# 5ths Machine vs Cali Axis Guitar Amplifier

The clearest difference is price: 5ths Machine at $1.99 against Cali Axis Guitar Amplifier's $19.99. 5ths Machine also leads on iOS requirement (12.0 vs 15). Cali Axis Guitar Amplifier's advantage is ratings volume (7 vs 1). On rating, update cadence, ads and in-app purchases there is nothing between them.

5ths Machine costs $1.99 and Cali Axis Guitar Amplifier $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for 5ths Machine against 5.0 for Cali Axis Guitar Amplifier. That said, the two scores are not equally well evidenced: Cali Axis Guitar Amplifier has 7 ratings behind it against 1, so its average is the more settled of the two.

5ths Machine ships an update every 24 months, Cali Axis Guitar Amplifier every 38 months. The most recent releases landed on October 16, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | 5ths Machine | Cali Axis Guitar Amplifier |
| --- | --- | --- |
| Price | **$1.99** | $19.99 |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/5ths-machine/id1582877284/reviews) | [5.0 (7 ratings)](https://appshunter.io/ios/app/cali-axis-guitar-amplifier/id6451101787/reviews) |
| Number of ratings | 1 | **7** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 24 months** | Every 38 months |
| Monetization | Paid | Paid |
| Size | 18 MB | 29 MB |
| Requires iOS | **12.0** | 15 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | +4 |
| Developer | [Lucy Hudson](https://appshunter.io/developer/1179157812) | [Nembrini Audio](https://appshunter.io/developer/1493296895) |

## What reviewers say

### 5ths Machine

[App page](https://appshunter.io/ios/app/5ths-machine/id1582877284)

Explore the theoretical intricacies of key signatures with an interactive quiz. Learn about the 12-position equal temperament system and discover how to identify keys with an unusual number of sharps. Understand music theory through a unique perspective.

**Highlights:** Key signature quiz, Equal temperament system explanation, Theoretical key signature exploration, Background information on music theory, Quiz tips and strategies, Chronology of music theory concepts

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

**In-app purchases:** none


### Cali Axis Guitar Amplifier

[App page](https://appshunter.io/ios/app/cali-axis-guitar-amplifier/id6451101787)

This app offers a versatile guitar amplifier simulation with multiple preamp modes, an FX section, and a power amp. It includes digital delay, analog modulations, ambient reverb, and a noise gate for shaping your sound. Works as a standalone app or with other audio applications.

**Highlights:** Multiple preamp modes, Adjustable FX section, Virtual EL34 power tubes, Digital delay with filter and offset, Analog Chorus or Tremolo, Ambient Hall reverb, Noise gate and studio compressor

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 5ths Machine free?

5ths Machine costs $1.99, with no in-app purchases.

### Is Cali Axis Guitar Amplifier free?

Cali Axis Guitar Amplifier costs $19.99, with no in-app purchases.

### Which has better reviews, 5ths Machine or Cali Axis Guitar Amplifier?

5ths Machine and Cali Axis Guitar Amplifier are both rated 5.0 out of 5 on the App Store, from 1 and 7 ratings respectively.

### Do 5ths Machine or Cali Axis Guitar Amplifier have ads?

Neither 5ths Machine nor Cali Axis Guitar Amplifier shows ads.

### Which is updated more often, 5ths Machine or Cali Axis Guitar Amplifier?

5ths Machine ships an update every 24 months, and Cali Axis Guitar Amplifier every 38 months. Most recently, 5ths Machine was updated on October 16, 2026 and Cali Axis Guitar Amplifier on October 30, 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.*