# Metric Converters vs Lullab

The clearest difference is in-app purchases: Metric Converters at none against Lullab's 2. Metric Converters also leads on iOS requirement (14.1 vs 17). On price, ads and device support there is nothing between them.

Both are free to download. Lullab sells 2 in-app purchases, starting at $2.99 per month. Metric Converters asks for nothing beyond the download.

## The numbers

| Metric | Metric Converters | Lullab |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 38 months | — |
| Size | 20 MB | 3 MB |
| Requires iOS | **14.1** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | +4 | 9+ |
| Developer | [H Valeur](https://appshunter.io/developer/621824042) | [贺 周](https://appshunter.io/developer/1815397078) |

## What reviewers say

### Metric Converters

[App page](https://appshunter.io/ios/app/metric-converters/id1570182170)

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

**In-app purchases:** none


### Lullab

[App page](https://appshunter.io/ios/app/lullab/id6767858675)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lullab Premium Monthly | $2.99 | per month |
| Lullab Premium Yearly | $19.99 | per year |


## Frequently asked questions

### Is Metric Converters free?

Metric Converters is free to download, with no in-app purchases.

### Is Lullab free?

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

### Do Metric Converters or Lullab have ads?

Neither Metric Converters nor Lullab shows ads.

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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.*