# HidroObserva vs Orifice Plate Pro

The clearest difference is price: HidroObserva at Free against Orifice Plate Pro's $7.99. HidroObserva also leads on update cadence (fortnightly vs monthly). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

HidroObserva is free to download; Orifice Plate Pro costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

HidroObserva ships an update fortnightly, Orifice Plate Pro monthly. The most recent releases landed on October 27, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | HidroObserva | Orifice Plate Pro |
| --- | --- | --- |
| Price | **Free** | $7.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Monthly |
| Size | 64 MB | 30 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Servicos e Informacoes do Brasil](https://appshunter.io/developer/1475781851) | [Rafael Furlan](https://appshunter.io/developer/1785411171) |

## What reviewers say

### HidroObserva

[App page](https://appshunter.io/ios/app/hidroobserva/id6449265378)

**Features:** macOS Compatibility

**In-app purchases:** none


### Orifice Plate Pro

[App page](https://appshunter.io/ios/app/orifice-plate-pro/id6739454140)

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

**In-app purchases:** none


## Frequently asked questions

### Is HidroObserva free?

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

### Is Orifice Plate Pro free?

Orifice Plate Pro costs $7.99, with no in-app purchases.

### Do HidroObserva or Orifice Plate Pro have ads?

Neither HidroObserva nor Orifice Plate Pro shows ads.

### Which is updated more often, HidroObserva or Orifice Plate Pro?

HidroObserva ships an update fortnightly, and Orifice Plate Pro monthly. Most recently, HidroObserva was updated on October 27, 2026 and Orifice Plate Pro on October 4, 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.*