# TMD Lightning warning system vs RIWI

The clearest difference is update cadence: RIWI at every 3 weeks against TMD Lightning warning system's every 2 months. TMD Lightning warning system's advantage is iOS requirement (12.4 vs 15.6). On price, ads, 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.

TMD Lightning warning system ships an update every 2 months, RIWI every 3 weeks. The most recent releases landed on October 16, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | TMD Lightning warning system | RIWI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Size | 101 MB | 55 MB |
| Requires iOS | **12.4** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Thai Meteorological Department](https://appshunter.io/developer/904197426) | [Royal Irrigation Department](https://appshunter.io/developer/1161273398) |

## What reviewers say

### TMD Lightning warning system

[App page](https://appshunter.io/ios/app/tmd-lightning-warning-system/id1510905216)

**Features:** Vision Pro support

**In-app purchases:** none


### RIWI

[App page](https://appshunter.io/ios/app/riwi/id6741211501)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is TMD Lightning warning system free?

TMD Lightning warning system is free to download, with no in-app purchases.

### Is RIWI free?

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

### Do TMD Lightning warning system or RIWI have ads?

Neither TMD Lightning warning system nor RIWI shows ads.

### Which is updated more often, TMD Lightning warning system or RIWI?

TMD Lightning warning system ships an update every 2 months, and RIWI every 3 weeks. Most recently, TMD Lightning warning system was updated on October 16, 2026 and RIWI 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.*