The GLP-1 companion
Your side effects
aren't random.
They follow your dose.
Feelforecast turns your GLP-1 medication's weekly rhythm into a 7-day feel-forecast — so tough days never blindside you — and coaches the protein and training that keep the weight you lose as fat, not muscle.
iPhone · Semaglutide, tirzepatide & more · Private by design
Trackers log what already happened.
Feelforecast tells you what's coming.
Reminder apps are a calendar for your shot. Spreadsheets are a graveyard for your data. Neither answers the only question that matters at 11pm: how am I going to feel tomorrow — and is the weight I'm losing the right kind? Feelforecast is built for exactly that.
See your week
Know your tough days before they arrive
GLP-1 side effects aren't random — they rise and fall with the medication in your system. Feelforecast models your personal concentration curve and turns it into a 7-day forecast: which days will feel smooth, which deserve smaller, blander meals, and when your strongest training window opens.
Keep your muscle
Lose fat — not the muscle underneath
A large share of GLP-1 weight loss can be lean mass. Feelforecast sets a daily protein target sized to your goal weight, gives you three 20-minute resistance sessions a week, and rolls it into a weekly retention score — one number that tells you the weight you're losing is the right kind.
Never miss a shot
Every shot, on time and on rotation
Smart shot-day reminders, prep-day nudges, and an 8-zone body map that remembers where you injected last and suggests the next site. A titration timeline is built in — so dose changes are logged, never guessed.
Watch it work
Proof you can see — and share
A smoothed weight trend with your goal line, symptom patterns learned from your own logs, and milestone cards worth sharing. Apple Health syncs your weight both ways; nothing else leaves your phone.
Four phases, every cycle
The same rhythm, color-coded so you can plan around it
Rising
levels climbing
Peak
go bland, hydrate
Falling
best training window
Trough
hunger may return
Inside the app
Ninety seconds to your first forecast
Private by design
Your health data never leaves your phone
No accounts. No servers. No ads. The most personal app on your phone should also be the most private.
On your device
Your medication plan, symptoms, weight and notes live in SwiftData and your private iCloud. We run no servers and can't read any of it.
No ads, no tracking
Zero third-party analytics SDKs. Nothing about your health is sold, shared, or used to target you — ever.
Yours to take
Export everything to CSV or delete it all — including synced iCloud records — from Settings, any time.
Questions
Everything you were about to ask
What does Feelforecast actually predict?+
It estimates how the medication in your system rises and falls across the week and maps that to a plain-language daily forecast — likely-smooth days, tougher days, and your best window to train. It's an educational estimate from published pharmacology, not a medical prediction, and it never suggests dose changes.
Which medications does it support?+
Semaglutide (Ozempic, Wegovy, and the oral form / Rybelsus), tirzepatide (Zepbound, Mounjaro), liraglutide (Saxenda, Victoza), and retatrutide. Compounded users pick the base medication.
How is this different from a shot-reminder app?+
Reminder apps log what already happened. Feelforecast forecasts what's coming and pairs it with a muscle-retention coach — a daily protein target, a short weekly training plan, and a retention score — so you protect lean mass while you lose fat.
Is my health data private?+
Yes. Everything stays on your device and in your private iCloud database. There are no servers, no third-party analytics, and no ads. You can export or delete all of your data from Settings at any time.
Does it work if my dose is changing?+
Yes — you log your titration steps and the forecast adjusts. Feelforecast never recommends starting, stopping, or changing a dose; that's between you and your prescriber.
How much does it cost?+
The basics — today's curve, shot and weight logging, reminders and guidance articles — are free. Premium ($49.99/year, with a 7-day free trial) unlocks the full 7-day forecast, the muscle-retention coach, symptom insights, and share cards.
Know how you'll feel.
Keep your muscle.
See your first 7-day feel-forecast in about ninety seconds — free.
Free to start · $49.99/yr for Premium · 7-day trial