The 4 Best Intermittent Fasting Apps in 2026
Intermittent fasting has become one of the most widely followed approaches to weight control, and its success rests on something very simple: knowing when you start, when you stop and staying consistent. Which is exactly what an app does well. In this guide we compare the 4 best intermittent fasting apps in 2026. Remember: fasting is not right for everyone; if you have any health concerns, talk to a professional first.
Top apps for intermittent fasting
Apps with a fasting timer, 16:8 and custom protocols, fasting-phase tracking and plans that adapt to your progress.
Top pick
BodyFast: Ayuno Intermitente
Free (with purchases) · 10M+
Best in Spanish
4.6
369K reviews
TopApps analysis
BodyFast pairs a timer with a weekly Coach that adapts the plan to your progress, more than 10 protocols and clear explanations, all in Spanish.
BodyFast is one of the most complete intermittent fasting apps around, developed in Germany: beyond the timer, its weekly Coach suggests fasting plans that adapt to your progress, across more than 10 different protocols. It also brings challenges, weight and water tracking, and clear explanations so you can start safely.
Pros
- Weekly Coach with adaptive plans
- More than 10 fasting protocols
- Clear, well-translated interface
Cons
- The personalised Coach is a paid feature
- Ads in the free version
- Fasting is not suitable for everyone
Zero: Ayuno Intermitente
Zero Longevity Science · Free (with purchases) · 1M+
The most popular
4.1
61K reviews
TopApps analysis
Zero is the global benchmark: its timer shows the phases of your fast in real time, explaining what is happening in your body at each moment.
Zero is the world's most popular intermittent fasting app: a fasting timer with the usual protocols (16:8, 18:6, OMAD), trend charts and educational content from well-known doctors. Its timer shows the phases of your fast in real time, explaining what's happening in your body at each stage.
Pros
- The most popular fasting app
- Shows the phases of your fast in real time
- 16:8, 18:6, OMAD and custom protocols
Cons
- Advanced statistics are paid-only
- Largely in English
- Fasting isn't suitable for everyone
Yazio: Contador de Calorías
Free (with purchases) · 50M+
Best fasting + calories
4.5
828K reviews
TopApps analysis
Yazio combines its fasting timer with its calorie counter, the complete pairing for anyone who also wants to control what they eat during the window.
Yazio is a clean, highly visual calorie counter built for weight loss and intermittent fasting. It lays out your daily calorie budget in plain terms, draws on a database of more than 4 million foods and comes with a library of healthy recipes. A good fit for anyone who wants a tracker that looks good and is easy to stick with.
Pros
- Very clear interface for losing weight
- Includes intermittent fasting tracking
- More than 4 million foods in the database
Cons
- The free version is fairly limited
- Full meal plans and recipes are PRO only
- Ads in the free version
Lifesum: Contador de Calorías
Free (with purchases) · 10M+
Best all-round approach
4.5
376K reviews
TopApps analysis
Lifesum builds fasting into its eating plans, with an assessment of the quality of your diet that goes beyond the clock.
Lifesum combines calorie counting with eating plans (keto, Mediterranean, fasting and more) wrapped in a genuinely attractive design. Beyond logging meals, it rates the quality of your diet and gives personalised advice on eating better, not just less. A good fit for anyone wanting to improve their habits with a modern, motivating app.
Pros
- Diet plans (keto, Mediterranean, fasting)
- Rates the quality of your diet
- Modern, motivating design
Cons
- The best features are in the Premium version
- Database somewhat smaller than MyFitnessPal's
- Full plans need a subscription
Frequently asked questions
Which fasting protocol should I start with?
16:8 (16 hours fasting, an 8-hour eating window) is the standard starting point: in practice it means skipping breakfast or dinner, and most people tolerate it well. Longer protocols (18:6, OMAD) are worth trying only once 16:8 feels comfortable. BodyFast makes this particularly easy: its coach starts gently (12:12, 14:10) and steps up according to how you respond, which is the sensible approach.
What can I drink during the fasting hours?
Water without limit, black coffee and unsweetened teas: that is the general consensus and what these apps' timers assume. Anything with calories (milk, juice, sugary soft drinks) breaks the fast. Sweeteners are debated ground; if you want to be strict, avoid them. Zero includes articles written by doctors that explain these nuances in detail.
Is intermittent fasting safe for everyone?
No. It is not advised during pregnancy and breastfeeding, for people with a history of eating disorders, for medicated diabetics (risk of hypoglycaemia) or for minors, among other cases. If you take long-term medication or have any health condition, check with your doctor before starting. For everyone else, the evidence places it as one more tool for calorie control: it works if it fits your life, not by magic.
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