# Smart Heat vs Di

The clearest difference is update cadence: Di at fortnightly against Smart Heat's every 5 weeks. 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.

Smart Heat ships an update every 5 weeks, Di fortnightly. The most recent releases landed on September 19, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Smart Heat | Di |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Fortnightly** |
| Size | 45 MB | 32 MB |
| Requires iOS | 12.2 | 12.2 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Solareast heat pump co.,Ltd](https://appshunter.io/developer/1660560477) | [蓉 关](https://appshunter.io/developer/1297220895) |

## What reviewers say

### Smart Heat

[App page](https://appshunter.io/ios/app/smart-heat-pump/id1660560475)

**Features:** macOS Compatibility

**In-app purchases:** none


### Di

[App page](https://appshunter.io/ios/app/di-link-iot/id6747150306)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Smart Heat free?

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

### Is Di free?

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

### Do Smart Heat or Di have ads?

Neither Smart Heat nor Di shows ads.

### Which is updated more often, Smart Heat or Di?

Smart Heat ships an update every 5 weeks, and Di fortnightly. Most recently, Smart Heat was updated on September 19, 2026 and Di on October 30, 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.*