Comparison

Spark vs WatchBMI

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Spark

This offline calorie tracker helps you monitor your daily food intake and body measurements. It features a built-in Russian food database and allows for custom food entries. Sync your progress with Apple Health for a comprehensive overview of your health journey.

Highlights
  • Offline calorie tracking
  • Built-in Russian food database
  • Log meals by time
  • Track body measurements
  • Add custom foods
  • Sync with Apple Health
Features
Read full description

"Spark: Calorie Counter" — a simple and easy-to-use calorie tracker with Russian language support. The app comes with a built-in food database in Russian and works completely offline. All your data is stored locally on your device, so you can use the calorie counter anywhere — in the countryside, at a summer house, or while traveling — without an internet connection. Key Features: Track daily calorie intake with the option to log meals by time; Keep a log of chest, waist, and hip measurements; Automatically calculate average measurements over time; Add custom foods to the database; Sync weight, calories, macros, water intake, and waist measurements with the Apple Health app. Integration can be enabled or disabled in the settings. If you have any questions, feedback, or suggestions, please leave them at: http://ioscaloriecounter.blogspot.ru/

About

WatchBMI

Features
Read full description

This app is a BMI (Body Mass Index) calculator. It is very simple, in that it asks for input of height and weight, and displays the calculated value for BMI. It does not measure anything; it only displays the calculated BMI based on entered values. I created this for my own practice, because I often need to calculate BMI, and do not want to have to take out and unlock my phone every time. While it will certainly work for an individual to determine her own BMI, it is targeted at users (such as myself) who need to calculate BMI based on the measurements of multiple individuals. It does report the CDC category of the BMI, but does not otherwise interpret any of the data. It does not store or collect any of the entered information. You should know that BMI is only a reflection of height and weight; it does not assess body composition, or differentiate between fat and muscle. Instructions: Simply click on one of the buttons on the main screen to show a keyboard for entering the value. WatchBMI can accept values in either the Metric or the Imperial system. Click the "M" button to change to metric, click the "I" button to change to imperial If Imperial: Click on "Pounds" to enter the weight in pounds. Use the "Back" button to go back to the main screen. Click on "Feet" to enter the feet part of height. Click on "Inches" to enter the inches part of height. If Metric: Click on "Kilos:" to enter the weight in kilograms. Click on "Cms: to enter the height in centimeters. The app does not allow inches greater than 11, feet greater than 7, or weight greater than 999, with similar maximums in metric. Once all three values have been entered, the main screen (again, click the "Back" button) to show the calculated BMI and the CDC category for that BMI. When changing from Imperial to Metric or Metric to Imperial, the height and weight will change as well, so you can enter weight in kilograms and height in feet and inches. Reference Information: Information from the U.S. Centers for Disease Control and Prevention (CDC) provides information about BMI and its appropriate use at https://cdc.gov/bmi BMI is a measure of weight relative to height. According to CDC at https://www.cdc.gov/bmi/about/index.html : BMI is a quick, low-cost, and reliable screening measure for underweight, overweight, or obesity; BMI is a valuable population health measure used worldwide; for individuals, BMI should be considered with other factors, such as blood pressure, cholesterol levels, and physical examination. The CDC Adult BMI Categories are from https://www.cdc.gov/bmi/adult-calculator/bmi-categories.html. BMI and this app does not diagnose or treat any condition. The CDC BMI Categories calculated by this app are designed for adults 20 and older, and do not apply to children. Check with your doctor before using this app or making any medical decisions based on BMI.

Screenshots

Spark4 screens

Verdict

The call

The clearest difference is price: Spark at Free against WatchBMI's $0.99. WatchBMI's advantage is in-app purchases (none vs 1) and update cadence (daily vs monthly). On ads and device support 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

CostPrice · In-app purchases · Ads · Monetization

Spark is free to download; WatchBMI costs $0.99 up front. Spark sells 1 one-off in-app purchase. WatchBMI asks for nothing beyond the download.

UpkeepUpdate frequency

Spark ships an update monthly, WatchBMI daily. The most recent releases landed on October 14, 2026 and October 27, 2026 respectively.

Scorecard4 real differences · 6 level
Spark versus WatchBMI: the parameters behind the verdict, then further details
ParameterSparkWatchBMI
PriceFree — better$0.99
Rating3.0 (3 ratings) — better—
Positive reviews69.4% of reviews—
Number of ratings3 — better—
Update frequencyMonthlyDaily — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPod, Apple Watch
Requires iOS15.613.0 — better
Further details — not scored
Size38 MB0 MB
Age rating4+17+
DeveloperDmitri MarfinJames Nachbar

In-app purchases

1 purchases

Spark

One-time1
  • Awesome calorie counter No Ads$3.99
None

WatchBMI

No in-app purchases

Questions

Is Spark free?
Spark is free to download, with in-app purchases available.
Is WatchBMI free?
WatchBMI costs $0.99, with no in-app purchases.
Do Spark or WatchBMI have ads?
Neither Spark nor WatchBMI shows ads.
Which is updated more often, Spark or WatchBMI?
Spark ships an update monthly, and WatchBMI daily. Most recently, Spark was updated on October 14, 2026 and WatchBMI on October 27, 2026.

Other comparisons