TOP 7 Intermittent Fasting Apps for iPhone (2025)

Intermittent fasting isn’t just some passing health trend anymore. 

It’s legit. 

And it’s helped me (and a ton of others) build a better relationship with food without obsessing over every damn calorie.

But let’s be real: sticking to a fasting window isn’t always easy. 

That’s where the right app can seriously change the game. 

I’ve tested a bunch of fasting apps over the past few months.

Some were great, some were straight-up useless, and I finally narrowed it down to the ones that actually do the job.

Let’s dive into the best intermittent fasting apps for iPhone that actually work in 2025.

1. Zero – I Like It the Most

Pros:

• Clean and easy to use
• Tracks fasting, weight, and mood
• Works well for beginners and pros
• Syncs with Apple Health
• Includes tips and expert-backed info

Cons:

• Most advanced features need a subscription
• Doesn’t give deep data unless you pay

Zero is the one I’ve stuck with the longest. 

I’ve tried other fasting apps that had fancy charts and all, but this one just works.

No noise, no pressure. 

You open it, start your fast, and that’s it. 

The layout is simple, not confusing, and it feels like it was made for real people, not tech nerds.

What I really like is that it doesn’t overwhelm you. 

Some apps throw in meal plans, calories, and a bunch of stuff you didn’t ask for. 

Zero keeps it focused. 

It tracks how long you’ve fasted, how you’re feeling, and even lets you note your mood or energy if you want. 

It also syncs up with Apple Health, so if you’re already tracking steps or sleep, it ties in nicely.

There’s also a section with helpful info.

Stuff like how fasting works, what it does to your body, and tips to make it easier. 

Nothing too science-y. 

Just easy explanations that make sense.

Now, the free version covers the basics, but yeah, if you want the detailed stats and personalized plans, you’ll have to go premium. 

But honestly, if you’re just starting out, you won’t even feel the need to upgrade at first.

If you’re serious about fasting and don’t want to deal with a complicated app, this is the one I’d tell my friends to try first.

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2. Fastic – Best for Visual Motivation

Pros:

• Fun design that shows your fasting progress
• Tracks water, steps, and habits
• Great for people who need daily motivation
• Has educational content and challenges
• Easy to use and beginner-friendly

Cons:

• Ads can be annoying in the free version
• Some tools are locked unless you upgrade

Fastic is the kind of app that makes fasting feel less like a chore and more like a challenge you actually want to complete. 

It’s got this colorful, almost playful design that shows how far you’ve come, and honestly, that visual progress bar is weirdly satisfying.

The moment you start using it, the app kind of cheers you on—like, “Hey, you’re 12 hours in! Keep going!” 

And for someone who needs a little nudge (me, every day), that makes a big difference.

It also tracks other stuff, like your water intake, how many steps you’ve walked, and even helps you build small habits over time. 

It’s not just about not eating.

It’s trying to help you build a healthier lifestyle overall. 

And it does that without being preachy.

There’s also a bunch of educational stuff baked in, like tips on how fasting affects your body, what to eat when your window opens, and simple health facts that don’t feel like reading a textbook. 

If you’re curious but don’t want to dive into heavy science, it hits that sweet spot.

Only downside? The free version comes with ads and pushes you to go premium sometimes. 

But even without paying, it gives you enough to stay on track.

If you’re someone who needs that visual push, like seeing your progress in real-time or being reminded why you started, Fastic is a solid pick.

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3. Simple – Best for Beginners

Pros:

• Super easy to set up and start fasting
• Clear schedule with daily fasting tips
• Reminds you when to start and stop
• Clean layout, nothing confusing
• Gives you helpful info along the way

Cons:

• Not great for advanced fasters
• Some features are locked unless you pay

If you’ve never tried intermittent fasting before, Simple is where I’d tell you to start. 

It’s made for beginners, like, even if you don’t know what 16:8 means, this app will walk you through it without making you feel dumb.

The setup is quick. 

You pick your fasting goal (like 14:10 or 16:8), and the app lays out a daily plan for you. 

When your fasting window starts, it reminds you. 

When it ends, it reminds you again. 

That’s it. 

Super chill, super doable.

What makes it even better is how it explains things as you go. 

Stuff like “Why you might feel a bit tired during hour 10,” or “What to drink while fasting.” 

It’s not spammy or robotic either.

It actually feels like someone wrote it to help you, not just fill space.

The layout is also clean. 

No ads popping up every two seconds, no complicated charts that make your head spin. 

Just a timer, a few stats, and tips that keep you in the zone.

Now yeah, if you’ve been fasting for a while or want to see deep insights, this one might feel too basic. 

But for starting out? It’s perfect. 

It gives you just enough structure to build the habit without throwing you in the deep end.

If fasting feels overwhelming, Simple makes it feel doable. 

Like a small step, not a huge life change.

4. Fasting Tracker – Best for Diverse Fasting Plans

Pros:

• Supports popular fasting styles like 16:8, 5:2, OMAD
• Built-in water tracker, weight log, and reminders
• Clean layout that’s easy to navigate
• Syncs with Apple Health
• Good for both men and women

Cons:

• Some features feel locked unless you upgrade
• Pushes premium stuff a bit too often

This one’s for the folks who want options. 

Fasting Tracker isn’t just about timing when you eat.

It gives you a full setup for managing your fast, your hydration, and your progress in one clean place.

It supports all the major fasting methods—16:8, 18:6, OMAD, 5:2, and even some advanced ones like autophagy and 10in2. 

So whether you’re keeping it simple or pushing the limits, the app’s got you covered. 

You just pick a plan, hit start, and the timer gets rolling.

What I really liked here is how it mixes in extras that actually help, like the water tracker (you’ll need it more than you think), weight tracking with trends over time, and gentle reminders that keep you in check without feeling pushy.

The design is solid. 

Everything’s easy to find, and the dashboard gives you a good snapshot of how you’re doing that day. 

It also connects with Apple Health.

So if you’re already tracking other stuff like steps or sleep, it pulls everything together in one place.

Only heads-up: the app does try to push its premium upgrade pretty often. 

And yeah, some of the deeper features are locked unless you pay. 

But even the free version gives you all the core stuff you need to stay on track.

If you’re looking for a fasting app that adapts to your style instead of boxing you into one routine, this one’s a solid pick.

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5. FastHabit – Best for Experienced Fasters

Pros:

• One-tap start makes it fast and simple
• Supports custom fasting lengths
• Calendar view to track streaks
• Apple Watch support
• Sends helpful reminders

Cons:

• No educational content or beginner guidance
• Design feels a bit plain and dated

If you already know what fasting is, how long you want to do it, and just need something that works, FastHabit is that no-nonsense app. 

It’s not trying to coach you or motivate you with flashy features. 

It’s just like, “You fasting today? Cool, let’s go.”

You tap once to start your fast, and that’s pretty much it. 

It tracks your progress quietly, shows you how long you’ve gone, and lets you end it with another quick tap. 

Done. Simple.

There’s a calendar that lets you see your streaks, and if you’re the kind of person who gets satisfaction from checking off days, you’ll like that. 

It also has Apple Watch support, so you don’t even need your phone nearby to start or stop a fast.

You can set up custom fast lengths, too. 

Whether you’re doing 14 hours, 16:8, OMAD, or even longer, it doesn’t box you in. 

You pick the time, and the app just rolls with it.

That said, it’s not for beginners. 

There’s no guide, no articles, no advice.

It assumes you already know what you’re doing. 

And yeah, the design isn’t fancy. 

But that’s kind of the charm.

It gets out of your way and lets you focus.

If you’ve been fasting for a while and just want a clean, reliable tool to track it, FastHabit won’t let you down.

6. Window – Best for Customization

Pros:

• Fully customizable fasting plans
• Simple layout with relaxing design
• Offers daily tips and fasting insights
• Good for tracking weight and progress
• Doesn’t overwhelm with features

Cons:

• Limited features in the free version
• Might feel too basic for data lovers

Window is one of those apps that makes you want to open it. 

It’s easy on the eyes, calm in the way it works, and super flexible. 

You don’t have to follow someone else’s fasting schedule.

You can build your own. 

14:10, 17:7, 20:4… whatever feels right for you, Window lets you set it up.

What makes this one stand out is the balance. 

It gives you structure, but it’s not rigid. 

You get a daily view of how your fast is going, plus some small health tips and reminders that keep you on track without trying too hard. 

You can also track your weight, which pairs nicely with the fasting progress screen. 

The layout’s simple.

Nothing complicated, no wild graphs, and no confusing dashboards. 

Just a timeline and your goal. 

The free version covers most of the basics, but if you want access to more insights or tips, you’ll need to go premium. 

That said, the core experience still feels complete.

If you’re looking for a fasting app that lets you go at your own pace and doesn’t overwhelm you with info, Window is a great choice. 

It keeps things flexible, calm, and super easy to stick with.

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7. Fastient – Best for Journaling Your Progress

Pros:

• Built-in journaling to log how you feel
• Simple and clean fasting tracker
• Graphs to show progress over time
• Syncs across devices
• Minimalist design, no distractions

Cons:

• No coaching or guided tips
• Might feel too plain for some users

If you’re the kind of person who likes to jot down how you’re feeling during a fast, or just track more than numbers, Fastient is the one you’ll vibe with. 

It’s not loud, it’s not trying to be trendy. 

It just gives you a space to fast and reflect.

The interface is super clean. 

You set your fast, watch the timer roll, and when you’re done, you can leave notes on how it went. 

Hungry? Tired? Feeling good? 

You can track all of it. 

Over time, that journal becomes a powerful tool to notice patterns, like, “Okay, hour 13 is always tough for me,” or “I feel best when I break fast with something light.”

You also get graphs that show your weight changes and fasting history, which is perfect if you like to see long-term trends. 

And since it syncs across devices, you can log in from your phone or computer and pick up right where you left off.

There’s no coaching or content baked in, so if you need someone to guide you through fasting, this one might feel too quiet. 

But for self-motivated folks who just want a clean space to track and reflect, Fastient gets the job done.

It’s not about hype, it’s about habit. 

And this app respects that.

My Final Take

Alright, here’s the deal—there’s no one-size-fits-all when it comes to fasting apps. 

I’ve tried more of them than I’d like to admit, and honestly? 

Most are either too pushy, too complicated, or straight-up boring. 

But the ones in this list? These actually helped me stay consistent without driving me nuts.

• If you’re just starting out, go with something like Simple or Fasting by At Ease.
• Wanna geek out on progress and stay locked in visually? Fastic brings that daily dopamine hit.
• Prefer a quiet, flexible setup? Window or Fastient will vibe with your style.
• And if you already know what you’re doing and just want a clean, fast tool, FastHabit is your guy.

But if I had to pick one? 

I’m still sticking with Zero. 

It just feels solid. 

Not too flashy, not too stripped-down, just reliable.

Bottom line? Try one or two. 

You’ll know when it clicks. 

Because at the end of the day, the best fasting app is the one that actually keeps you going when your stomach’s growling and your brain’s whispering “maybe just one snack.” 

Been there.

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