It works completely offline and seamlessly without interstitial ads. The Melatone app contains no unnecessary ads. Users can adjust sound levels to their liking. They can create sound mixes as they wish. They can activate their desired sound for half an hour with rewarded ads. It doesn't save any data; everything is stored on your device and can be deleted at any time. There is no user login; only AdMob ad data related to AdMob is saved.