# Rain? vs HeatWave

The clearest difference is in-app purchases: Rain? at none against HeatWave's 3. HeatWave's advantage is update cadence (every 11 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

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

Rain? ships an update every 2 months, HeatWave every 11 days. The most recent releases landed on October 3, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Rain? | HeatWave |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 11 days** |
| Monetization | — | Free |
| Size | 1 MB | 29 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [James Davie Limited](https://appshunter.io/developer/1880731156) | [Christopher Hefferman](https://appshunter.io/developer/1444958558) |

## What reviewers say

### Rain?

[App page](https://appshunter.io/ios/app/rain/id6759799759)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Rain? free?

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

### Is HeatWave free?

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

### Do Rain? or HeatWave have ads?

Neither Rain? nor HeatWave shows ads.

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

Rain? ships an update every 2 months, and HeatWave every 11 days. Most recently, Rain? was updated on October 3, 2026 and HeatWave on October 1, 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.*