# Wei Mail vs Unit Converter

The clearest difference is in-app purchases: Wei Mail at none against Unit Converter's 1. Wei Mail also leads on ads (none vs shown) and device support (3 vs 1). Unit Converter's advantage is update cadence (daily vs every 4 months). On price there is nothing between them.

Both are free to download. Unit Converter sells 1 one-off in-app purchase. Wei Mail asks for nothing beyond the download.

Wei Mail ships an update every 4 months, Unit Converter daily. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Wei Mail | Unit Converter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Daily** |
| Size | 104 MB | 44 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [论客科技(广州)有限公司](https://appshunter.io/developer/1509174199) | [Vasilii Polovnikov](https://appshunter.io/developer/1716165883) |

## What reviewers say

### Wei Mail

[App page](https://appshunter.io/ios/app/wei-mail/id1463498446)

**Features:** Apple Watch app, Vision Pro support

**In-app purchases:** none


### Unit Converter

[App page](https://appshunter.io/ios/app/unit-converter-length-weight/id6772571131)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium · Lifetime | $7.99 | one-time |


## Frequently asked questions

### Is Wei Mail free?

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

### Is Unit Converter free?

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

### Do Wei Mail or Unit Converter have ads?

Unit Converter shows ads; Wei Mail does not.

### Which is updated more often, Wei Mail or Unit Converter?

Wei Mail ships an update every 4 months, and Unit Converter daily. Most recently, Wei Mail was updated on November 3, 2026 and Unit Converter 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.*