# HY Exhaust vs D

The clearest difference is update cadence: D at every 5 days against HY Exhaust's every 2 months. HY Exhaust's advantage is iOS requirement (11.0 vs 15.0). 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.

HY Exhaust ships an update every 2 months, D every 5 days. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | HY Exhaust | D |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 days** |
| Size | 29 MB | 43 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [可 冯](https://appshunter.io/developer/991205890) | [LUN LIU](https://appshunter.io/developer/1890125123) |

## What reviewers say

### HY Exhaust

[App page](https://appshunter.io/ios/app/hy-exhaust/id1664446057)

**Features:** macOS Compatibility

**In-app purchases:** none


### D

[App page](https://appshunter.io/ios/app/d-sync-ecu/id6761677479)

**Features:** iPhone Duo support

**In-app purchases:** none


## Frequently asked questions

### Is HY Exhaust free?

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

### Is D free?

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

### Do HY Exhaust or D have ads?

Neither HY Exhaust nor D shows ads.

### Which is updated more often, HY Exhaust or D?

HY Exhaust ships an update every 2 months, and D every 5 days. Most recently, HY Exhaust was updated on November 3, 2026 and D on November 5, 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.*