i
16:8, the eight-hour window.
Sixteen hours fast, eight hours eat. Most people pick midday to 8pm or 10am to 6pm. The timer sits on the home screen so you can glance at it without opening anything.
14:32 to go
PRO
Fasting tracker · iPhone
The UK fasting tracker that lives next to your food.
16:8, 5:2, OMAD or a pattern you make up yourself. A live timer that shows what's left of the fast, a history that holds every session, and a streak that doesn't break the diary when you skip a day.
NutraSafe Pro £3.99 a month or £34.99 a year iOS only Cancel any time
01
What the tracker holds
Six tiles,
one timer.
The common patterns, plus a custom builder for the one you've settled into. The timer and the food log share the same diary, so what you broke the fast with is sitting right there.
ii
5:2, the two-day version.
Five normal days, two low-calorie days. Pick the days, the tracker keeps a weekly count and tells you which day of the seven you're on. The NHS lists 5:2 as one of the patterns people use.
iii
OMAD, one meal a day.
23 hours fast, one hour eat. The most extreme of the common patterns. The timer counts the long stretch and reminds you the eating window is coming.
Fast
23h
Eat
1h
iv
Custom pattern, your hours.
18:6, 20:4, alternate-day, weekends only. Set the start and end of the eating window and the tracker remembers it. Adjust it on Sunday for a long brunch without breaking the streak.
Your window
11:00 to 19:00 · 8h
18:6
v
Timer + history, not just a counter.
Every fast you finish lands in the history. You can see what you planned, what you actually did, and the trend week on week. Calendar view, list view, your call.
vi
Streak that doesn't shame you.
Hit your target window six days in a row and the streak shows it. Skip Sunday for a family lunch and the streak resets without a guilt-trip notification. Pick it back up on Monday and you carry on.
This week
5 / 7
Last week
7 / 7
Two weeks ago
6 / 7
02
How fasting + the diary work together
One screen.
The whole day.
Most fasting apps stop at the timer. The window is only half the story; what you ate in the other half is the bit that decides whether the week went well. Both sit on the same diary page.
Break-fast meal, ready to log
The timer screen shows the meal logger as soon as the window opens. Scan a barcode, type the food, or pick from your saved meals. No app switching, no losing the thread.
NRVs across the eating window
A shorter eating window means fewer chances to hit your vitamins and minerals. The diary shows the UK NRV bars (14 vitamins, 13 minerals) so you can see what the eight-hour window actually delivered.
Protein, calories and macros in plain view
Calories eaten, protein hit, carbs and fat. The same bars the rest of the diary uses. A fasting window that lands at 1,800 kcal sits next to a window that lands at 2,400 so you can see the difference.
When to ask a clinician, not the app
The NHS and the British Dietetic Association are explicit that intermittent fasting isn't suitable for everyone (pregnancy, eating-disorder history, type 1 or insulin-managed type 2 diabetes, under 18s). We're a tracking tool, not a clinical service. The right move is to take what you logged to your GP or a registered dietitian.
03
A fasting day, on a page
What 16:8
actually looks like.
A 16:8 day in progress. Timer counting down, plan filled in for the window that's coming, breakdown of what you ate in last night's window and how it scored against the day.
One Thursday afternoon, in the fasting view.
The timer started at 8pm last night. Five and a half hours until you break the fast at midday. The diary has yesterday's eating window logged, so the NRV bars and the protein total are already there for context.
i.
Pick a pattern, or build one.
16:8, 18:6, 20:4, 23:1 (OMAD), 5:2 or your own window.
ii.
The timer counts from when you ate last.
Start it manually, or tag the last meal as the start.
iii.
Window opens, food log opens with it.
Break-fast meal scanner already on the same screen.
iv.
Session lands in history.
Planned vs actual, streak count, weekly chart.
04
Questions people ask
Frequently
asked.
The questions we see from people picking up 16:8 for the first time, and from the people who've been doing it for years and want the food side to keep up.
Can I track 16:8 and 18:6 fasting windows?
Yes. NutraSafe supports 16:8, 18:6, 20:4, 23:1 (OMAD), 5:2 and custom windows. Pick the pattern in settings and the timer adjusts to it.
Does it remind me when to start and stop fasting?
Yes. Set reminders for fast start and window open, so you know when you can eat without keeping the app open. The Live Activity and widget show your progress, including the halfway point, at a glance.
Can I log food and micronutrients on the same day?
Yes. The fasting timer and the food log share the same diary. Macros, calories, 14 vitamins and 13 minerals against the UK NRV all sit on the same daily page, so you can see what an eight-hour window actually delivered.
Does the timer need the food log to work?
No. The timer runs on its own. Pairing it with the food log gives you the wider picture, but if all you want is the timer and the streak, run the timer alone. The rest of the diary stays out of the way.
Can I track 5:2 days, not just daily windows?
Yes. 5:2 is a built-in pattern. Pick the two low-calorie days, the tracker counts them in the weekly chart, and the calorie target on those days adjusts to the lower number you set (the original Mosley protocol was around 500 kcal for women and 600 kcal for men).
Is the fasting tracker free?
The download is free. The fasting tracker sits inside NutraSafe Pro at £3.99 a month or £34.99 a year on iOS. The free tier covers food logging (up to 25 entries a day) and barcode scanning. Fasting, workouts, AI Coach and the suspected-triggers analysis are part of Pro.
Is fasting right for everyone?
No. The NHS and the British Dietetic Association are explicit that intermittent fasting isn't suitable in pregnancy or breastfeeding, with a history of eating disorders, with type 1 or insulin-managed type 2 diabetes, or for under 18s. We're a tracking tool, not a clinical service. If any of those applies, take what you've logged to your GP or a registered dietitian rather than relying on the app to decide.
Start the timer.
Log the meal that breaks the fast.
All on the same diary.
Get NutraSafe on the App Store
→
16:8, 5:2, OMAD or your own pattern. Timer, history, streak, and a food log on the same diary. NutraSafe Pro £3.99 a month or £34.99 a year on iOS. Cancel any time inside your Apple subscriptions.
iPhone · iOS 17 · Cancel any time14:32