Trajectory vs Just Weight
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Trajectory
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Trajectory focuses on long-term direction instead of daily noise, so you can stay consistent without overreacting. TRACK YOUR WEIGHT EFFORTLESSLY • Log your weight in seconds • Supports kg and lbs • Full history STAY ON COURSE • Set a target weight and deadline • See your personal trajectory line • Know exactly where you should be today UNDERSTAND YOUR BODY • BMI tracking with instant feedback • 7-day trend to spot momentum • Progress toward your goal CLEAN & FOCUSED • No subscriptions. Free. • Beautiful chart that tells the whole story Trajectory doesn't judge. It doesn't nag. It just shows you the path, and whether you're on it.
Just Weight
Easily log your weight with a simple interface and fun wheel picker. Visualize your progress with clear charts and set personalized weight goals with target dates. Securely sync your data to the cloud and switch between units as needed.
- Quick weight logging
- Weight history chart
- Goal plans with progress tracking
- Weekly weigh-in tracking
- lbs and kg support
- Cloud data sync
- Dark mode support
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Just Weight makes weight tracking simple. Logging takes about five seconds. Tap, spin the wheel to your weight, and save. The History tab charts your weight by week, month, or year. If you weigh in on a set day each week, you can show only those days to smooth out daily ups and downs. Working toward a number, whether losing or gaining? Set a plan with a goal and a target date. The Plan tab shows whether you're ahead or behind, and how much change per week it takes to get there. Works in lbs or kg. Entries are backed up to your account, so switching phones doesn't mean starting over.
Screenshots
Verdict
The clearest difference is device support: Just Weight at 2 against Trajectory's —. On price, in-app purchases and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Trajectory | Just Weight |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | — | Daily |
| Ads | — | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | — | iPhone, iPad — better |
| Requires iOS | 18.5 | 17.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 3 MB |
| Age rating | 17+ | 4+ |
| Developer | Mathieu Bonte | Desoto Labs LLC |
In-app purchases
Trajectory
No in-app purchases
Just Weight
No in-app purchases









