I paid for a year-long subscription with this app, during which time they never fixed a major bug with the way the app syncs to other health apps to give you personalized insights during your fasts. I reached out to them multiple times — each time, they blamed the other apps, even though none of those other apps had any other syncing issues and worked seamlessly with each other and with Apple’s Health app. Since they never fixed this major issue, I let my subscription expire, figuring I’d just use the simpler features offered on the free version (without personalized insights, basically a slightly more sophisticated timer app). Then with the most recent update, THEY REMOVED ALL OF THESE FEATURES as well, hiding them behind a paywall!!! The free version is now just a simple timer, and they’re asking users to pay more money for the same un-updated content that used to be free. If they had made any actual improvements to the app during the year I was subscribed, or even just added additional useful content, I would still be a subscriber. Instead, they’re removing features hoping to trick people into paying over and over again for the same simple product. Don’t waste your money thinking they’ll give you regular updates or improved features, they won’t. Every “improvement” has been to increase prices while removing features and only making minor cosmetic changes.

I love this app and it is very informative and makes fasting a lot more positive. Now that I've finally started understanding what my body is doing during a fast and how I can accelerate fat burn during one I have had a ton of success. From weight loss to more energy and a better mental state, they have all improved. The one thing I would like to see be better is the food intake logging, sleep and hydration. They have you type a few words and it's very vague and not exact. I feel as though precision is key with understanding your health and every little detail you can add matters. I have another app I use to log everything I eat, drink and take as well as what workouts I do and how long and it works great. However, I don't get the knowledge and advice I get with Zero and it doesn't put the Fasting center stage like Zero does. Combined, they are great, but if I could scan a barcode and have my intakes recorded with Zero too I think I would have a better understanding of why I'm seeing results and how to be even more successful in the future. Just my two cents! I'm a premium subscriber and my experience has been extremely positive so it's obviously worth it!

21 Nov Update: The developers reached out to me from my initial review and were super helpful and were able to walk me through how to better navigate the app. My lack of understanding how to fully use all the features is why I struggled to change fast settings without saving it as a preset. Due to their amazing response, explanations and helping me fix my complaints deserves 5 stars. It’s definitely worth the subscription and has earned 5 stars in my book.👌🏾 I can recommend this app 100% ⭐️⭐️⭐️⭐️⭐️ ————————————————————— It’s ok, I love the majority of the features. & unfortunately I forgot to cancel after my free trial. But it’s not worth $70/year. I don’t understand why there isn’t an option to shift or plug in a fast without having to make it a preset. Life happens and I sometimes do an odd hour fast just to get back on track. But that doesn’t mean I want it to be saved as a preset. You should have the option to just put in a fast without being forced to save it as a template. They’re typically one off fasts. The lack of flexibility there is annoying. It’s also odd that it’s not an option under the premium section. If I’m paying to track my fasts it should be a bit more flexible for the price we’re paying. I’ll look for another app that has this simple feature. It’s great aside from that.