FatForecaster
12 questions- Measuring and logging3
- Reading your numbers2
- When progress doesn't match your logs1
- Body fat and lean mass3
- Your data3
Questions and answers
Search all 40 questions about our apps, or browse them by app.
GeneralWhich phones do your apps work on?
FatForecaster and MultiFlowMomentum work on iPhone. FestivalVibe works on iPhone and Android.
GeneralWhere can I download the apps?
Our apps are coming soon to the App Store, and FestivalVibe also to Google Play. Each app's page will link to its store as soon as it's live. [Update when each app is released.]
GeneralWhat do the apps cost?
[Price per app, and whether there are in-app purchases or subscriptions.]
GeneralDo your apps collect my data?
FatForecaster and MultiFlowMomentum keep everything on your iPhone. We never receive any of it.
FestivalVibe needs an account, so it stores your festival plans on our server in the EU. None of our apps contain analytics, ads or trackers.
The privacy policy lists what each app stores.
GeneralHow do I delete my data?
- FatForecaster and MultiFlowMomentum: delete the app. Nothing is stored anywhere else.
- FestivalVibe: in Settings, tap Delete account. This deletes your account and all your festival data.
GeneralHow do I report a problem or suggest an idea?
Use the contact page. Choose the app and what it's about, and it starts an email with the right questions filled in.
FatForecasterHow and when should I measure my weight and body stats?
Measure the same way every time. The app reads change over time, so you want two readings to differ only because your body changed.
- Weight: weigh every morning, after the toilet and before you eat or drink. Use the same scale on the same hard floor, in the same clothes or none.
- Weigh daily, not weekly. One reading can swing by a kilo or more from water, salt and food. The 7-day trend smooths this out if it has enough readings.
- Waist: stand relaxed and measure on bare skin at navel level, with the tape level with the floor. Keep it snug without denting the skin. Breathe out normally, then read it.
- Neck (Navy method only): measure just below the Adam's apple, with your shoulders relaxed and the tape sloping slightly down at the front.
- Hips (Navy method, when asked): measure at the widest point, with your feet together.
Take each tape measurement two or three times and use the average. With waist-based formulas, one centimetre makes a real difference.
Re-measure your body every 4 to 6 weeks, the same interval as the reminder in Settings. Do it at the time of your morning weigh-in, and not straight after a big meal or a workout.
FatForecasterWhy do I need to log for about two weeks before I get a forecast?
The app compares how your weight changed with what you logged eating over the same days. That's how it tells a real deficit from ordinary day-to-day noise.
Two weeks is about the shortest stretch that gives a reliable signal. With less, a forecast would mostly be a guess, so the app waits.
FatForecasterWhich food should I pick when I can't find my exact product?
Food-logging apps such as MyFitnessPal often don't have your local product. They offer similar items from other brands, or a generic entry.
The lowest-calorie option is tempting. If you always pick it, you under-log what you really eat, and the gap adds up over every meal.
Pick the highest-calorie option that is still plausible. Logging a little too much on an uncertain item affects your numbers far less than a habit of logging too little.
FatForecasterWhat do the numbers on the Dashboard mean?
- Current trend is your trend weight, a 7-day moving average of your logged weight. Every calculation in the app uses it, never a single scale reading.
- Estimated body fat % is not a new measurement. The app works it out from your trend weight and the lean mass from your last re-measurement. It drifts a little between re-measurements and resets when you record a new one.
- Recalibrated TDEE, on the Review tab, is your real average daily burn. The app calculates it from what you logged eating and how your weight changed over the last 14 days. It ignores the burn figures you log.
- Forecast date and the days-remaining range come from your recalibrated TDEE, your trend weight and your target weight. The range narrows as you log more days.
If you eat as much as your recalibrated TDEE or more, there's no deficit to project. The app tells you that instead of guessing a date. If you eat clearly more, it tells you you're moving away from your goal.
FatForecasterHow does the Body fat forecast chart work?
- The solid Logged line is your estimated body fat % on each day you have data.
- The dotted Forecast line carries that pace forward to your target. It curves because your lean mass, and with it your daily burn, slowly goes down as you lose weight.
- The shaded band shows how far the forecast date could move if your consistency changes. It's wider when your logging is less consistent.
- The dashed horizontal line is your target body fat %.
- The Original plan line keeps the first forecast date the app could calculate, so you can see if you're drifting from it. It appears after your first day that counts as a real deficit.
FatForecasterI burn more than I eat on most days. Why does the app say I'm not in a deficit?
The forecast never uses your logged burn to decide whether you're in a deficit. That includes burn from a wearable or the Health app.
It relies on two things it trusts more: what you logged eating, and what your weight did over the same two weeks. If those don't match burn minus intake, the app believes your weight.
Common reasons for the gap:
- Wearables often overestimate burn, especially active calories.
- If you lift weights, you can lose fat while you gain muscle. The scale stays flat while you make progress.
- Food is easy to under-log. Portions are hard to judge, snacks get forgotten and a big weekend adds up.
- Water and glycogen change from day to day. The 7-day trend smooths this but can't remove it.
The app averages 14 days of intake, so one heavy day moves the average more than most people expect. One big weekend can cancel out a careful week.
The Review tab shows the gap directly: your logged burn next to your recalibrated TDEE.
To check your real progress, re-measure your body fat %. It reads your body composition without relying on the scale or a burn estimate.
FatForecasterWhich body-fat method should I use?
The default estimate uses your height, weight and waist. Its formula was fitted against real DEXA scans from a large general-population sample and stayed accurate across many body shapes.
The Navy method, a formula from 1984, uses your neck and waist. It treats neck size as a sign of how muscular you are. That works for a typical build, but it has known blind spots:
- If your waist is large for your weight, the Navy method often underestimates your body fat by a lot.
- A very muscular neck can make it overestimate.
If you've had a DEXA scan, InBody, BodPod or caliper reading, enter that number in New body fat %. A real scan beats any formula.
If an estimate doesn't match what you see in the mirror or in progress photos, trust your eyes. Tape-based methods have this known limit. It doesn't mean anything is wrong with you.
FatForecasterWhat is the lean-mass ratio setting for?
When you lose weight, some of it is usually lean tissue as well as fat. This setting controls how much of the weight you lose counts as fat. That changes the target weight for your target body fat %.
The guide in Settings suggests a starting point from your training frequency, your protein intake and your waist and hip trend if you've measured it. You can also set the ratio yourself.
FatForecasterWhy does a body-fat re-measurement change my whole chart?
A re-measurement corrects your lean-mass baseline. Your weight and calorie history is still valid, but the app now reads it differently.
So the app recalculates every earlier day straight away. Old, outdated estimates don't stay on the chart.
FatForecasterDoes FatForecaster send my data anywhere?
No. There are no accounts and no servers. Everything you enter is stored only on your iPhone, and the app contains no analytics, ads or trackers.
The privacy policy lists everything the app stores.
FatForecasterDo I need to connect the Health app?
No. You can type everything in yourself. If you connect the Health app, FatForecaster reads your weight, calories eaten, protein and calories burned. It never writes to Health.
To stop, open the Health app and go to Sharing › Apps › FatForecaster, or tap Disconnect in the app's Settings.
FatForecasterHow do I back up or delete my data?
To back up, export a backup from Settings. The app hands the file to your share sheet, and you choose where it goes.
To clear your daily logs, tap Erase all logged history in Settings. Deleting the app removes all of its data.
MultiFlowMomentumWhat does MultiFlowMomentum do?
It works out how much free time you really have in a week. Then it helps you plan sessions for your hobbies within that time.
MultiFlowMomentumHow long does the setup take?
The time audit takes about 2 minutes. Choosing your hobbies and planning sessions takes a few minutes more.
MultiFlowMomentumHow does the app work out my free time?
For a weekday and a weekend day, it adds up your fixed commitments: sleep, work, commuting, meals and chores. Whatever is left of the 24 hours is your free time for that day.
It multiplies the weekday by 5 and the weekend day by 2 to get your free hours for the week. Then it keeps back 15% as a buffer.
For example, 5 free hours on a weekday and 9 on a weekend day make 43 hours a week. After the buffer, the app plans with about 36.5 hours.
MultiFlowMomentumWhy does the app keep back 15%?
Weeks rarely go exactly to plan. Errands, tiredness and surprises all take time. A plan that uses every free hour breaks the first time something comes up, so the app leaves room for it.
MultiFlowMomentumCan I change my answers later?
Yes. Tap Adjust Times on the results screen to change your hours. Your free time is recalculated straight away.
MultiFlowMomentumWhich hobbies can I choose?
The app suggests 24 popular hobbies. If yours isn't there, add it in your own words.
MultiFlowMomentumHow do sessions work?
Each hobby gets a number of sessions per week, from 1 to 7, and a length per session, from 15 minutes to 3 hours.
The budget bar at the top shows how many of your weekly hours you've planned and how many are left.
MultiFlowMomentumWhat happens if I plan more time than I have?
The budget bar shows that you're over your realistic hours. Reduce the sessions or their length until the plan fits.
MultiFlowMomentumWhere do I see my plan?
After you save, your plan appears under My Plan, with your hobbies sorted by hours per week.
MultiFlowMomentumDoes MultiFlowMomentum send my data anywhere?
No. There are no accounts and no servers. Your time audit, hobbies and plan are stored only on your iPhone, and the app contains no analytics, ads or trackers.
The privacy policy has the details.
MultiFlowMomentumHow do I delete my data?
Delete the app. That removes everything, because nothing is stored anywhere else.
FestivalVibeDo I need an account?
Yes. An account lets your festivals sync and keeps them safe if you lose your phone.
There's no password. Enter your email address and FestivalVibe sends you a 6-digit code to sign in.
FestivalVibeDoes it work without signal?
Yes. Your festivals, timetables, packing lists and travel plans are saved on your phone and open without a connection. Changes you make offline sync when you're back online.
You need a connection the first time you sign in, and to open a PDF timetable from a festival website.
FestivalVibeWhich devices does it work on?
FestivalVibe works on iPhone and Android. Sign in with the same email address on each device to see the same festivals.
FestivalVibeHow do I import a timetable?
Open a festival day and tap Import timetable. Paste the address of the festival's timetable or line-up page.
FestivalVibe reads the page and lists the artists it finds, with stages and times where the page has them. Check the list, then add the artists you want.
FestivalVibeHow do artist reminders work?
Mark an artist as a favourite and turn on notifications. FestivalVibe reminds you 5 minutes before they play, with the stage name if you've added it.
FestivalVibeCan I keep my tickets in the app?
Yes. Add a ticket as a file, such as a PDF or an image, or as a link. Ticket files are stored privately in your account.
FestivalVibeCan I reuse a packing list?
Yes. Create checklist templates in Settings, then apply one to any festival.
FestivalVibeCan it tell me when to leave?
Yes. For each day, add how you're travelling and when you need to leave. Turn on Notify me and FestivalVibe reminds you when it's time to go.
FestivalVibeWhere is my data stored?
On your phone, for offline use, and in your account on Supabase, our database provider, hosted in the EU. All connections are encrypted.
We don't sell or share your data and the app contains no ads or trackers. The privacy policy lists everything FestivalVibe stores.
FestivalVibeHow do I export my data?
Go to Settings and tap Export my data. You get a file with all your festivals and checklists, which you can import again later.
FestivalVibeHow do I delete my account?
Go to Settings and tap Delete account. This permanently deletes your account and all your festival data.
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