# AirCompare™ vs Plain CALENDAR_

The clearest difference is update cadence: Plain CALENDAR_ at every 2 days against AirCompare™'s every 3 months. 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.

AirCompare™ ships an update every 3 months, Plain CALENDAR_ every 2 days. The most recent releases landed on October 7, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | AirCompare™ | Plain CALENDAR_ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/aircompare/id1265636598/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 days** |
| Monetization | Free | — |
| Size | 7 MB | 107 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Wayne Henderson](https://appshunter.io/developer/1265636597) | [Hyobeom Han](https://appshunter.io/developer/1739693153) |

## What reviewers say

### AirCompare™

[App page](https://appshunter.io/ios/app/aircompare/id1265636598)

Optimize home energy usage and save money with smart ventilation and thermostat control. This app analyzes indoor and outdoor air quality, local weather, and electricity rates to automatically adjust your HomeKit-enabled devices for optimal comfort and cost savings.

**Highlights:** Ventilation controller, Thermostat controller, Automatic HomeKit device control, Energy consumption reduction, Weather and electricity rate analysis, Customizable rain sensitivity

**Features:** macOS Compatibility

**In-app purchases:** none


### Plain CALENDAR_

[App page](https://appshunter.io/ios/app/plain-calendar/id6523414947)

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

**In-app purchases:** none


## Frequently asked questions

### Is AirCompare™ free?

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

### Is Plain CALENDAR_ free?

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

### Do AirCompare™ or Plain CALENDAR_ have ads?

Neither AirCompare™ nor Plain CALENDAR_ shows ads.

### Which is updated more often, AirCompare™ or Plain CALENDAR_?

AirCompare™ ships an update every 3 months, and Plain CALENDAR_ every 2 days. Most recently, AirCompare™ was updated on October 7, 2026 and Plain CALENDAR_ on October 2, 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.*