# DOH Central Lab vs Convert Rai

The clearest difference is price: DOH Central Lab at Free against Convert Rai's $0.99. DOH Central Lab also leads on iOS requirement (11.0 vs 13.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

DOH Central Lab is free to download; Convert Rai costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

DOH Central Lab ships an update every 5 weeks, Convert Rai every 4 weeks. The most recent releases landed on October 10, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | DOH Central Lab | Convert Rai |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 4 weeks** |
| Size | 34 MB | 17 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [The Department of Highways, Thailand](https://appshunter.io/developer/1125869830) | [Khanin Chomphusri](https://appshunter.io/developer/1657583243) |

## What reviewers say

### DOH Central Lab

[App page](https://appshunter.io/ios/app/doh-central-lab/id1633581751)

**Features:** macOS Compatibility

**In-app purchases:** none


### Convert Rai

[App page](https://appshunter.io/ios/app/convert-rai/id6444877065)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DOH Central Lab free?

DOH Central Lab is free to download, with no in-app purchases.

### Is Convert Rai free?

Convert Rai costs $0.99, with no in-app purchases.

### Do DOH Central Lab or Convert Rai have ads?

Neither DOH Central Lab nor Convert Rai shows ads.

### Which is updated more often, DOH Central Lab or Convert Rai?

DOH Central Lab ships an update every 5 weeks, and Convert Rai every 4 weeks. Most recently, DOH Central Lab was updated on October 10, 2026 and Convert Rai on October 2, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*