# Convertly vs Plain Units

The clearest difference is in-app purchases: Convertly at none against Plain Units's 1. Convertly also leads on ads (none vs shown). Plain Units's advantage is update cadence (every 3 weeks vs every 5 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Plain Units sells 1 one-off in-app purchase. Convertly asks for nothing beyond the download.

Convertly ships an update every 5 months, Plain Units every 3 weeks. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Convertly | Plain Units |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Size | 2 MB | 48 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Dt nova](https://appshunter.io/developer/1885201641) | [Nicolaus Lawson](https://appshunter.io/developer/1029201825) |

## What reviewers say

### Convertly

[App page](https://appshunter.io/ios/app/convertly-unit-converter/id6761712654)

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

**In-app purchases:** none


### Plain Units

[App page](https://appshunter.io/ios/app/plain-units-unit-converter/id6810955046)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $3.99 | one-time |


## Frequently asked questions

### Is Convertly free?

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

### Is Plain Units free?

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

### Do Convertly or Plain Units have ads?

Plain Units shows ads; Convertly does not.

### Which is updated more often, Convertly or Plain Units?

Convertly ships an update every 5 months, and Plain Units every 3 weeks. Most recently, Convertly was updated on October 25, 2026 and Plain Units on October 31, 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.*