# BMI Diary vs Spren Body Composition Scanner

The clearest difference is rating: Spren Body Composition Scanner at 4.7 against BMI Diary's 4.1. Spren Body Composition Scanner also leads on ads (none vs shown) and ratings volume (1.5K vs 7). BMI Diary's advantage is review sentiment (75% vs 46%) and device support (4 vs 1). On price, in-app purchases and monetization model there is nothing between them.

Both are free to download. BMI Diary sells 1 one-off in-app purchase and Spren Body Composition Scanner sells 10 in-app purchases, starting at $10.49 per month. Whichever you choose, the download price is not the number that matters.

Spren Body Composition Scanner holds the better App Store score, 4.7 against 4.1. That said, the two scores are not equally well evidenced: Spren Body Composition Scanner has 1.5K ratings behind it against 7, so its average is the more settled of the two. Written reviews complicate that: 75% of BMI Diary's written reviews are positive against 46% of Spren Body Composition Scanner's, so the app with the better star average is not the one people write more warmly about.

BMI Diary ships an update every 3 weeks, Spren Body Composition Scanner every 9 days. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | BMI Diary | Spren Body Composition Scanner |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (7 ratings)](https://appshunter.io/ios/app/bmi-diary-bmi-calculator/id1521281509/reviews) | **[4.7 (1.5K ratings)](https://appshunter.io/ios/app/spren-body-composition-scanner/id1664503999/reviews)** |
| Number of ratings | 7 | **1.5K** |
| Positive reviews | **75.0% of reviews** | 46.5% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Every 9 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 17 MB | 207 MB |
| Requires iOS | **12.0** | 17 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [APPS BAY LIMITED](https://appshunter.io/developer/1599035519) | [Elite HRV Inc](https://appshunter.io/developer/868829973) |

## What reviewers say

### BMI Diary

[App page](https://appshunter.io/ios/app/bmi-diary-bmi-calculator/id1521281509)

Track your Body Mass Index (BMI) daily to manage weight and health effectively. Visualize your BMI trends in real-time to monitor progress. This tool is ideal for those focused on weight loss or bodybuilding.

**Highlights:** Daily BMI calculation, Save BMI values, Visualize BMI trends, Weight management, Health monitoring

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads forever | $0.99 | one-time |


### Spren Body Composition Scanner

[App page](https://appshunter.io/ios/app/spren-body-composition-scanner/id1664503999)

This app uses your smartphone to measure body fat percentage, BMI, and body composition. It provides detailed health reports, tracks weight loss, and offers personalized nutrition plans, acting as a smart scale alternative with research-grade analysis.

**Highlights:** Body fat percentage measurement, BMI calculator, Body composition analysis, Weight tracking, Personalized nutrition planning, Multi-page PDF reports

**Features:** Apple Wallet, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Scan Essentials | $10.49 | per month |
| Monthly | $14.99 | per month |
| Monthly | $19.99 | per month |
| 24/7 AI coaching support | $20.99 | per month |
| Scan Essentials | $38.99 | per year |
| Quarterly | $59.99 | per 3 months |
| Annual | $69.99 | per year |
| Annual | $119.99 | per year |
| 24/7 AI coaching support | $129.00 | per year |
| Body Composition Analysis | $17.99 | one-time |

**What reviewers like**

- 👍 Easy to operate
- 🚀 Motivating
- 👍 Incredible app
- 👍 Accurate
- 👍 Talks you through the scan

**What reviewers complain about**

- 🐛 No login possible
- 🐛 Doesn't work
- 🐛 Measurements are nowhere close to DEXA scans
- 🐛 Can't delete account
- 🐛 Useless

**Reported bugs**

- No login possible
- Doesn't work
- Measurements are nowhere close to DEXA scans
- Can't delete account
- Useless

**Requested features**

- Integration with Apple Health for weight tracking
- Demo or trial before subscription
- Monthly subscription option


## Frequently asked questions

### Is BMI Diary free?

BMI Diary is free to download, with in-app purchases available.

### Is Spren Body Composition Scanner free?

Spren Body Composition Scanner is free to download, with in-app purchases available.

### Which has better reviews, BMI Diary or Spren Body Composition Scanner?

Spren Body Composition Scanner is rated higher. BMI Diary averages 4.1 out of 5 from 7 ratings, while Spren Body Composition Scanner averages 4.7 from 1.5K ratings.

### Do BMI Diary or Spren Body Composition Scanner have ads?

BMI Diary shows ads; Spren Body Composition Scanner does not.

### Which is updated more often, BMI Diary or Spren Body Composition Scanner?

BMI Diary ships an update every 3 weeks, and Spren Body Composition Scanner every 9 days. Most recently, BMI Diary was updated on November 3, 2026 and Spren Body Composition Scanner on November 7, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*