# HY Exhaust vs Smart HL

The clearest difference is update cadence: Smart HL at monthly against HY Exhaust's every 2 months. HY Exhaust's advantage is iOS requirement (11.0 vs 13.0). 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, Smart HL monthly. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | HY Exhaust | Smart HL |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Size | 29 MB | 3 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [可 冯](https://appshunter.io/developer/991205890) | [人忠 张](https://appshunter.io/developer/1756024269) |

## What reviewers say

### HY Exhaust

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Smart HL

[App page](https://appshunter.io/ios/app/smart-hl/id6526489846)

**In-app purchases:** none


## Frequently asked questions

### Is HY Exhaust free?

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

### Is Smart HL free?

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

### Do HY Exhaust or Smart HL have ads?

Neither HY Exhaust nor Smart HL shows ads.

### Which is updated more often, HY Exhaust or Smart HL?

HY Exhaust ships an update every 2 months, and Smart HL monthly. Most recently, HY Exhaust was updated on November 3, 2026 and Smart HL on November 4, 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.*