# Ventilate vs Ooh!

Ventilate and Ooh! are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases 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. Ventilate sells 2 in-app purchases, starting at $0.99 per 7 days and Ooh! sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 5 days. The most recent releases landed on October 29, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Ventilate | Ooh! |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ventilate-when-to-open/id6786653699/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 days | Every 5 days |
| Monetization | Freemium | — |
| Size | 16 MB | 4 MB |
| Requires iOS | 18.6 | **18.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Vivace App Studio](https://appshunter.io/developer/1795460622) | [Mamoru Kijima](https://appshunter.io/developer/900904669) |

## What reviewers say

### Ventilate

[App page](https://appshunter.io/ios/app/ventilate-when-to-open/id6786653699)

This app provides personalized guidance on when to open or close windows and where to place fans based on local weather and indoor temperature. It helps optimize home cooling by suggesting the use of outdoor air when it's cooler, potentially reducing air conditioning use.

**Highlights:** Per-window advice (close, crack, open wide), Fan placement guidance, Weather-based timing, Outdoor air cooling optimization, Indoor temperature history chart, Gentle reminders, Home Screen widget and Siri integration

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Ventilate Pro | $0.99 | per 7 days |
| Yearly Ventilate Pro | $9.99 | per year |


### Ooh!

[App page](https://appshunter.io/ios/app/ooh/id6803033167)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Scans | $7.99 | one-time |


## Frequently asked questions

### Is Ventilate free?

Ventilate is free to download, with in-app purchases available.

### Is Ooh! free?

Ooh! is free to download, with in-app purchases available.

### Do Ventilate or Ooh! have ads?

Neither Ventilate nor Ooh! shows ads.

### Which is updated more often, Ventilate or Ooh!?

Ventilate ships an update every 5 days, and Ooh! every 5 days. Most recently, Ventilate was updated on October 29, 2026 and Ooh! on October 14, 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.*