# NIH BMI Calculator vs BMI Calculator・Weight Tracker The clearest difference is review sentiment: BMI Calculator・Weight Tracker at 84% against NIH BMI Calculator's 31%. BMI Calculator・Weight Tracker also leads on rating (4.8 vs 2.9) and update cadence (every 2 months vs every 30 months). NIH BMI Calculator's advantage is in-app purchases (none vs 5) and iOS requirement (7.0 vs 14.0). On price, ads and device support there is nothing between them. Both are free to download. BMI Calculator・Weight Tracker sells 5 in-app purchases, starting at $9.99 per month. NIH BMI Calculator asks for nothing beyond the download. BMI Calculator・Weight Tracker holds the better App Store score, 4.8 against 2.9. That said, the two scores are not equally well evidenced: BMI Calculator・Weight Tracker has 517 ratings behind it against 52, so its average is the more settled of the two. Written reviews point the same way: 31% of NIH BMI Calculator's written reviews are positive against 84% of BMI Calculator・Weight Tracker's. NIH BMI Calculator ships an update every 30 months, BMI Calculator・Weight Tracker every 2 months. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively. ## The numbers | Metric | NIH BMI Calculator | BMI Calculator・Weight Tracker | | --- | --- | --- | | Price | Free | Free | | Rating | [2.9 (52 ratings)](https://appshunter.io/ios/app/nih-bmi-calculator/id446441346/reviews) | **[4.8 (517 ratings)](https://appshunter.io/ios/app/bmi-calculatorweight-tracker/id1560499972/reviews)** | | Number of ratings | 52 | **517** | | Positive reviews | 30.7% of reviews | **84.0% of reviews** | | In-app purchases | **No** | Yes | | Ads | No | No | | Update frequency | Every 30 months | **Every 2 months** | | Monetization | **Free** | Freemium | | Size | 16 MB | 53 MB | | Requires iOS | **7.0** | 14.0 | | Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch | | Age rating | 4+ | 17+ | | Developer | [The National Heart Lung and Blood Institute](https://appshunter.io/developer/446441350) | [AboutMe Apps, Inc.](https://appshunter.io/developer/1088980079) | ## What reviewers say ### NIH BMI Calculator [App page](https://appshunter.io/ios/app/nih-bmi-calculator/id446441346) This tool helps screen for weight categories that may indicate potential health problems. It provides a fully functioning Body Mass Index calculator directly on your phone, along with access to valuable health resources. **Highlights:** Body Mass Index calculation, Weight category screening, Access to NHLBI health resources, Downloadable phone application **Features:** macOS Compatibility **In-app purchases:** none **What reviewers like** - 👍 Simple and straightforward - ✅ Calculates BMI correctly - 🔗 Links to helpful information - 🚫 No ads - 💯 Works as intended (when functional) **What reviewers complain about** - ❌ Cannot key decimal points - ❌ Unusable in metric mode - ❌ App crashes/won't open - ❌ Outdated and not maintained - ❌ Ignores physical fitness/gender **Reported bugs** - App crashes immediately on launch - App does not open - Input fields non-responsive on active call - App closes before loading - App no longer works with latest iOS updates **Requested features** - Add decimal point input for weight - Allow recording of daily weight and view as a graph - Include gender input for BMI calculation - Add option for recording daily exercise - Add option for tallying fruit/vegetable intake ### BMI Calculator・Weight Tracker [App page](https://appshunter.io/ios/app/bmi-calculatorweight-tracker/id1560499972) Easily calculate your Body Mass Index (BMI) and track your weight progress. Visualize your trends with graphs, gain predictive insights, and set goals for your health journey. Supports metric and imperial systems, with Apple Watch integration. **Highlights:** BMI Calculation, Weight Tracking, Metric and Imperial Systems, Apple Watch Integration, Graphs and Stats, Predictive Insights **Features:** macOS Compatibility, Apple Watch app, Vision Pro support **In-app purchases (5)** | Purchase | Price | Billing | | --- | --- | --- | | Monitor your weight & progress | $9.99 | per month | | Monthly Premium | $9.99 | per month | | Predict your future weight＋BMI | $19.99 | per year | | Premium Year | $19.99 | per year | | Premium 3 Months | $19.99 | per 3 months | **What reviewers like** - 👍 Simple and easy-to-use interface - 📊 Effective weight tracking and logging - 🎨 Aesthetically pleasing design - ⚡ Quick daily input process - 🏥 Integrates with Apple Health **What reviewers complain about** - 🐛 App crashes after recent updates - 🐛 App won't open on iOS 17.5.1 - 😔 Potentially negative psychological impact with BMI labels - 🎨 Loss of color customization options **Reported bugs** - App stopped working after June 2024 update - Crashes on iPad Air (5th Generation) with iOS 17.5.1 - Unable to open app on latest iOS versions - App fails to launch after recent updates **Requested features** - Restore different color options for tracking - More sensitive language for BMI categorization ## Frequently asked questions ### Is NIH BMI Calculator free? NIH BMI Calculator is free to download, with no in-app purchases. ### Is BMI Calculator・Weight Tracker free? BMI Calculator・Weight Tracker is free to download, with in-app purchases available. ### Which has better reviews, NIH BMI Calculator or BMI Calculator・Weight Tracker? BMI Calculator・Weight Tracker is rated higher. NIH BMI Calculator averages 2.9 out of 5 from 52 ratings, while BMI Calculator・Weight Tracker averages 4.8 from 517 ratings. ### Do NIH BMI Calculator or BMI Calculator・Weight Tracker have ads? Neither NIH BMI Calculator nor BMI Calculator・Weight Tracker shows ads. ### Which is updated more often, NIH BMI Calculator or BMI Calculator・Weight Tracker? NIH BMI Calculator ships an update every 30 months, and BMI Calculator・Weight Tracker every 2 months. Most recently, NIH BMI Calculator was updated on November 6, 2026 and BMI Calculator・Weight Tracker on November 7, 2026. --- *Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*