What are some alternatives?
When comparing Sleep Time - Alarm Clock and Gentle Wakeup, you can also consider the following products
Sleep Cycle Alarm Clock - Bio-alarm clock that wakes you up at optimal times based on your sleep patterns.
Sleep as Android - Common alarm clocks ignore your sleep cycles, they wake you on schedule no matter your are currently in your deep sleep. Waking up from deep sleep is unpleasant, it makes you tired and it may negatively affect your productivity during the whole day.
Free Alarm Clock - Free Alarm Clock is a free, full-featured and user-friendly computer alarm clock for Windows.
Pillow for iOS - An iOS companion that helps you sleep better 💤
Alarmy - World's most annoying alarm app
SleepBot - SleepBot is a sleep tracking app available in Google Play and the Apple App Store.