# Erol Singer's Studio vs Voice Spectrogram Logger

The clearest difference is review sentiment: Erol Singer's Studio at 85% against Voice Spectrogram Logger's 0%. Erol Singer's Studio also leads on rating (4.8 vs 1.0) and update cadence (every 6 weeks vs every 15 months). Voice Spectrogram Logger's advantage is monetization model (free vs free with in-app purchases). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Erol Singer's Studio sells 5 in-app purchases, starting at $1.99 per 7 days and Voice Spectrogram Logger sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Erol Singer's Studio holds the better App Store score, 4.8 against 1.0. That said, the two scores are not equally well evidenced: Erol Singer's Studio has 3.4K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 85% of Erol Singer's Studio's written reviews are positive against 0% of Voice Spectrogram Logger's.

Erol Singer's Studio ships an update every 6 weeks, Voice Spectrogram Logger every 15 months. The most recent releases landed on October 13, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Erol Singer's Studio | Voice Spectrogram Logger |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (3.4K ratings)](https://appshunter.io/ios/app/erol-singers-studio/id502780186/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/voice-spectrogram-logger/id1277134462/reviews) |
| Number of ratings | **3.4K** | 1 |
| Positive reviews | **85.3% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 15 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 108 MB | 7 MB |
| Requires iOS | 15.6 | **15.5** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Erol Studios](https://appshunter.io/developer/502780529) | [Yukiko Iwai](https://appshunter.io/developer/965630131) |

## What reviewers say

### Erol Singer's Studio

[App page](https://appshunter.io/ios/app/erol-singers-studio/id502780186)

Learn to sing with structured lessons and advanced pitch tracking. This app provides techniques to improve vocal range, power, and clarity, preventing common singing mistakes. It's designed for all skill levels, from beginners to those seeking to refine their voice.

**Highlights:** Progressive vocal lessons, Super-smooth pitch tracking, Technique and sound training, Prevent common singing mistakes, Optional exercise editor, Award-winning coach designed

**Features:** Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Access | $1.99 | per 7 days |
| Add-ons for permanent licenses | $2.99 | per month |
| All Access | $6.99 | per month |
| Add-ons for permanent licenses | $24.99 | per year |
| All Access | $49.99 | per year |

**What reviewers like**

- 🚀 Excellent vocal training tool
- 👍 Intuitive and user-friendly interface
- 🎨 Visually appealing with clear feedback
- 💪 Helps improve vocal range and pitch
- 🎯 Accurate pitch detection and tracking

**What reviewers complain about**

- 💰 Subscription model can be expensive
- 🚫 Lack of Bluetooth headphone support
- 🤔 Unclear progression requirements
- 🔇 Lack of audio examples/demonstrations
- 🕰️ Exercises can feel repetitive over time

**Reported bugs**

- App crashes when using Bluetooth headphones
- Occasional loss of progress and purchased content

**Requested features**

- Add more exercise variety and song options
- Implement cloud sync and cross-device support
- Provide more customization options for exercises
- Include a metronome and tempo adjustment features
- Add community-created content and sharing


### Voice Spectrogram Logger

[App page](https://appshunter.io/ios/app/voice-spectrogram-logger/id1277134462)

Visualize voice frequencies in a spectrogram from 20-2500Hz. Adjust display with sliders and log recordings to export as PNG files. Functions fully offline and supports background processing.

**Highlights:** Real-time voice spectrogram display, Adjustable frequency range (20-2500Hz), Zoomable spectrogram with pinch gestures, Customizable spectrogram gradation, Logging mode with history export, Offline functionality

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $3.99 | one-time |


## Frequently asked questions

### Is Erol Singer's Studio free?

Erol Singer's Studio is free to download, with in-app purchases available.

### Is Voice Spectrogram Logger free?

Voice Spectrogram Logger is free to download, with in-app purchases available.

### Which has better reviews, Erol Singer's Studio or Voice Spectrogram Logger?

Erol Singer's Studio is rated higher. Erol Singer's Studio averages 4.8 out of 5 from 3.4K ratings, while Voice Spectrogram Logger averages 1.0 from 1 ratings.

### Do Erol Singer's Studio or Voice Spectrogram Logger have ads?

Neither Erol Singer's Studio nor Voice Spectrogram Logger shows ads.

### Which is updated more often, Erol Singer's Studio or Voice Spectrogram Logger?

Erol Singer's Studio ships an update every 6 weeks, and Voice Spectrogram Logger every 15 months. Most recently, Erol Singer's Studio was updated on October 13, 2026 and Voice Spectrogram Logger on October 2, 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.*