Erol Singer's Studio vs Voice Spectrogram Logger
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Erol Singer's Studio
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.
- Progressive vocal lessons
- Super-smooth pitch tracking
- Technique and sound training
- Prevent common singing mistakes
- Optional exercise editor
- Award-winning coach designed
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"This may be the best iPad app yet. Worth buying the iPad for all by itself. Range, power, clarity, all improving day by day. A wonderful tool." - Music in Ashcroft Can I learn to sing? If you can talk, you can sing. Singing is a completely natural activity; our voices are designed for both speaking and singing (in ancient human tribes, everyone sang, not just a few “professional” singers). Singing uses basically the same skills as speech, but for singing we use our breath differently, hold sounds longer, and use a wider range of tones. Don’t I need talent? You may not be able to become the fastest marathon runner. However, unless you have a physical condition that prevents you from running, you can most definitely train to run marathons successfully, and get very good at it through regular exercise. Similarly, you may not be able to become the next Pavarotti; however, you can be as good as many professional singers who sing for a living, provided you train your voice regularly and with focus. Even if you’re not willing to put in a lot of effort, you can always improve from where you are, and have fun singing. Why do I need training? Just as you can’t run a marathon without any training and practice, you can’t sing well without training and practice. Lessons used in Erol Singer’s Studio focus on techniques and sounds that show you how to use your voice effectively, and prevent you from making the most common mistakes in singing, such as breathing poorly and closing your throat (e.g. by letting your larynx rise up). These carefully selected sounds, which have been in use for centuries around the world, ensure that your muscles are coordinated in the most useful ways for singing. By practicing these sounds and building up the muscle memory, it becomes easier to sing other sounds as well and you have more freedom in different parts of your vocal range. Why Erol Singer’s Studio? With Erol Singer’s Studio, we defined a new genre of vocal training software starting in 2012, and have improved it year after year with your feedback and our own ideas. Patented at its core, the app comes with a complete set of lessons organized into progressive levels designed by an award winning singer and vocal coach, best in class super-smooth pitch tracking technology that’s a joy to use, and an optional built-in exercise editor for those who’d like to add their own patterns/song-snippets for practice. But don’t take our word for it; download for free¹ and see for yourself. Terms of Use: https://www.erolstudios.com/ToU-ESS-iOS.html ¹ Beginner 1 & 2, and select exercises in other levels are included for free, while the complete set of lessons requires an active subscription. If you decide to purchase a subscription, payment will be charged to your Apple ID account when you confirm your purchase. Subscription automatically renews unless canceled at least 24 hours before the end of the current period; your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions via your account settings on the App Store after purchase.
Voice Spectrogram Logger
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.
- 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
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1. DESPLAY The spectrogram of voice is displayed in the range of 20 - 2500Hz. You can zoom in/out the spectrogram by pinching in/out smoothly. Also landscape orientation is supported. 2. USEFUL By moving "vivid" slider, the gradation of spectrogram is controlled. The gradation is also controlled by moving "baseline" slider in "Setting" tab and selecting "Mean" or "RMS" as the way of smoothing the spectrogram out. 3. LOGGING When "log" switch is ON, this app runs in the logging mode. To choose a past log from "History" tab, you can pull it from iPhone via email as a PNG file. 4. AVAILABLE Without cellular data service, the full functions are available. The background processing is supported. 5. TECHNICAL NOTE Sample rate: 44.1kHz Bit depth: 32bit float FFT window function: Blackman FFT samples: 4096
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Erol Singer's Studio | Voice Spectrogram Logger |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (3.4K ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 85.3% of reviews — better | 0.0% of reviews |
| Number of ratings | 3.4K — better | 1 |
| Update frequency | Every 6 weeks — better | Every 15 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.5 — better |
| Further details — not scored | ||
| Size | 108 MB | 7 MB |
| Age rating | 4+ | 12+ |
| Developer | Erol Studios | Yukiko Iwai |
Customer experience
Erol Singer's Studio
Voice Spectrogram Logger
Bugs and requests
Erol Singer's Studio
Reported bugs
2 issues- App crashes when using Bluetooth headphones
- Occasional loss of progress and purchased content
Requested features
5 requests- 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
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Erol Singer's Studio
- All Access$1.997 Days
- Add-ons for permanent licenses$2.991 Month
- All Access$6.991 Month
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- Add-ons for permanent licenses$24.991 Year
- All Access$49.991 Year
Voice Spectrogram Logger
- Remove Ads$3.99
Questions
Is Erol Singer's Studio free?
Is Voice Spectrogram Logger free?
Which has better reviews, Erol Singer's Studio or Voice Spectrogram Logger?
Do Erol Singer's Studio or Voice Spectrogram Logger have ads?
Which is updated more often, Erol Singer's Studio or Voice Spectrogram Logger?
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