# Xkey Plus vs lo

The clearest difference is price: Xkey Plus at Free against lo's $9.99. Xkey Plus also leads on iOS requirement (9.3 vs 11.0). lo's advantage is rating (5.0 vs 2.9) and review sentiment (67% vs 36%). On ratings volume, ads and in-app purchases there is nothing between them.

Xkey Plus is free to download; lo costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

lo holds the better App Store score, 5.0 against 2.9. Both are backed by a comparable volume of ratings — 13 and 29 respectively. Written reviews point the same way: 36% of Xkey Plus's written reviews are positive against 67% of lo's.

Xkey Plus ships an update every 3 months, lo fortnightly. The most recent releases landed on October 10, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Xkey Plus | lo |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | [2.9 (13 ratings)](https://appshunter.io/ios/app/xkey-plus/id698087460/reviews) | **[5.0 (29 ratings)](https://appshunter.io/ios/app/lo-fi-af/id6444068732/reviews)** |
| Number of ratings | 13 | **29** |
| Positive reviews | 35.7% of reviews | **66.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | **Free** | Paid |
| Size | 9 MB | 17 MB |
| Requires iOS | **9.3** | 11.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ESI Audiotechnik GmbH](https://appshunter.io/developer/1627424644) | [Unfiltered Audio](https://appshunter.io/developer/1638381375) |

## What reviewers say

### Xkey Plus

[App page](https://appshunter.io/ios/app/xkey-plus/id698087460)

This app enhances the functionality of ESI Xkey musical keyboards on mobile devices. It allows users to update firmware, customize velocity curves, and configure key sensitivity and timings for an advanced user experience.

**Highlights:** Check for new Xkey firmware, Velocity curves editor, Configure Xkey sensitivity & timings, Access all Xkey parameters, Configure key & button assignments, Access Xkey documentation & support

**Features:** macOS Compatibility

**In-app purchases:** none


### lo

[App page](https://appshunter.io/ios/app/lo-fi-af/id6444068732)

This app offers a versatile toolkit for manipulating audio with a variety of lo-fi effects. Explore historical audio degradation, modern digital artifacts, and analog warmth to transform your sound.

**Highlights:** Convolution reverb with unique impulse responses, Spectral processing for MP3 simulation and pitch shifting, Digital section with bitcrusher and CD stutter, Analog section with tape saturation and noise generation, Rearrangeable processing sections, Dozens of presets for sound warping

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Xkey Plus free?

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

### Is lo free?

lo costs $9.99, with no in-app purchases.

### Which has better reviews, Xkey Plus or lo?

lo is rated higher. Xkey Plus averages 2.9 out of 5 from 13 ratings, while lo averages 5.0 from 29 ratings.

### Do Xkey Plus or lo have ads?

Neither Xkey Plus nor lo shows ads.

### Which is updated more often, Xkey Plus or lo?

Xkey Plus ships an update every 3 months, and lo fortnightly. Most recently, Xkey Plus was updated on October 10, 2026 and lo on October 6, 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.*