A supported home-screen installation offers an app-style way to open the same online service.
Is the web app an offline chatbot?
An installed web app still connects to the online service. Installing it or adding a shortcut is not the same as downloading the model and your account services onto the device.
Where should I look for an Android APK or an iOS app?
Start with the installation options linked by the service and check the publisher. Availability can differ by platform; do not assume a similarly named app-store result is the same product.