# BMI Calculator vs Retainer Timer

The clearest difference is rating: BMI Calculator at 4.5 against Retainer Timer's 1.0. BMI Calculator also leads on ratings volume (30K vs 2). Retainer Timer's advantage is in-app purchases (none vs 1) and iOS requirement (11.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. BMI Calculator sells 1 one-off in-app purchase. Retainer Timer asks for nothing beyond the download.

BMI Calculator holds the better App Store score, 4.5 against 1.0. That said, the two scores are not equally well evidenced: BMI Calculator has 30K ratings behind it against 2, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on November 9, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | BMI Calculator | Retainer Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (30K ratings)](https://appshunter.io/ios/app/bmi-calculator-weight-loss/id666822519/reviews)** | [1.0 (2 ratings)](https://appshunter.io/ios/app/retainer-timer/id1411887449/reviews) |
| Number of ratings | **30K** | 2 |
| Positive reviews | 47.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Monetization | Free with in-app purchases | **Free** |
| Size | 19 MB | 42 MB |
| Requires iOS | 17.0 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [Steffen Mayer](https://appshunter.io/developer/666822522) | [Lachlan Maxwell](https://appshunter.io/developer/1411887448) |

## What reviewers say

### BMI Calculator

[App page](https://appshunter.io/ios/app/bmi-calculator-weight-loss/id666822519)

Calculate and track your Body Mass Index (BMI) with this user-friendly app. It provides personalized health insights, ideal weight recommendations, and supports various units and classification systems. Monitor your weight journey and understand health risks.

**Highlights:** Instant BMI calculation with animated gauge, Personalized health insights, Ideal weight recommendations, Metric and imperial unit support, WHO and DGE classification systems, Age and gender-specific calculations, Offline functionality

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |

**What reviewers like**

- 🚀 Easy to use
- 📊 Helps track progress
- 💪 Motivates weight loss

**What reviewers complain about**

- 🤕 Can cause insecurity
- 🚫 Inaccurate BMI calculations
- 🚨 Promotes unhealthy behaviors

**Reported bugs**

- Classifies healthy weights as overweight
- Inconsistent results across devices

**Requested features**

- More accurate BMI calculations
- Customizable weight goals
- Consideration for muscle mass


### Retainer Timer

[App page](https://appshunter.io/ios/app/retainer-timer/id1411887449)

This app helps users remember to put in their dental retainers or clear aligners after eating. It provides notifications and tracks daily statistics for wear time, with cloud storage for seamless device switching.

**Highlights:** Wear time reminders, Daily statistics, Cloud data storage, Device switching, Progress tracking

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is BMI Calculator free?

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

### Is Retainer Timer free?

Retainer Timer is free to download, with no in-app purchases.

### Which has better reviews, BMI Calculator or Retainer Timer?

BMI Calculator is rated higher. BMI Calculator averages 4.5 out of 5 from 30K ratings, while Retainer Timer averages 1.0 from 2 ratings.

### Do BMI Calculator or Retainer Timer have ads?

Neither BMI Calculator nor Retainer Timer shows ads.

### Which is updated more often, BMI Calculator or Retainer Timer?

BMI Calculator ships an update fortnightly, and Retainer Timer fortnightly. Most recently, BMI Calculator was updated on November 9, 2026 and Retainer Timer on November 2, 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.*