# aiwan 3+3 Postal Code vs Fire Alarm

The clearest difference is ads: Fire Alarm at none against aiwan 3+3 Postal Code's shown. Fire Alarm also leads on update cadence (every 8 months vs every 37 months) and iOS requirement (11.0 vs 13.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

aiwan 3+3 Postal Code ships an update every 37 months, Fire Alarm every 8 months. The most recent releases landed on October 2, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | aiwan 3+3 Postal Code | Fire Alarm |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 37 months | **Every 8 months** |
| Size | 28 MB | 45 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Chengchung Chiu](https://appshunter.io/developer/1359094944) | [詮能資訊股份有限公司](https://appshunter.io/developer/1193118149) |

## What reviewers say

### aiwan 3+3 Postal Code

[App page](https://appshunter.io/ios/app/aiwan-3-plus-3-postal-code/id1524433635)

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

**In-app purchases:** none


### Fire Alarm

[App page](https://appshunter.io/ios/app/fire-alarm/id1589192076)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is aiwan 3+3 Postal Code free?

aiwan 3+3 Postal Code is free to download, with no in-app purchases.

### Is Fire Alarm free?

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

### Do aiwan 3+3 Postal Code or Fire Alarm have ads?

aiwan 3+3 Postal Code shows ads; Fire Alarm does not.

### Which is updated more often, aiwan 3+3 Postal Code or Fire Alarm?

aiwan 3+3 Postal Code ships an update every 37 months, and Fire Alarm every 8 months. Most recently, aiwan 3+3 Postal Code was updated on October 2, 2026 and Fire Alarm on October 1, 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.*