# NADIR vs Open/Shut

NADIR and Open/Shut are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

## The numbers

| Metric | NADIR | Open/Shut |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 85.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Daily |
| Monetization | Free | — |
| Size | 3 MB | 65 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [solal gendrin](https://appshunter.io/developer/1895315169) | [Berenger.dev](https://appshunter.io/developer/1697103676) |

## What reviewers say

### NADIR

[App page](https://appshunter.io/ios/app/nadir/id6788036137)

This app helps you optimize your home's temperature by comparing indoor and outdoor conditions hour by hour. It provides precise recommendations on when to open and close windows for natural cooling without air conditioning.

**Highlights:** Hourly indoor/outdoor temperature comparison, Daily recommended window opening times, 30-hour projected temperature graph, Open/close window alerts, Home thermal physics explanations, Home screen widgets

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

**In-app purchases:** none


### Open/Shut

[App page](https://appshunter.io/ios/app/openshut/id6795116448)

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

**In-app purchases:** none


## Frequently asked questions

### Is NADIR free?

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

### Is Open/Shut free?

Open/Shut is free to download, with no in-app purchases.

### Do NADIR or Open/Shut have ads?

Neither NADIR nor Open/Shut shows ads.

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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.*