This app is the epitome of what a free version should look like. It functions perfectly fine and has all the advertised features available in the free version- calculator, alarm, sleep sounds- but if you’d want more sounds for alarms or white noise, there is the paid option. Love that you can make it super customized. Not everyone falls asleep at the same rate, and you can change that so it can calculate a more accurate bedtime. If you’re trying to maintain a better sleep schedule, this app is a must have.

I usually never write reviews for apps, but this app is just so amazing that I felt obligated to. It’s a super simple interface, and it has all the information you need to calculate when to go to sleep/wake up. It also tracks your sleep through sound and movement (which I don’t utilize as much, because sleep trackers tend to be a bit inaccurate at times). You can set up notifications to remind you when you should sleep and I prefer it over the default bedtime feature. And all of this is free!!

I’ve been using Sleep Calculator for about a year now and I am absolutely in love with it. This is an app I will use until the day I die !! The only confusing thing is when it says that it takes an average person 15 minutes to fall asleep, and goes on to say that if I were to go to bed right now I would wake up well rested at following times. Although I don’t know if I were to fall asleep in 15 minutes that the times I would wake up well rested would still be the same times. Please clarify !!!!!!

Been using this on my phone browser, great to have a more convenient app! It has a simple and cute design too. It's great for helping you feel the most refreshed in the morning regardless of how little sleep you actually got. Would recommend.