# Automa Keychain vs Smart Unit Conversion

The clearest difference is in-app purchases: Automa Keychain at none against Smart Unit Conversion's 1. Automa Keychain also leads on ads (none vs shown). Smart Unit Conversion's advantage is update cadence (every 15 months vs every 46 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Smart Unit Conversion sells 1 in-app purchase, starting at $1.99 per year. Automa Keychain asks for nothing beyond the download.

Automa Keychain ships an update every 46 months, Smart Unit Conversion every 15 months. The most recent releases landed on November 11, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Automa Keychain | Smart Unit Conversion |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 46 months | **Every 15 months** |
| Size | 27 MB | 41 MB |
| Requires iOS | **12.0** | 13.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Automa s.r.l.](https://appshunter.io/developer/824864864) | [Yui Lau](https://appshunter.io/developer/1791465155) |

## What reviewers say

### Automa Keychain

[App page](https://appshunter.io/ios/app/automa-keychain/id1238195862)

**Features:** macOS Compatibility

**In-app purchases:** none


### Smart Unit Conversion

[App page](https://appshunter.io/ios/app/smart-unit-conversion/id1643381985)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Year | $1.99 | per year |


## Frequently asked questions

### Is Automa Keychain free?

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

### Is Smart Unit Conversion free?

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

### Do Automa Keychain or Smart Unit Conversion have ads?

Smart Unit Conversion shows ads; Automa Keychain does not.

### Which is updated more often, Automa Keychain or Smart Unit Conversion?

Automa Keychain ships an update every 46 months, and Smart Unit Conversion every 15 months. Most recently, Automa Keychain was updated on November 11, 2026 and Smart Unit Conversion on November 7, 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.*