# BMI calculator vs Simby

The clearest difference is update cadence: Simby at every 3 weeks against BMI calculator's every 6 weeks. Simby also leads on iOS requirement (15.1 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. BMI calculator sells 2 in-app purchases, starting at $0.99 per 7 days and Simby sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

BMI calculator ships an update every 6 weeks, Simby every 3 weeks. The most recent releases landed on October 2, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | BMI calculator | Simby |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Size | 28 MB | 68 MB |
| Requires iOS | 26.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Jeronimo Landauer](https://appshunter.io/developer/1803922448) | [VESELA NIKOLAEVA MARINOVA](https://appshunter.io/developer/6786623623) |

## What reviewers say

### BMI calculator

[App page](https://appshunter.io/ios/app/bmi-calculator-weightnote/id6754455726)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Access | $0.99 | per 7 days |
| Yearly Access | $14.99 | per year |


### Simby

[App page](https://appshunter.io/ios/app/simby/id6786623621)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Simby Premium Monthly | $4.99 | per month |
| Simby Premium Annual | $39.99 | per year |


## Frequently asked questions

### Is BMI calculator free?

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

### Is Simby free?

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

### Do BMI calculator or Simby have ads?

Neither BMI calculator nor Simby shows ads.

### Which is updated more often, BMI calculator or Simby?

BMI calculator ships an update every 6 weeks, and Simby every 3 weeks. Most recently, BMI calculator was updated on October 2, 2026 and Simby on October 10, 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.*