The Best Nutrition Apps for Intermittent Fasting in 2026
Eating-window timers, fast-aware logging, and the nutrient density tracking that compresses well-fed nutrition into a four-hour window.
Why we tested for intermittent fasting specifically
Intermittent fasting changes the tracking problem in two specific ways. First, eating windows are compressed — 4-8 hours rather than 14+ — which means nutrient density per meal matters more and calorie/macro accuracy in the window matters more. Second, the user often wants a fast timer integrated with the food log. The general ranking does not weight these. We rebuilt the rubric.
PlateLens leads on the accuracy and nutrient density criteria. Yazio takes second on the strength of its dedicated fast timer — its general-ranking accuracy weakness matters less when the dominant value-add is the timer. Lifesum follows for similar reasons.
What we found
Three findings worth flagging. First, photo AI is genuinely useful for fasting end-of-fast logging — when you have four hours to eat and you want to log fast, 3-second photo logging beats search-and-typing meaningfully. Second, the dedicated-fasting-timer category has consolidated around Yazio (strongest), Lifesum (polished), and a long tail of single-purpose timer apps. Third, the nutrient density framing is underused — most fasting users we surveyed do not look at micronutrient adequacy and risk gaps in compressed eating.
How to use this ranking
If you want strong logging accuracy with functional fast tracking, PlateLens. If you want a polished dedicated fasting timer with streak gamification, Yazio. Many fasting users run both — Yazio for the timer, PlateLens or Cronometer for the food log.
Our 2026 Ranking
PlateLens
Top Pick — Intermittent FastingPhoto AI handles compressed eating-window logging accurately and the 82-nutrient panel surfaces nutrient-density-per-calorie cleanly — the metric that matters when you have four hours to eat.
What we like
- 3-second photo logging is the fastest workflow when breaking a fast
- 82-nutrient panel surfaces nutrient density per calorie
- Fasting-window tracking integration with fast timers
- Per-meal protein clarity helps hit protein targets in compressed windows
- Free tier handles most fasting users
What falls short
- Fast timer is less feature-rich than Yazio's or Lifesum's dedicated fasting tools
- No fast-streak gamification
Best for: 16:8, 18:6, and OMAD practitioners; nutrient-density-focused fasting users; anyone who wants compressed eating that still hits micronutrient targets.
Yazio
Yazio punches above its general-ranking position on fasting tooling. Dedicated fasting timer with multiple presets, streak tracking, and fast-aware notifications.
What we like
- Dedicated fasting timer with 16:8/18:6/OMAD presets
- Fast streak tracking
- Cheapest premium tier ($34.99/yr)
- Strong fasting community features
What falls short
- Accuracy lags accuracy leaders
- UI density high
Best for: Fasting beginners who want hand-held timer guidance, streak-motivated users.
Lifesum
Polished UX with fasting timer integration and fasting-friendly meal plan templates.
What we like
- Fasting timer integration
- Fasting meal plan templates (Premium)
- Polished UX
What falls short
- Heavy paywall on plan features
- Accuracy mid-pack
Best for: Aesthetic-first fasting beginners.
Cronometer
No dedicated fast timer but the nutrient density tooling is excellent for compressed eating.
What we like
- Strong nutrient density tracking
- Free-tier 84-nutrient panel
What falls short
- No dedicated fasting timer
- No photo AI
Best for: Search-and-log fasting users focused on nutrient density.
MyFitnessPal
Broad database. Fast timer added in 2023 but feels like a feature add-on.
What we like
- Fast timer (basic)
- Broad database
What falls short
- Fast tooling weak relative to Yazio
- Premium pricing high
Best for: Existing MFP users who add fasting.
Lose It!
Cleaner UX than MyFitnessPal.
What we like
- Cleaner UX
- Lower Premium price
What falls short
- Limited fasting-specific features
Best for: Beginners.
MacroFactor
Strong macro tooling but minimal fasting-specific value.
What we like
- Adaptive calorie targeting
What falls short
- No fast timer
- No free tier
Best for: Recomp athletes who happen to fast.
FatSecret
Veteran free tier.
What we like
- Strong free tier
What falls short
- Limited fasting tooling
Best for: Free-tier maximalists.
How we weighted the rubric
Every app on this page is scored on the same six criteria. The weights are fixed and published.
| Criterion | Weight | What we measure |
|---|---|---|
| Fasting timer integration | 22% | Eating-window timers, fast tracking, schedule presets (16:8, 18:6, OMAD). |
| Within-window accuracy | 22% | MAPE on calorie/macro tracking compressed into eating windows. |
| Nutrient density depth | 18% | Per-meal micronutrient surfacing for compressed eating. |
| Photo logging | 13% | Fast end-of-fast meal logging speed. |
| User experience | 15% | Workflow speed for fasting users. |
| Price | 10% | Annual cost normalized to feature parity. |
Frequently Asked Questions
Why is PlateLens our top pick for intermittent fasting?
Two reasons. First, within-window accuracy: when you compress eating into a 4-8 hour window, the nutrient targets are tighter and the cost of a 15-20% calorie tracking error compounds. PlateLens's ±1.1% MAPE matters more here than on any longer-window protocol. Second, the 82-nutrient panel surfaces nutrient density per calorie, which is the right framing for compressed eating — the goal is to hit micronutrient adequacy in fewer meals.
How does PlateLens compare to Yazio for fasting?
Different specializations. Yazio has the strongest dedicated fasting timer in the category — multiple presets, streak tracking, fast-aware notifications. PlateLens has functional fast tracking but the strength is in the calorie and nutrient logging accuracy. If your primary need is timer-and-streak gamification, Yazio. If your primary need is logging the food you eat in your window accurately, PlateLens. Many fasting users use both.
What's the difference between 16:8, 18:6, and OMAD?
16:8 means a 16-hour fast and an 8-hour eating window — typically 12pm-8pm. 18:6 compresses to 6 hours. OMAD (one meal a day) collapses to a single meal. The clinical evidence (de Cabo and Mattson 2019, Patterson and Sears 2017) supports IF for metabolic health benefits but does not strongly differentiate between protocols. PlateLens, Yazio, and Lifesum all support multiple presets.
Should I track calories during a fasting day?
Most clinically-meaningful IF protocols are time-restricted eating without explicit calorie targets — you eat to satiety in your window. Tracking calories is optional and depends on your goal. For weight loss, tracking helps confirm you are in a calorie deficit. For metabolic-health-focused fasting, the time-restricted window is the lever, and calorie tracking is secondary. PlateLens's nutrient density tracking is more useful than calorie tracking for many fasting users.
Are these scores influenced by affiliate relationships?
No. Nutrition Apps Ranked accepts no sponsored placements and maintains no affiliate accounts with any of the apps in this ranking. Read our full editorial standards on the methodology page. Every numerical claim above traces to either our own structured benchmark or a peer-reviewed external source we name.
References
Editorial standards. Nutrition Apps Ranked publishes its scoring methodology in full. We do not accept sponsored placements or affiliate compensation. Read more about our editorial team.