# E vs RCA Certificate

The clearest difference is in-app purchases: RCA Certificate at none against E's 1. RCA Certificate also leads on iOS requirement (13.0 vs 17.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. E sells 1 one-off in-app purchase. RCA Certificate asks for nothing beyond the download.

E ships an update every 3 months, RCA Certificate every 5 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | E | RCA Certificate |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 5 months |
| Monetization | Free | — |
| Size | 203 MB | 31 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [David Palmerio](https://appshunter.io/developer/348861875) | [Cogneti, LLC](https://appshunter.io/developer/690595877) |

## What reviewers say

### E

[App page](https://appshunter.io/ios/app/e-jazz-learn-jazz-guitar/id376532788)

Learn jazz guitar with practical, step-by-step lessons covering chords, progressions, and substitutions. This course is designed for intermediate players looking to understand jazz concepts without overwhelming theory.

**Highlights:** Step-by-step jazz guitar lessons, Covers chords and progressions, Includes theory, tips, tabs, and video, Explains chord embellishments and substitutions, Learn to create own jazz chord progressions, Lessons inspired by jazz standards

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access | $3.99 | one-time |


### RCA Certificate

[App page](https://appshunter.io/ios/app/rca-certificate/id1610932123)

**In-app purchases:** none


## Frequently asked questions

### Is E free?

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

### Is RCA Certificate free?

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

### Do E or RCA Certificate have ads?

Neither E nor RCA Certificate shows ads.

### Which is updated more often, E or RCA Certificate?

E ships an update every 3 months, and RCA Certificate every 5 months. Most recently, E was updated on November 1, 2026 and RCA Certificate on November 3, 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.*