# SmartCheckSLS vs KNOBWELL

The clearest difference is update cadence: KNOBWELL at every 4 days against SmartCheckSLS's every 8 months. KNOBWELL also leads on iOS requirement (13.0 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.

SmartCheckSLS ships an update every 8 months, KNOBWELL every 4 days. Both last shipped on October 2, 2026.

## The numbers

| Metric | SmartCheckSLS | KNOBWELL |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 4 days** |
| Size | 108 MB | 156 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Industrial Augmented Reality S.L.](https://appshunter.io/developer/1574310834) | [Suzhou Wuqueqiao trading Co., LTD](https://appshunter.io/developer/1743620569) |

## What reviewers say

### SmartCheckSLS

[App page](https://appshunter.io/ios/app/smartchecksls/id6443825301)

**Features:** macOS Compatibility

**In-app purchases:** none


### KNOBWELL

[App page](https://appshunter.io/ios/app/knobwell/id6499482819)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SmartCheckSLS free?

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

### Is KNOBWELL free?

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

### Do SmartCheckSLS or KNOBWELL have ads?

Neither SmartCheckSLS nor KNOBWELL shows ads.

### Which is updated more often, SmartCheckSLS or KNOBWELL?

SmartCheckSLS ships an update every 8 months, and KNOBWELL every 4 days. Most recently, SmartCheckSLS was updated on October 2, 2026 and KNOBWELL on October 2, 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.*