Any diet. No calorie counting.

• 0 journeys started since 2020
• 0 diet periods kept on one timeline
• 0 diets and treatments in one place
• Free to use. Plus is optional.

Journeys and periods counted across Undiet since the first version in 2020.

The timeline

Every diet on one line.

Drag along the curve. The readout shows the weight, the date and the diet you were on that day.

An example journey: no diet, then GLP-1, then fasting 16:8. In the app the line is yours.

Your line starts with today. Get Undiet.

Switching

Change diets. Keep the history.

Tap up to two diets. The timeline redraws, and nothing you logged is lost.

In the studies, about 9.2 kg lower after 15 weeks on Keto, then about 1.1 kg lower after 12 weeks on Fasting 16:8 (the study stopped at week 12, so the line holds flat after it). One line, 8.4 kg lower across both.

Keto:Foster et al. 2010, randomised, low carbohydrate (20 g a day induction) vs low fat, n 307, 2 years: 12.2 kg lower at 6 months, 10.9 kg at 12 months. With weekly group behavioural sessions for 20 weeks and prescribed walking. The low fat arm lost the same amount, so most of this line is the programme, not the carbohydrate rule.

Fasting 16:8:TREAT, randomised, 16:8 (noon to 8 pm) vs three structured meals, n 116, 12 weeks: 0.94 kg lower at 12 weeks vs 0.68 kg in the control group. No calorie target, no counselling, daily weigh ins on a connected scale. 141 were randomised and 116 analysed.

The switch:Hall et al. 2016, n 17: in the first 15 days of an isocaloric ketogenic diet body weight fell 1.6 kg, which the authors attribute mainly to water, with fat mass down only 0.2 kg. When a keto or low carb period ends and the next one is not low carb, that 1.6 kg of water is modelled as returning over 15 days. A metabolic ward study of 17 men; the return is a model, not a measured figure.

Study averages, scaled to a 96 kg start. Each period follows its own study from that study’s first week; no study tested one diet after another, and an average says nothing about any one person. Every study, figure and conversion:Where the numbers come from

Mark what you are on. Get Undiet.

The check-in

Effort, not calories.

Two taps a day: your weight and how the day felt. Slide the comb and read what the app says back.

A good day. The graph will remember this one.

Two taps a day. Get Undiet.

Photos

Photos never leave your phone.

The app cuts you out of the photo, lines up any two dates and blends between them. All of it on the device. Nothing is uploaded, not even to us.

The person stays, the room goes.

Cut out on your phone, not in a cloud.

The person segmentation built into the phone separates you from the background. The photo is never sent anywhere to be processed.

Keep the photos yours. Get Undiet.

Community

Credits for showing up.

You earn credits for taking part, never for kilograms. Tap a day and watch them land.

• mara 2h

  Day 3 of keto. Dreamt about bread. It was a good dream.

• tomas 35m

  Meal prep Sunday. Six boxes of the same lunch. Monday me is grateful. Thursday me will file a complaint.

• leni 1h

  Mediterranean week 2. I have become olive oil.

• ines 4h

  Dose day. Nausea 3/10, feelings 7/10, cheese 0/10.

• jo 12m

  Skipped the scale today. It can wait. I cannot wait for coffee.

• aki 3h

  Low carb, day 9. I looked at a potato for a long time. The potato looked back.

• sofia 6h

  Back after a month off. The timeline kept everything. Rude, but fair.

• noor 1d

  No diet this month and that is a decision, not a failure.

Example posts. Real ones are moderated, under nicknames, and never show photos.

Say how today went. Get Undiet.

GLP-1 and after

GLP-1, and the months after.

Log doses, appetite and feeling as a period like any other. When the therapy ends, the timeline keeps going.

Undiet does not give medical advice. Never change a prescribed dose because of something you saw in an app.

Undiet Plus

The journey is free. The long view is Plus.

Tracking, the catalog, the photos and the community cost nothing. Plus removes the two time limits and adds stats per diet period, with 7 days free on the yearly plan.

The whole journey, on one timeline.

• Daily check-ins: weight and feeling
• Quick logs: meal, drink, movement, note, dose
• The catalog of 98 programs
• The weight trend, last 90 days
• Private photos, last 30 days
• The community, credits included

Or €6.99 a month. The free trial is on the yearly plan.

• Everything in Undiet
• Unlimited photo history
• The full weight trend over all time
• Stats for every diet period

Billed through the App Store or Google Play. Cancel any time in your store settings.

What exactly Plus adds, and what stays free

Questions

Short answers.

Is Undiet a diet?

No. It is a companion for whatever you are doing, including nothing in particular. It keeps the record and shows you the picture.

Do my photos ever leave my phone?

No. They are processed and stored on your device only, and there is no share button. Delete the app and they go with it.

What happens to my data?

Your account, check-ins and posts live on servers in the EU. You can export everything, and closing your account deletes it all at once.

Is this medical advice?

No. Undiet records what you log and draws the trend. Talk to your doctor about any diet, fasting protocol or medication.

What does Plus add?

Unlimited photo history, the full weight trend and stats per diet period. Everything else stays free, and the free app keeps the last 30 days of photos and 90 days of trend.

More in theprivacy policy, theterms of useand on thesupport page.

On iPhone and Android

Start with today.

Free on iPhone and Android. Two taps a day, one timeline.