# HeatWave vs iBarometer

The clearest difference is in-app purchases: iBarometer at none against HeatWave's 3. HeatWave's advantage is ads (none vs shown). On price, review sentiment, update cadence and device support there is nothing between them.

Both are free to download. HeatWave sells 3 one-off in-app purchases. iBarometer asks for nothing beyond the download.

HeatWave ships an update every 11 days, iBarometer every 9 days. The most recent releases landed on August 14, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | HeatWave | iBarometer |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 11 days | **Every 9 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 29 MB | 7 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Christopher Hefferman](https://appshunter.io/developer/1444958558) | [景珂 陈](https://appshunter.io/developer/620312170) |

## What reviewers say

### HeatWave

[App page](https://appshunter.io/ios/app/heatwave-smart-window-alerts/id6773258116)

This app monitors outdoor and indoor temperatures to alert you when to open or close your windows for optimal home climate control. It uses your HomePod's sensor and local weather forecasts to provide timely notifications, helping you save energy and stay comfortable without an air conditioner.

**Highlights:** Real-time indoor/outdoor temperature display, Forecast-based opening/closing alerts, 30-minute advance notifications, Home screen widgets, Privacy-first, no servers or tracking, Multi-language support

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coffee Money Tip | $2.99 | one-time |
| Pint Money Tip | $4.99 | one-time |
| Dinner Money Tip | $14.99 | one-time |


### iBarometer

[App page](https://appshunter.io/ios/app/ibarometer-barometer/id6787407049)

This app transforms your iPhone into a professional barometer, providing real-time atmospheric pressure readings and trend analysis. It includes historical graphs, altitude display, and a fishing activity score. It functions offline and offers advanced fishing predictions with a Pro upgrade.

**Highlights:** Real-time atmospheric pressure, Trend indicator and rate of change, Altitude display, Historical pressure graphs, Fishing activity score, Offline functionality

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

**In-app purchases:** none


## Frequently asked questions

### Is HeatWave free?

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

### Is iBarometer free?

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

### Do HeatWave or iBarometer have ads?

iBarometer shows ads; HeatWave does not.

### Which is updated more often, HeatWave or iBarometer?

HeatWave ships an update every 11 days, and iBarometer every 9 days. Most recently, HeatWave was updated on August 14, 2026 and iBarometer on September 13, 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.*