Review Insights · Google Play
Zero - Intermittent Fasting
Zero Longevity Science, Inc. · 61,112 ratings · ★ 3.8
3.8
★★★★★
61,112 ratings
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Top complaints - extracted from 75 negative reviews
Recurring phrases mined from 1-2★ reviews. The bigger the percentage, the more users have the same problem. Fix the top 2-3 in your version and you have product-market fit on day one.
1
"fast"
21 negative reviews mention this · 28% of all complaints
★★★★★ "Used to be free. I re-download it to start fasting again. Then asks me to pay $70." - Alaina MacFarlane
2
"load"
16 negative reviews mention this · 21% of all complaints
★★★★★ "Used to be free. I re-download it to start fasting again. Then asks me to pay $70." - Alaina MacFarlane
3
"doesn"
13 negative reviews mention this · 17% of all complaints
★★★★★ "Widget stopped working after 3 weeks. App is slow, doesn't load. No longer using as it is not reliable." - Mazvi Simoyi
4
"start"
12 negative reviews mention this · 16% of all complaints
★★★★★ "Used to be free. I re-download it to start fasting again. Then asks me to pay $70." - Alaina MacFarlane
5
"fasting"
12 negative reviews mention this · 16% of all complaints
★★★★★ "Used to be free. I re-download it to start fasting again. Then asks me to pay $70." - Alaina MacFarlane
6
"years"
11 negative reviews mention this · 15% of all complaints
★★★★★ "When I first got this app years ago it worked seamlessly and great. Now, without fail, the first time I open the app it shows a blank panel in place of my fasting timer. Every time I have to open the app, close the app, then open it again f…" - Alexander Hamilton
7
"screen"
11 negative reviews mention this · 15% of all complaints
★★★★★ "just an update, this app has now turned into a clunky app that quite often Largs or locks up when trying to save or start a fast Clean no fuss fasting app. No messy screens or nasty nagging. Easy to adapt and setup. Update now been on this …" - Pete
8
"free"
10 negative reviews mention this · 13% of all complaints
★★★★★ "Used to be free. I re-download it to start fasting again. Then asks me to pay $70." - Alaina MacFarlane
9
"work"
10 negative reviews mention this · 13% of all complaints
★★★★★ "The app was working great until their last large update. Now all the basic functions are very difficult to use. EDIT: I contacted and send a full bug report to the email provided and never got any replies and the app's UX is getting worse a…" - Charlotte Vallet
10
"timer"
9 negative reviews mention this · 12% of all complaints
★★★★★ "When I first got this app years ago it worked seamlessly and great. Now, without fail, the first time I open the app it shows a blank panel in place of my fasting timer. Every time I have to open the app, close the app, then open it again f…" - Alexander Hamilton
11
"other"
9 negative reviews mention this · 12% of all complaints
★★★★★ "just an update, this app has now turned into a clunky app that quite often Largs or locks up when trying to save or start a fast Clean no fuss fasting app. No messy screens or nasty nagging. Easy to adapt and setup. Update now been on this …" - Pete
12
"update"
8 negative reviews mention this · 11% of all complaints
★★★★★ "The app was working great until their last large update. Now all the basic functions are very difficult to use. EDIT: I contacted and send a full bug report to the email provided and never got any replies and the app's UX is getting worse a…" - Charlotte Vallet
📋 All 75 negative reviews
Every 1-2★ review we fetched. Use the copy button to grab them all for your own analysis (paste into ChatGPT/Claude with a prompt like "summarize core user problems, group by theme, ignore bugs, focus on missing features").
Used to be free. I re-download it to start fasting again. Then asks me to pay $70.
They put the monthly and annual views of the fasting calendar behind the paywall. Idiotic practice to take away functionality.
was perfectly fine till they just (april2026 time) changed the stats one can see as a non-premium user: used to show the length of each fast, like if start the 4th, go to the 12th, it'd show the time/length on calender... BASIC INFO, this. And now it only shows a circle per day of "+12hr"... and total time for mo/yr is blocked. This is a really scummy move, not cool at all. Basic info should be allowed for free users. Can see it via "data", but not in front page/simple access...
$70 year subscription nonsense
Used to be good. Now a glitchy mess. Have tried reinstalling but that didn't help. If you start a fast and want to change the time now there a glitch saying your change overlaps an existing fast. Takes a while to load, the UI is slow once it does. Lots of loading and freezing.
Unauthorized UPI Autopay debit via GPay amount (6300)I did not authorize this transaction. Kindly investigate and reverse the amount without concern you debit this very worst and fraud app I need my money back give your customer care number
the app is not letting me to try basic functions without entering my credit card details. the free trial has to be free
This app worked great once upon a time. Now it is a buggy laggy mess. Just as an example, I accidentally recorded a fast and it doesn't appear in recent fast history so there is no way to delete it. Also navigating and making any changes in the app takes forever, why is it so freaking SLOW?
bug that won't let you close out of the free trial offer. had to uninstall after 5 years as it's unusable now.
you want me to pay HOW MUCH for this app and I can't even put into it that I've had a gastric sleeve done so it can give me realistic goals to accomplish?!🙄😒
so user unfriendly. see no joy in using it. other apps are way more appealing
Too gimmicky, only use for fasting but the circles and constant requests to pay their extortionate subscriptions added to the recent forcing me to create an account and answer so many irrelevant and personal questions has forced me to uninstall.
app is laggy
it makes you fill in an entire questionnaire adding quite personal information about yourself, then tell you that you need a pay for the application for the year. No way to delete the data you've entered about yourself afterwards.
main screen disappeared. reboot phone and it starts working for the day and it's starts all over again.
SOMETHING IS WRONG WITH THIS APP! Whenever I go to open it, it is BLANK!!! FIX THIS!!! I have already uninstalled & reinstalled, restarted my phone, cleared cache, & IT IS STILL BLANK!!! *4/20 UPDATE - IT'S STILL DOING IT!!! I have to open & close the app SEVERAL TIMES before it actually opens!!!
I was likeing it at first. Lots of features. I tried plus because it allowed custom fasting over 24hrs. No other app i found so far allows custom fasts over 24hrs. However I cannot manually enter a 48 hour fast that i had started already before downloading this app. This means if i forget to hit the button to start my fast in the future. I will be unable to manually enter it. Which is not ok. Especially when paying for the app. 5 star rating turns into 1 star. Must be fixed if Im going to pay.
this app went from great to hate, it simply doesn't work anymore.
forced paid trial after all the setup.
Very disappointed, it often crashes or doesn't load even when uninstalled and reinstalled. Very inconvenient for consistently tracking and using the timer. Also tried exporting my data to analyze it and make my own graphs to find my trends because the graphs included even with the pro subscription are disappointing but the data is JSON & very difficult to work with. Seems it used to be CSV and easier to work with in the past (or possibly the apple version app?) according to reddit/Google.
$70 for a calorie counting app? 🤣 what a joke
I used this app for a few years. It was snappy, clean, did what it needed. But over the last few months it has just become unusable. Starting / stopping fasts only works about half the time. It's slow and buggy, no matter my internet connection or when I rebooted. Avoid, there are other alternatives that actually work.
It just keeps giving me a splash screen asking me to start a free trial of the pro version. I can't even see the app without giving my credit card details and starting a trial. predatory, and terrible UI. even if I swipe it away it just reopens the trial screen. there's no X button to close it, as a new user it's just horrible experience
it lags and suddenly the app turn to a white screen
The App Was Good until it forced a subscription on me if I wanted to access the app, I had to uninstall the app.
The app opens to a white screen on OnePlus Nord 7. Cannot track anything
Why does using the app require an internet connection? I just want to end my fast so I can eat but I've had to close the app multiple times to be able to load so I can end a fast, absolutely bad UX. If you really want my data then at just have it sync next time its able to, don't prevent me from ending my fast. Edit: I have gotten to the point of giving up on this app as the issue above continues and am now trying alternatives, I found one called Fast Times, that is free and works offline.
I've been using the app for years. Now, whenever I open it, I stare at a white screen. please fix this
This app used to be good, but unfortunately it doesn't want to work anymore. No matter what I do the app doesn't load.
With recent updates, it takes forever to load today's fast. Frustrating.
Stopped working. It doesn't load the page, it's totally blank.
the app don't work. I can never end my fast! dont waste your time. it's been having issues for awhile and they haven't updated or fix any issues
more often than not, the app does not load so I'm unable to accurately start or stop a fast in real time. I'll check back later and back date the start or stop if it happens to load, but the whole reason I wanted this app was to motivate me in my fasting - instead, it adds loads of unnecessary frustration to my life.
several primary sections of the app don't open on Pixel phone. now on my android tablet, I can't even log in, the app complains I have no Internet? every other app on the tablet has no problem using my internet connection...
Latest update broke the interface on Android. my wife has it on iPhone and she can no longer get in. We both paid for the pro version. Not worth the $120 spent! Look elsewhere for a better app.
I used this app for years and it's gotten progressively worse. First the ads started taking over, then the interface got less and less responsive, and now the app is outright broken. It just loads to a blank screen and sits there. You can switch between the pages, but the actual page to track your fast is blank. I'm so disappointed because I used to use this app daily. I'm going to be like another reviewer here and give up.
Bad engineering. Today I can't login due to their Google API expiring. The timer itself should be able to function offline.
does not work, but money they want for "pro" app 🙋
3 years later same consistent issue, slow doesn't work snappy. one click takes forever for the app to load. free version slow unable to use. used to work flawlessly, now for 3 years hasn't
i dont know what's going with the app, i cant login using my gmail account. I'm subscribed and pay for it but today i cant even login
app is broken. cannot stop fast, just seeing a white screen. seems like very basic functionality smh
used this app for years but with recent updates, it sometimes doesn't render anything, just a blank white box. this app should be essentially just a timer, so the fact that it has to render at all is concerning.
This app hasn't gone from bad to worse, day after day. Now, it barely loads. It takes 2-3 attempts to load the app to complete a fast. I can't understand it. Why is this so bad?
can't see my fasting time anymore.
can only start and end fasts through the widget and I can't change the length of the fast from one I choose MONTHS ago. This used to be my favorite app for years but it's gone downhill this last year or so.
it's just ads.
Useless updates that make the app even slower to run. Takes several minutes to even register/start a fast, and sometimes I must exit the app several times until it registers. Can't adjust the start time of the fast if the app didn't correctly register it earlier, says it "overlaps" and won't let you change at all. I've been using the app since 2019/2020 and I've never experienced such issues until recent updates. Very disappointed.
after two+ years I give up. notifications did calm down, but typically updates break something making me hesitate to apply them. the last few months I've been applying each update because they say they are fixing startup issues. my experience says each update made it worse until now it will consistently hang on start, unless I go in and force kill it first. second start after applying the update, it hangs. I give up.
Previous versions were much better. I'm uninstalling it right now.
Editing my review to 1 star because the app for some reason isn't showing the fasts that I have done between yesterday and today on previous fasting calendar.
+ 25 more in the clipboard copy
Sentiment summary
68%
Positive (4-5★)
7%
Neutral (3★)
25%
Negative (1-2★)