# iDiapason vs Viola Tuner Basic

The clearest difference is rating: Viola Tuner Basic at 4.1 against iDiapason's 1.0. Viola Tuner Basic also leads on review sentiment (38% vs 0%) and update cadence (every 2 weeks vs every 202 months). iDiapason's advantage is in-app purchases (none vs 5) and ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Viola Tuner Basic sells 5 one-off in-app purchases. iDiapason asks for nothing beyond the download.

Viola Tuner Basic holds the better App Store score, 4.1 against 1.0. That said, the two scores are not equally well evidenced: Viola Tuner Basic has 194 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of iDiapason's written reviews are positive against 38% of Viola Tuner Basic's.

iDiapason ships an update every 202 months, Viola Tuner Basic every 2 weeks. The most recent releases landed on June 10, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | iDiapason | Viola Tuner Basic |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/idiapason/id325550985/reviews) | **[4.1 (194 ratings)](https://appshunter.io/ios/app/viola-tuner-basic/id1420916705/reviews)** |
| Number of ratings | 1 | **194** |
| Positive reviews | 0.0% of reviews | **37.5% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 202 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 3 MB | 12 MB |
| Requires iOS | 16.6 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Punctus Multimedia](https://appshunter.io/developer/325550989) | [Pedro Daniel Macalupu Cumpen](https://appshunter.io/developer/492172409) |

## What reviewers say

### iDiapason

[App page](https://appshunter.io/ios/app/idiapason/id325550985)

This app provides a precise digital tuning fork for musicians and choir directors. It offers a clean interface with reference pitches and a unique shake-to-play gesture, delivering an authentic and distraction-free tuning experience.

**Highlights:** Reference pitches (435-444 Hz), Real recorded tuning fork sound, Shake-to-play interaction, Smooth audio fade-out, Visual feedback animation, Minimalist design

**Features:** macOS Compatibility

**In-app purchases:** none


### Viola Tuner Basic

[App page](https://appshunter.io/ios/app/viola-tuner-basic/id1420916705)

Instantly tune your viola with precision and ease. This app offers ultra-accurate frequency display, adjustable A4 temperaments, and intuitive LED guidance. It's perfect for musicians of all levels, from beginners to professionals.

**Highlights:** Ultra-accurate frequency display (Hz), Adjustable A4 temperaments (392Hz–466Hz), LED tuning indicator, Tuned string lights up on screen, High sensitivity and fast response, Tuning fork (IAP), Advanced settings (IAP)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads | $3.99 | one-time |
| A4 Calibrations 392Hz to 466Hz | $3.99 | one-time |
| Settings | $3.99 | one-time |
| Tuning Fork | $3.99 | one-time |
| Metronome | $3.99 | one-time |


## Frequently asked questions

### Is iDiapason free?

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

### Is Viola Tuner Basic free?

Viola Tuner Basic is free to download, with in-app purchases available.

### Which has better reviews, iDiapason or Viola Tuner Basic?

Viola Tuner Basic is rated higher. iDiapason averages 1.0 out of 5 from 1 ratings, while Viola Tuner Basic averages 4.1 from 194 ratings.

### Do iDiapason or Viola Tuner Basic have ads?

Viola Tuner Basic shows ads; iDiapason does not.

### Which is updated more often, iDiapason or Viola Tuner Basic?

iDiapason ships an update every 202 months, and Viola Tuner Basic every 2 weeks. Most recently, iDiapason was updated on June 10, 2026 and Viola Tuner Basic on September 21, 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.*