# AudioTheory Guitars vs Doris by dgApps

The clearest difference is price: Doris by dgApps at Free against AudioTheory Guitars's $6.99. Doris by dgApps also leads on update cadence (every 3 weeks vs every 3 months). AudioTheory Guitars's advantage is in-app purchases (none vs 2) and iOS requirement (15.0 vs 17.5). On ads and device support there is nothing between them.

Doris by dgApps is free to download; AudioTheory Guitars costs $6.99 up front. Doris by dgApps sells 2 in-app purchases, starting at $8.99 per month. AudioTheory Guitars asks for nothing beyond the download.

AudioTheory Guitars ships an update every 3 months, Doris by dgApps every 3 weeks. Both last shipped on October 29, 2026.

## The numbers

| Metric | AudioTheory Guitars | Doris by dgApps |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Paid | — |
| Size | 412 MB | 8 MB |
| Requires iOS | **15.0** | 17.5 |
| Devices | iPad, Mac | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Fraser Mackenzie](https://appshunter.io/developer/1492337443) | [dgApps](https://appshunter.io/developer/357488432) |

## What reviewers say

### AudioTheory Guitars

[App page](https://appshunter.io/ios/app/audiotheory-guitars/id1492337444)

This app serves as a comprehensive reference for guitarists, offering interactive chord and fretboard diagrams. It simplifies music theory by allowing seamless transcription between piano and guitar, with customizable tuning and note exclusion features.

**Highlights:** Interactive chord and fretboard diagrams, Piano to guitar transcription, Customizable tuning and capo settings, Chord sheet playback, Note exclusion for playing in key, Left-handed mode

**Features:** Vision Pro support

**In-app purchases:** none


### Doris by dgApps

[App page](https://appshunter.io/ios/app/doris-by-dgapps/id6447811358)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Doris Monthly Subscription | $8.99 | per month |
| Doris Annual Subscription | $89.99 | per year |


## Frequently asked questions

### Is AudioTheory Guitars free?

AudioTheory Guitars costs $6.99, with no in-app purchases.

### Is Doris by dgApps free?

Doris by dgApps is free to download, with in-app purchases available.

### Do AudioTheory Guitars or Doris by dgApps have ads?

Neither AudioTheory Guitars nor Doris by dgApps shows ads.

### Which is updated more often, AudioTheory Guitars or Doris by dgApps?

AudioTheory Guitars ships an update every 3 months, and Doris by dgApps every 3 weeks. Most recently, AudioTheory Guitars was updated on October 29, 2026 and Doris by dgApps on October 29, 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.*