Pay once, own it
One payment of $39. No subscription, ever
A weight loss tracker you pay for once
See your real progress, not daily scale noise. Track your trend weight, goal date, habits, body measurements, progress photos and GLP-1 doses in one private app. No subscription and no account. It works offline on your own device.
$39 once. No subscription.
Why people choose Storm Weight
Private by design
Your weight, measurements and photos never leave your device. No ads, no tracking, no cloud
Works offline in your browser
Works offline. Open it in Chrome, Edge, Safari or Firefox
Try it with demo data
Comes with demo data, so you can explore every feature first
Everything in one app
Trend weight, goal forecast, habits, measurements, photos and an optional GLP-1 log in one private app.
Weight and Goals
- True-trend weight that filters out water-weight swings
- Weekly pace and a goal date forecast from your real progress
- Goal progress, BMI and new lowest weigh-in alerts
- Pounds or kilograms, inches or centimetres
Daily Log and Habits
- Water, steps, sleep, calories and protein on one page
- Custom habits that tick themselves when you hit your targets
- Mood, energy and hunger check-ins, plus a private journal
- Streaks and a habit consistency heatmap
Body and Photos
- Waist, hips, chest, neck, arm, thigh, belly and calf
- Body fat estimate, lean mass and fat mass
- Progress photos with a before and after slider
Insights and Reports
- Weekly summaries and day-of-week patterns
- Adaptive calorie burn that learns your real metabolism
- A printable PDF progress report and CSV export
More
- An optional GLP-1 and medication log with site rotation
- Milestones and non-scale victories
- Multiple profiles for partners, family or coaching clients
- A guided 60-second setup with suggested calorie and protein targets
Real progress, not scale noise
Every weigh-in next to your smoothed trend, so water and salt swings stop ruining your week.
- Trend weight. Filters out daily bounces.
- Import. Weigh-ins from a smart scale or another app (CSV).
Know when you will get there
A goal date forecast from your real pace, weekly change and an adaptive calorie burn that learns your metabolism.
- PDF progress report. For your doctor or coach.
- CSV export. For Excel or Google Sheets.
Measure more than weight
Eight measurement sites, with body fat, lean mass and fat mass estimates from the US Navy tape method.
- Start versus latest. For every site.
- Trends. For each measurement.
See the change the mirror misses
Progress photos with a before and after comparison slider, stored only on your device.
- Compare. Any two dates side by side.
- Private. Photos are never uploaded.
An optional GLP-1 log
Dose log with next-dose dates, injection site rotation and a dose versus weight chart.
- Site rotation. Suggests your next site.
- Switch it off. In one click if you don't need it.
Pay once, not every month
Own your software. No renewals, no price rises and no lock-out.
Weight loss app subscriptions
Every month another fee
- Pay again every month or year
- Your body data and photos live online
- Ads and upsells
- Locked out when you stop paying
Storm Weight
$39 once
- Unlimited weigh-ins and photos
- No subscription, ever
- Your data never leaves your device
- Works without internet
Storm Weight is a personal tracking tool, not medical advice or a medical device.
Security and backups
Optional PIN lock
One-click backup and restore
Light and dark mode
How it works
Download the files after purchase
Double-click to open the app in your browser
Follow the 1-minute setup and log your first weigh-in
Frequently asked questions
Do I need to install anything?
The Storm Weight file (HTML), a START HERE guide and a ReadMe, delivered instantly. There is nothing to install and no sign-up.
Does it sync between devices?
Data is saved in the browser on the device you use. It does not sync between devices. Back up weekly, and use the built-in backup to move between devices or browsers.
What does it run on?
Works on Windows, Mac and Chromebook in Chrome, Edge, Safari or Firefox. It also opens on iPhone, iPad and Android.
Is there a subscription?
No. You pay $39 once and the app is yours to keep. There are no monthly fees and no online account.
I own the earlier version. Will my data carry over?
Storm Weight imports your old data in one click, so you keep every weigh-in, measurement and note.
Can I get a refund?
Because it is a digital download, returns aren't accepted. Message us with any questions before or after you buy.
Anything else I should know?
Storm Weight is a personal tracking tool, not medical advice or a medical device. Calorie, BMI and body fat figures are estimates. Speak to a healthcare professional before changing your diet, exercise or medication.
See your real progress with Storm Weight
$39 once. No subscription.