For the web version, you don't need an account unless you are using credits, which are tied to accounts. On the mobile app, you can use the app entirely as a Guest; authentication is only required if you want to save your projects to your library for long-term access or sync them to the cloud.

You can import affirmation files in MP3, WAV, OGG, and M4A formats. The app currently supports exporting your finished projects as high-quality WAV files.

For the web version, the files are temporarily stored on the server for processing of the output but are deleted within 7 days. On the mobile app, all audio files and projects are stored locally on your device's internal storage; cloud storage is an optional Pro feature that you must explicitly enable if you wish to back up your library.

Stacking is a dedicated playback feature that lets you select up to 5 different tracks from your library to play simultaneously. This allows you to combine multiple finished subliminals into one powerful listening session.

In your settings, this is referred to as Focus Fade. When enabled, the app will automatically lower the volume of other background apps (like music, podcasts, or white noise) whenever your affirmations are playing, ensuring they stay at the forefront of your focus.

Instead of a traditional credit system, the app uses Rewarded Unlocks. You can unlock premium features—such as AI-generated voices or specific audio presets—for a project by watching 2 short ads. This gives you full access to premium tools without a subscription.

Focus Fade creates a smooth 'ducking' effect. It dims the audio of other apps while Subtopia is active and gradually restores their volume once you stop your session, preventing jarring audio transitions.

You can create Active Goals with specific daily targets (e.g., 'Listen for 30 minutes'). The app tracks your Total Listening Time, Streaks, and Consistency %. You can also enable custom notifications to remind you to stick to your scheduled session times.