# e vs Gra

The clearest difference is price: Gra at Free against e's $1.99. Gra also leads on in-app purchases (none vs 1) and update cadence (every 2 months vs every 8 months). e's advantage is device support (3 vs 1). On ads there is nothing between them.

Gra is free to download; e costs $1.99 up front. e sells 1 one-off in-app purchase. Gra asks for nothing beyond the download.

e ships an update every 8 months, Gra every 2 months. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | e | Gra |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/e-scope-3-in-1/id660574048/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 2 MB | 148 MB |
| Requires iOS | 12.0 | **10.0** |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [e-skett Corp.](https://appshunter.io/developer/591591895) | [Osaka Kyoiku University](https://appshunter.io/developer/1049614066) |

## What reviewers say

### e

[App page](https://appshunter.io/ios/app/e-scope-3-in-1/id660574048)

This app combines an oscilloscope, FFT analyzer, and signal generator. It allows real-time observation of audio device frequency characteristics and waveform analysis. Features include multiple oscilloscope modes, detailed FFT spectrum analysis, and various signal generation options.

**Highlights:** Oscilloscope with Normal, Trigger, and Single modes, FFT analyzer with peak level, frequency, and THD display, Signal generator for sine waves, white noise, and sweeps, Real-time FFT synchronization sweep mode, Screen capture and save functionality, Adjustable sensitivity and time span

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Automatic measurement option | $1.99 | one-time |


### Gra

[App page](https://appshunter.io/ios/app/gra-tone/id1508340419)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is e free?

e costs $1.99, and also offers in-app purchases.

### Is Gra free?

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

### Do e or Gra have ads?

Neither e nor Gra shows ads.

### Which is updated more often, e or Gra?

e ships an update every 8 months, and Gra every 2 months. Most recently, e was updated on October 29, 2026 and Gra on October 27, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*