Fast User Reviews

Customer Experience

Positive experience75.0% of reviews
Neutral10.6% of reviews
Negative experience14.4% of reviews

~ Based on 188 written reviews from the US App Store.

What users say

Is Fast Safe?

Fast: Intermittent Fasting App appears safe based on user ratings. AppsHunter Safety Score for Fast is 94/100.

This assessment is based on 3,268 user ratings, with an App Store average of 4.7/5.

Safety Analysis

91.8% of ratings point to a safe experience
4.8% of ratings suggest some concerns
3.4% of ratings point to a risky experience

~ Based on 3,268 App Store ratings for Fast.

Is Fast Legit?

Fast: Intermittent Fasting App appears to be a legitimate app. AppsHunter Legitimacy Score for Fast is 90/100.

Based on 90 of 100 points across 7 verification signals from App Store and developer data.

Top reviews

I’ve tried them all!

I’ve tried every fasting app and always come back to this one. My favorite feature is the timer that also educational. It helps awareness of your internal process like when you are lowering your blood sugar, in the fat burning zone, the ketosis zone. It is extremely motivational! Another feature that is extremely beneficial is it reminds you to drink and log your water! I often get my hunger and thirst cues intertwined so it’s really trained me to hydrate when I used to binge. I also can’t live without the notification that helps you remember to start your fast! It has cut out my late night munchies and blood sugar roller coaster!
Show more

Everything is broken - 0 STARS

I got this to share with my friends my fasting journey. It never worked. All my trophies for meeting goals never saved. So many features never worked
and I tried to reach out for customer support as well. I will be vsnkng my membership right before the 1 month mark. I feel robbed.

So far so good

I like the reminders that this app gives me. I am still having a hard time connecting with friends on this app but I like the data and analytics portion that is keeping me motivated to stick with it and keep going. I only started using the app for a week, but I have already lost about 4 pounds. I think this app really helps me stay motivated and I’m looking forward to trying the pro version.
Show more

Excellent for beginners

I love the ability to go back and add additional time, if I forgot.

My review.

This app is so colorful. Although it doesn’t allow me fast track my fast but it’s great. I think that’s a feature that should be worked on. Say I started my fast 17:30 and the time I ended the last fast was 17:10, I should be able to take my fast to 17:30. More accuracy.

Great tool

Great tool for keeping track of your progress, which helps me stay motivated, focused, and consistent while clearly seeing small wins over time.

Love it!

This app helps keep track of my fasts and shows me what is going on with my body as my fast progresses. I can also log my weight to keep up with everything.

Works wonderfully apart from

Conversions (lbs to kg) but that’s really not a big deal :)

I LOVE THIS APP.

It’s the best App. out because it’s cost effective @ $29.99 a year. I love the way it is designed, it reminds me to drink also & encourages you in other ways. Best App. Out

Version gratis perfecta

Me gusta que obtengo lo que necesito gratis pero si eres principiante te recomiendo comprarla unos meses para que aprender sobre esta manera increíble de vivir

Best fasting app

This app has been the most useful tool in my journey to better health. The app is easy to use and allows me to simply track the progress of my daily fasts. I tried fasting without it and found myself unable to keep track. I highly recommend this app if you are just starting out or even an expert at fasting. It keeps me on track each and every day. I wouldn’t have been as successful in my health journey without it.
Show more

Logging weight

Please correct logging weight feature. Doesn’t record weight selection correctly within the 150 to 160 range. Example: if 155 selected, it records 154, if 153 selected, it records 154, if 152 selected, it records 151. Thanks

Easy Peasy

Using this app is simple which makes it perfect.

Got yo have this app !

If you’re a beginner or even if you’ve dabbled intermittent fasting, you’ve got to get this app. Not only does it keep you on task but it also make sure that you have enough water and you’re exercising . This app makes your journey fun and simple. A must have to teach your fitness goal.

Food

No where to chart food

U can just use stop watch on ur phone

I paid I think 28.99 for 3 months something like that. I wish I hadn't this is not much more than a stop watch with notification if you hit your stopwatch on your phone & leave it going while you are fasting at least 12 or 15 hours a day to start. I can't see anyway to track my weight I did link my Apple Watch to it just today I'll see if that even shows up ANYWHERE on this. I had a fasting app last year & I thought maybe this was it but the other app had recipes for very healthy & had light exercises to do while fasting long fasts it had very easy exercises. Just enough & all with videos & recipes had color pictures this is so basic at least in May of 2025 it is if it's a long time in maybe the app will change I hope & offer more for the money bcz right now you could track your weight & even your fasts for free in notes on ur phone & time them on your stopwatch. The few articles it gives you about fasting times are free on google just look it up & save yourself 30 dollars!! I really wish I could give a better review 2 stars is generous with this 5/2025 app version. I'd skip this one
Show more

Love it

Love it

The best app

I have the best experience so far. I feel this app keeps me more focused motivated and organized with the intermediate fasting

Fasting App

18:6 intermittent fasting, where you fast for 18 hours and eat within a 6-hour window, is an effective approach to weight management and improving metabolic health. The fasting window encourages your body to burn fat for energy while enhancing cellular repair. Using an app to track your fasting schedule makes it easier to stick to your goals. It helps monitor eating windows, reminds you to hydrate, and records progress, providing motivation and accountability. The app also offers helpful insights, like tracking sleep patterns and physical activity, ensuring that fasting becomes part of a balanced, healthy lifestyle.
Show more

Glitchy

I like this app and use it to fast with my friends. I think it has a lot of potential but the analytics are buggy to say the least. It’s always adding extra fasts, the hours on the graph are not accurate on the “all” tab, and the refresh rate for the app in general is so slow I have to hard close it and open it again for accuracy. For example if I opened my app at 4:45, and then open it again at 5:30 to start my fast, my app will start the fast at 4:45 because it still thinks it’s 4:45. Please do bug fixes and keep working on your app. It’s disheartening the last update was three months ago (as of writing this review).
Show more