A similar start.
A different follow-through.
About two-thirds of each group logged a meal at least once: 67.5% with a linked scale and 66.0% with the app only. The clearer difference was in continued tracking. From the second week onward, the scale-linked group had a higher weekly logging rate.
Who kept logging?
Share of eligible accounts logging a meal each week
Only users already signed up are included in each week. These are calendar-week rates, not fixed-duration retention rates.
By the final full week, 27.6% of scale-linked users logged a meal, compared with 12.9% of app-only users.
More of their days
included tracking.
Among people who logged at least once, the median share of days with a meal entry was 14.0% for scale-linked users, versus 5.9% for app-only users — around 240% as high.
A more consistent tracking habit
Median share of days since signup with a meal logged
Among users who logged at least once. Across all eligible accounts, including those who never logged, the medians were 5.3% and 2.7%.
The signal is consistency: scale-linked users returned to their food diary on a greater share of their available days.
DESIGNED FOR EVERYDAY USE
Make tracking
part of the meal.
Qalzy combines food weighing and AI recognition in one kitchen scale, bringing food tracking into the moment you prepare your plate.
See how Qalzy worksGreater weight loss
in the scale-linked group.
Among users with qualifying weight readings, median loss was 0.83% of starting body weight with a linked scale, compared with 0.56% without. Average loss was also greater.
How much weight did users lose?
Loss as a percentage of starting body weight
60 scale-linked users and 378 app-only users with two weight readings at least 14 days apart. Positive values represent weight lost. These are measured users, not all accounts.
More reached 3% loss.
Fewer gained weight.
The comparison also favoured scale-linked users at the 3% weight-loss milestone. Weight gain of at least 0.5% was less common in that group.
Lost at least 3%
Share of measured users
6.1 percentage points more
Gained at least 0.5%
Share of measured users
7.1 percentage points fewer
Same weight-analysis sample: 60 scale-linked and 378 app-only users. Both charts use the same 0–40% scale.
THE TAKEAWAY
A stronger habit.
An encouraging direction.
More consistent logging and favourable weight outcomes point to the potential of scale-linked tracking for weight management. The strongest finding is sustained engagement — and that is an important part of the Qalzy story.
THE DETAILS BEHIND THE NUMBERS
About the study
An observational analysis of Qalzy account data from 9 August to 9 October 2026. Tracking and weight were measured in separate samples; the findings describe associations rather than causal effects.
Who was included?
“Scale-linked” means a scale ID was stored on the account. “App-only” means no scale ID was stored. Subscription status was ignored; disabled accounts and staff were excluded.
Logging included 351 scale-linked and 3,712 app-only accounts created during the study window. Weekly denominators included only users already signed up.
The weight results featured here cover accounts created before 9 August, so both groups had access to the full two-month window. Of 541 scale-linked and 90,751 app-only accounts, 60 and 378 respectively had qualifying weight readings.
How were tracking and weight loss measured?
A logging day was a UTC day with at least one user-entered meal; automatic repeats were excluded. Day-to-day consistency is the median share of days since signup with logging, among users who logged at least once.
Weight change was the difference between the first and last recorded weight, divided by starting weight. Readings had to be at least 14 days apart. Same-day readings used the median; readings outside 35–250 kg were removed. Five accounts in the featured weight sample were excluded for later jumps above 15 kg.
The 49% and 67% figures are relative differences reported by the source. The absolute differences in median and mean loss are 0.27 and 0.65 percentage points respectively. Losses are shown as positive magnitudes.
View the chart data and sources
Weekly meal logging
| Week starting | Scale-linked | App-only |
|---|---|---|
| 9 Aug | 59.3% (59) | 63.4% (505) |
| 16 Aug | 47.6% (105) | 45.2% (1,028) |
| 23 Aug | 37.9% (145) | 33% (1,510) |
| 30 Aug | 33.7% (172) | 23.6% (1,945) |
| 6 Sep | 30% (207) | 21.3% (2,399) |
| 13 Sep | 28.7% (230) | 17.8% (2,777) |
| 20 Sep | 29.4% (279) | 15.1% (3,136) |
| 27 Sep | 27.6% (326) | 12.9% (3,434) |
Source: Nutrio, Paired scale: meal logging and weight change, 9 Aug – 9 Oct 2026, pp. 1–5. Data sources: users, diary_entries and diary_biometrics.
Read the original analysis (PDF) · Download the two-page brief
Product photography, logo and product description: Qalzy. Photography illustrates the Qalzy product experience.