Co vs WatchBMI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Co
Participate in weekly surveys, polls, and forum discussions to share your opinions and experiences. Earn points for your engagement, redeemable for gift cards. All data is used for research purposes.
- Weekly exercises
- Topics and forums
- Online surveys
- Quick polls
- Earn points
- Redeem for gift cards
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"Welcome to Co-Deo! We are looking forward to engage with you and to hear your thoughts, opinions and experiences. The focus is deodorants but we are also interested in broader more general ideas too. You will have opportunities to participate in new exercises every week including topics/forums, online surveys and quick polls. This app will allow you to access the community on your mobile phone or tablet. You will earn points as a result of your participation in these activities, which can be redeemed for various gift cards. All the data collected will be used for research purposes. We look forward to your participation via our mobile application! "
WatchBMI
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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
Verdict
The clearest difference is price: Co at Free against WatchBMI's $0.99. WatchBMI's advantage is update cadence (daily vs every 2 months). On ads, in-app purchases, device support 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
Co is free to download; WatchBMI costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Co ships an update every 2 months, WatchBMI daily. The most recent releases landed on September 19, 2026 and September 6, 2026 respectively.
| Parameter | Co | WatchBMI |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 3.3 (4 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 2 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 57 MB | 0 MB |
| Age rating | 4+ | 17+ |
| Developer | QuestionPro.com | James Nachbar |
In-app purchases
Co
No in-app purchases
WatchBMI
No in-app purchases









