# iDousyn vs Viola Tuner Professional

The clearest difference is price: iDousyn at $5.99 against Viola Tuner Professional's $12.99. iDousyn also leads on rating (4.2 vs 3.9) and ratings volume (161 vs 9). Viola Tuner Professional's advantage is iOS requirement (15.6 vs 26.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

iDousyn costs $5.99 and Viola Tuner Professional $12.99 up front. iDousyn sells 1 one-off in-app purchase and Viola Tuner Professional sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

iDousyn holds the better App Store score, 4.2 against 3.9. That said, the two scores are not equally well evidenced: iDousyn has 161 ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 34% of iDousyn's written reviews are positive against 22% of Viola Tuner Professional's.

iDousyn ships an update every 2 months, Viola Tuner Professional every 4 months. Both last shipped on October 29, 2026.

## The numbers

| Metric | iDousyn | Viola Tuner Professional |
| --- | --- | --- |
| Price | **$5.99** | $12.99 |
| Rating | **[4.2 (161 ratings)](https://appshunter.io/ios/app/idousyn/id421852860/reviews)** | [3.9 (9 ratings)](https://appshunter.io/ios/app/viola-tuner-professional/id806811415/reviews) |
| Number of ratings | **161** | 9 |
| Positive reviews | **34.1% of reviews** | 22.2% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 1.2 GB | 7 MB |
| Requires iOS | 26.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jorge Lozada](https://appshunter.io/developer/421852863) | [Pedro Daniel Macalupu Cumpen](https://appshunter.io/developer/492172409) |

## What reviewers say

### iDousyn

[App page](https://appshunter.io/ios/app/idousyn/id421852860)

This app transforms your device into a professional music production tool. It features a sample-based synthesizer with dual-layer sampling, advanced filters, and a professional effects chain. Create immersive sounds and build captivating tracks with an intuitive interface and extensive sound library.

**Highlights:** Dual-layer sampling, Advanced filters and EQ, Professional effects chain, Creative chord pads, MIDI mastery, Expansive sound library

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Pro | Free | one-time |

**What reviewers like**

- 👍 Good clean sounds
- 👍 Simple to use
- 👍 Low CPU usage
- 👍 Sounds great
- 👍 Great piano and strings app

**What reviewers complain about**

- 🐛 Ads pop up making it unplayable
- 🐛 Full version still displays full-page ads
- 🐛 Ads appear on the front page
- 🐛 Ads are annoying
- 🐛 Totally unusable product

**Reported bugs**

- App crashes immediately
- Full version displays full-page ads
- Ads appear on the front page
- New update has ads
- Implemented trackers

**Requested features**

- Adaptive Crasher (AUV3, Adaptive Cubasis and Zenbeats)
- AUV3 support
- Audiobus compatibility
- MIDI IN for better keyboard control
- Background audio option


### Viola Tuner Professional

[App page](https://appshunter.io/ios/app/viola-tuner-professional/id806811415)

This application provides precise and easy viola tuning with instant loading and high responsiveness. It features an intuitive interface with visual indicators and offers advanced settings and a tuning fork as in-app purchases. Suitable for musicians of all skill levels.

**Highlights:** Precise frequency display in Hz, Multiple calibration options for A string, Instant loading and fast tuning, Intuitive UI with LED indicator, Visual indicators for tuned strings, Advanced settings and tuning fork (in-app purchase)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Settings | Free | one-time |
| Tuning Fork | Free | one-time |


## Frequently asked questions

### Is iDousyn free?

iDousyn costs $5.99, and also offers in-app purchases.

### Is Viola Tuner Professional free?

Viola Tuner Professional costs $12.99, and also offers in-app purchases.

### Which has better reviews, iDousyn or Viola Tuner Professional?

iDousyn is rated higher. iDousyn averages 4.2 out of 5 from 161 ratings, while Viola Tuner Professional averages 3.9 from 9 ratings.

### Do iDousyn or Viola Tuner Professional have ads?

Neither iDousyn nor Viola Tuner Professional shows ads.

### Which is updated more often, iDousyn or Viola Tuner Professional?

iDousyn ships an update every 2 months, and Viola Tuner Professional every 4 months. Most recently, iDousyn was updated on October 29, 2026 and Viola Tuner Professional 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.*