# 1 to A vs Number System Trainer

The clearest difference is in-app purchases: Number System Trainer at none against 1 to A's 1. Number System Trainer also leads on ratings volume (12 vs 3) and iOS requirement (15.0 vs 18.5). On price, rating, review sentiment and ads there is nothing between them.

Both are free to download. 1 to A sells 1 one-off in-app purchase. Number System Trainer asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for 1 to A against 5.0 for Number System Trainer. Both are backed by a comparable volume of ratings — 3 and 12 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

## The numbers

| Metric | 1 to A | Number System Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/1-to-a/id6747511294/reviews) | [5.0 (12 ratings)](https://appshunter.io/ios/app/number-system-trainer/id6786437503/reviews) |
| Number of ratings | 3 | **12** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | — | Weekly |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 14 MB | 10 MB |
| Requires iOS | 18.5 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Sean Moses](https://appshunter.io/developer/1821187325) | [Brandon Oaks](https://appshunter.io/developer/6786437505) |

## What reviewers say

### 1 to A

[App page](https://appshunter.io/ios/app/1-to-a/id6747511294)

Learn the Nashville Number System for music. Select a key and instantly see corresponding chords. Tap any number to view fingering diagrams.

**Highlights:** Nashville Number System explained, Chord translations for major keys, Fingering diagrams for chords, Key selection, Interactive chord lookup

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 to A Premium | $1.99 | one-time |


### Number System Trainer

[App page](https://appshunter.io/ios/app/number-system-trainer/id6786437503)

Learn and master the Nashville Number System for music. This app offers interactive modules to help musicians of all levels understand chord progressions, transpose songs, and improve their ear training. It's designed for quick learning and on-the-fly musical communication.

**Highlights:** Interactive learning modules, Chord reading and identification, Instant transposition, Ear training exercises, Visual chord shapes, Circle of 4ths & 5ths reference

**Features:** macOS Compatibility, Family Sharing

**In-app purchases:** none


## Frequently asked questions

### Is 1 to A free?

1 to A is free to download, with in-app purchases available.

### Is Number System Trainer free?

Number System Trainer is free to download, with no in-app purchases.

### Which has better reviews, 1 to A or Number System Trainer?

1 to A and Number System Trainer are both rated 5.0 out of 5 on the App Store, from 3 and 12 ratings respectively.

### Do 1 to A or Number System Trainer have ads?

Neither 1 to A nor Number System Trainer 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.*