Smoothed 7-day curve
ZymFit shows the 7-day moving average by default, not the raw daily number. You see the slope, not the saw-tooth. The daily dot stays visible in the background if you want to check it, but the smoothed curve is what guides you.
Feature · Progress
Progress tracking: see what actually works.
The mirror lies, sensations drift, and the scale reads differently every morning. ZymFit gives you three reliable signals — a smoothed weight curve, body measurements across 13 zones and before/after photos stored locally on your phone — then cross-checks them with your full history so you can connect what you do to what your body does.
Weight
Smoothed 7-day curve
A 7-day moving average trend to ignore daily noise and see the real direction.
Measurements
Up to 13 zones
Waist, biceps, thighs, calves, shoulders — what the scale never tells you (Pro).
Photos
Before/after on device
Private storage on your phone. No photos on our servers. Side-by-side comparison.
History
Long-term + PRs
Unlimited history on Standard and Pro. Personal records detected automatically by exercise.
01The intent
Why track (and not just feel).
Sensations matter, but they drift. A great session can follow a bad week of eating. A « bloated » stomach on a Tuesday might just be salt, not fat. A scale up 1.5 lb on a Monday says nothing about your month. Tracking gives you a stable floor to make decisions — bump calories, add a session, back off, stay the course.
ZymFit doesn't ask you to become an accountant. Weigh in when you can, take a photo once a month, measure when you remember. The data piles up on its own and the trend reveals itself after a few weeks. It's a tracking tool, not a mandatory logbook.
02The scale
Track your weight without obsessing over it.
Today's weight says nothing. The 7-day trend says everything.
Flexible ranges
7 days, 30 days, 3 months, 1 year. Zoom in on the last week to sanity-check consistency, zoom out to a year to see where you stand compared to last winter.
Flexible weigh-ins
You don't need to weigh yourself every day. Three to five weigh-ins per week, in the morning on an empty stomach, are enough to surface a stable trend. Missing a day breaks nothing.
To understand why the moving average is more honest than any single daily number, we wrote a full guide on weight tracking and the true trend covering the effect of water, salt, digestion and cycle. This logic is central for a weight loss goal, but also for a controlled muscle-gain phase where you want to progress without letting things slide.
03The tape
Pro plan
13-zone measurements: the tape sees what the scale doesn't.
When your weight stalls but your clothes fit differently, it's often silent recomposition. The measuring tape makes it visible.
The 13 zones tracked on the Pro plan
Waist
Hips
Chest
Neck
Shoulder width
Left biceps
Right biceps
Left forearm
Right forearm
Left thigh
Right thigh
Left calf
Right calf
Free and Standard plans: subset (waist, hips, biceps, thigh). Pro unlocks all 13 zones plus left/right distinction to track asymmetries.
Each measurement is plotted on its own curve. You can see that in five weeks of a program, your waist dropped half an inch while your thighs gained a quarter inch — a recomposition signal the scale alone would have hidden. This is especially useful during a cutting phase, where the goal is to keep muscle while the waist shrinks.
04The photos
Progress photos, stored locally on your phone.
No cloud. No server. Your photos live on your phone, inside the app's private storage.
Local storage only
Photos stay inside ZymFit's private folder on your device. They're not sent to our servers, not synced, not indexed. It's your phone, they're your photos.
Before/after comparison
Side-by-side mode: two photos next to each other, each tagged with its date and weight. Filter by month and year to quickly find your reference shot.
Free cadence
One photo per week, per month, or only at key milestones. Same framing, same lighting, same outfit if you can — to make the comparison honest six months later.
Direct consequence
Because photos never leave the device, they aren't synced between your devices. If you change phones, export them before migrating or accept starting from a fresh reference shot. It's a trade-off we own — privacy comes before multi-device convenience.
05The history
Long-term history: connecting cause and effect.
A single data point is worthless. A data point cross-checked with ten others becomes an answer.
Unlimited history (Standard and Pro)
On Standard and Pro, your history of workouts, meals, weight and measurements is kept with no time limit. Scroll back to any week, compare your March to last year's, see what you were doing during your last fitness peak. Free plan: 30 days.
Everything cross-checked in one log
Weight, measurements, meals, workouts, loads, PRs — it all lives in the same log and cross-references without effort. You see on a single page the week you added a leg session and your thigh measurement started climbing.
That cross-checking is what lets you adjust intelligently. When weight stalls for two weeks during a cut, you can scroll back through calories, logged sleep, completed sessions — and identify what slipped, rather than cutting blind. It's also that foundation that makes the other ZymFit features more useful — load suggestions, PRs, goal adjustments all lean on this history.
06The PRs
Personal records detected automatically.
You don't have to log your PR. ZymFit sees it, marks it, and pings you the moment you beat it.
Auto-detection
The moment you log a set that beats your best on an exercise — in load, reps or total volume — ZymFit flags it as a personal record and adds it to your history.
Per-exercise history
Every exercise has its own dated PR list. See your bench press progression over the year at a glance, and how many times you've beaten your record in the last three months.
CSV and JSON export (Pro)
On Pro, export your PRs, weight history, measurements and workouts in CSV or JSON. Opens in Excel, Numbers, or any spreadsheet. Your data stays yours.
07The plans
Which plans for what.
Weight tracking and local photos are on every plan. Unlimited history and all 13 measurement zones step up with Standard and Pro.
Free
- Smoothed weight curve
- Basic measurements (waist, hips)
- Local photos
- 30-day history
Standard
Popular- Smoothed weight curve
- Intermediate measurements
- Local photos
- Unlimited history
- Auto personal records
Pro
- Everything in Standard
- 13 measurement zones
- CSV and JSON export
- Advanced photo comparison
Pricing details and the rest of the features are on the full plans and pricing page. Pro unlocks the 13 measurement zones and CSV/JSON export — handy for archiving or analyzing your data outside the app.
Frequently asked questions
What people ask us most often.
Do my photos get uploaded to a server?
No. Progress photos are kept locally on your phone, inside the app's private storage. They are not sent to our servers, not synced across devices, not shared. If you switch phones, remember to export them manually first — it's a deliberate design choice: photos of you never leave your phone.
Why distinguish today's weight from the trend?
Your daily weight swings by 1 to 3 pounds depending on hydration, digestion, your last workout or how salty yesterday's meal was. That's noise, not signal. The trend, calculated as a 7-day moving average, smooths those swings out and shows you the real direction over the month. We've written a full guide on weight trend tracking if you want the logic in depth.
How many measurements can I track?
Thirteen zones on the Pro plan: waist, hips, chest, neck, shoulders, left and right biceps, left and right forearms, left and right thighs, left and right calves. Free and Standard plans offer a smaller subset. Each measurement is dated and plotted on its own history curve.
Can I export my data?
Yes — in CSV or JSON, on the Pro plan. The export covers your weight, measurements, photos (local paths), workouts, meals and personal records. You pick the date range and the format. It stays your data — open it in Excel, Numbers, any spreadsheet, or archive it outside the app.
What happens if I change phones?
Your accountable data (weight, measurements, workouts, meals, PRs) is synced with your ZymFit account, so it comes back as soon as you log in on the new device. Progress photos, however, live locally — export them via the Pro export or copy them manually before migrating. That's the trade-off for keeping photos off our servers.
Does ZymFit measure my body fat percentage?
No. ZymFit does not do body composition analysis. For that you need a dedicated tool (bioimpedance scale, DEXA, skinfold calipers) and the interpretation is still debated. ZymFit tracks what is simply measurable: weight, measurements, photos. Recomposition shows up when you cross-read those three signals — not from a single number on a smart scale.
See also
Around progress tracking.
Nutrition
Meal photo scan
Snap your plate, AI recognizes the foods and computes calories and macros before you confirm.
ExploreTrainingStrength training programs
Push/Pull/Legs, Upper/Lower or Full Body adapted to your equipment, level and goals.
ExploreOverviewAll features
Nutrition, training, progress, organization — the four pillars of ZymFit on a single page.
ExploreSix months go fast. Keep the trail.
Download ZymFit and start tracking your progress tonight. Free plan, no credit card — Pro available whenever you want the 13 zones and the export.