# SmartPLL vs BackWalls

The clearest difference is rating: SmartPLL at 5.0 against BackWalls's 4.0. BackWalls's advantage is iOS requirement (11.0 vs 13.1). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SmartPLL holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

## The numbers

| Metric | SmartPLL | BackWalls |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/smartpll/id1623497556/reviews)** | [4.0 (1 ratings)](https://appshunter.io/ios/app/backwalls/id1672657308/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | — |
| Monetization | Free | Free |
| Size | 1 MB | 38 MB |
| Requires iOS | 13.1 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Z-Communications](https://appshunter.io/developer/1285508714) | [Hrishi Suthar](https://appshunter.io/developer/1660005858) |

## What reviewers say

### SmartPLL

[App page](https://appshunter.io/ios/app/smartpll/id1623497556)

This application allows users to program and control Z-COMM SSG series Smart Phase Locked Loop (PLL) modules. Adjust frequency, sweep mode, step time, and power output via Bluetooth or USB. Features LED status indicators and a rugged design for field or benchtop use.

**Highlights:** Bluetooth programming, USB connectivity, Frequency adjustment, Sweep mode control, Step time and size configuration, Power output adjustment, LED status indicators

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### BackWalls

[App page](https://appshunter.io/ios/app/backwalls/id1672657308)

Discover a vast collection of wallpapers organized into categories. Save your favorites with bookmarks and preview them before applying. Upload your own creations to the cloud.

**Highlights:** Material UI design, Categorized wallpaper library, Bookmark favorite wallpapers, Cloud upload functionality, Wallpaper preview mode

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SmartPLL free?

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

### Is BackWalls free?

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

### Which has better reviews, SmartPLL or BackWalls?

SmartPLL is rated higher. SmartPLL averages 5.0 out of 5 from 1 ratings, while BackWalls averages 4.0 from 1 ratings.

### Do SmartPLL or BackWalls have ads?

Neither SmartPLL nor BackWalls shows ads.

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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.*