# iCalvinus vs Rio Doce Alerta

The clearest difference is update cadence: iCalvinus at every 3 days against Rio Doce Alerta's every 2 weeks. iCalvinus also leads on iOS requirement (12.0 vs 15.0). 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.

iCalvinus ships an update every 3 days, Rio Doce Alerta every 2 weeks. The most recent releases landed on October 30, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | iCalvinus | Rio Doce Alerta |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rio-doce-alerta/id1660761417/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 2 weeks |
| Monetization | — | Free |
| Size | 58 MB | 24 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Dzigne Sistemas e Tecnologia LTDA ME](https://appshunter.io/developer/650792218) | [Prefeitura Municipal de Governador Valadares](https://appshunter.io/developer/1639407467) |

## What reviewers say

### iCalvinus

[App page](https://appshunter.io/ios/app/icalvinus-scipb/id1612910020)

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

**In-app purchases:** none


### Rio Doce Alerta

[App page](https://appshunter.io/ios/app/rio-doce-alerta/id1660761417)

Stay informed about the Doce River's water levels and rainfall in the region. Receive timely updates from Civil Defense regarding the rainy season and potential flooding.

**Highlights:** Real-time river level measurements, Rainfall information, Flood alert levels, Historical flood data, Useful contact numbers, Informative links

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iCalvinus free?

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

### Is Rio Doce Alerta free?

Rio Doce Alerta is free to download, with no in-app purchases.

### Do iCalvinus or Rio Doce Alerta have ads?

Neither iCalvinus nor Rio Doce Alerta shows ads.

### Which is updated more often, iCalvinus or Rio Doce Alerta?

iCalvinus ships an update every 3 days, and Rio Doce Alerta every 2 weeks. Most recently, iCalvinus was updated on October 30, 2026 and Rio Doce Alerta on November 3, 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.*