# FrequenSee - Spectrum Analyzer — Visualizing Sound in Motion

> Responsive audio spectrum analyzer visualizing sound in real-time. (iPhone/iPad app by Daniel Bach.)

- Source: https://appshunter.io/ios/app/frequensee-spectrum-analyzer/id583945921 (this page in markdown: same URL + `.md`)
- Developer: [Daniel Bach](https://appshunter.io/developer/554766781)
- Category: Music, Utilities
- Price: $2.99
- Rating: 2.90/5 from 11 App Store ratings · 32 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 7 MB
- Languages: American English
- Released: 2012-12-08
- Data updated: 2026-08-31
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/frequensee-spectrum-analyzer/id583945921/reviews.md

## What is FrequenSee?

The most responsive audio spectrum analyzer you have ever seen! Welcome to the world of sound in motion.

- Using a custom signal processing design related to the process of human hearing
- Performs and displays 24.000 measurements per second
- Offers stunning time precision and extended precision for low frequencies
- Enhances the professionals toolkit with real-time capabilities
- Discover music, voice and environmental sounds in an exciting new way
- Make quick connections between sound sources and their respective frequency behavior
- Enables easy tracking of frequency and amplitude movements 
- Well optimized for the ARM architecture with efficient use of multi-threading
- The number of bands is device- and display-dependent, currently up to 500 bands
- Frequency range 20 Hz to 22 kHz with logarithmic scale
- Tuned for absolute low-latency in every step, from the microphone to the display

Credits:
- Using Metal graphics via MoltenVK 
- Font rendering is achieved via FreeType

## Key features

- Highly responsive audio spectrum analysis
- 24,000 measurements per second
- Precise low-frequency tracking
- Real-time sound visualization
- Up to 500 frequency bands
- 20 Hz to 22 kHz frequency range

## Recent user reviews (10 of 32)

All indexed reviews: https://appshunter.io/ios/app/frequensee-spectrum-analyzer/id583945921/reviews.md

### 5/5 — This Ap has been a God Send when it comes to Live Sound

*2023-08-30*

This Ap has been a God Send when it comes to Live Sound…… and I’ve used it for years!
Vocal Feedback in a Monitor?  Easily let’s you find what to “Cut”!
Vocals just don’t quite sound right … Helps to both Cut or Boost!!
I keep my phone handy & get get my PA up & running in NO TIME 👏👏👏

### 1/5 — Not accurate.

*2023-04-01*

4kh sound displayed as 12kh peak on display.    Results aren’t in the ballpark. Not usable.

**Developer response:** Not sure if this is an April Fools' joke?
Either way, I will make sure the next version is accurate for sine sweeps and pink noise. In my recent findings I can say Fourier based analyzers are very inaccurate for pink noise, the properly calibrated version of FrequenSee should be superior.

### 1/5 — Why did you change it??

*2023-03-19*

This app used to be so perfect! It’s so hard to read now and it keeps freezing! Change it back please!

I’m a sound engineer and found the old visualizer to be so helpful and accurate! Now I can’t use it

**Developer response:** Version 3.1 won't freeze on iOS 16. Proper line drawing will come back in the next version. Accuracy is currently also top priority. The new version will merge the responsiveness of the current version with the smoothness of the old version and will be more accurate than ever.

### 1/5 — Malfunctioning

*2022-10-10*

This app used to work great until recently, now it intermittently freezes and will sometimes crash.

**Developer response:** I've updated to version 3.1 which won't freeze on iOS 16.0

### 1/5 — Why did you change it??

*2022-10-01, version 3.0*

This app used to be so perfect! It’s so hard to read now and it keeps freezing! Change it back please!

### 2/5 — Was brilliant

*2021-11-21*

When I first installed frquensee it worked great.After the latest update the line is so blurred and refresh rate so high that it is unusable.

**Developer response:** Well, version 2.0 was using simple FFT like everyone else. This however, is not the right way of measuring in respect to human perception. I acknowledge the current version has issues with blur and I already have an idea for version 4.0 greatly improving measurements and presentation.

### 5/5 — Всё работает молниеносно!

*2021-03-11*

Самое быстрое приложения для анализа спектра в реальном времени!

Супер!

### 2/5 — Liked the Old Display

*2021-02-08*

The older way of displaying frequencies was so much clearer.  Can we have an option of using the old or the new?

**Developer response:** Yes, there are plans for adding an option for suitable short-term averaging and improving upon the new frequency measurement system. If possible we want to avoid going back to the traditional Fourier-based analysis though, because we are not convinced by its accuracy. The goal is to achieve human-like perception quality.

### 1/5 — 更新变垃圾了。

*2021-01-05*

以前用的好好的这次更新后看都看不清楚了，开发者脑子想什么呢！

### 5/5 — Passt❗️

*2020-12-24*

Gut und günstig, für den schnellen Überblick! 👍

## Frequently asked questions about FrequenSee

### What is FrequenSee used for?

FrequenSee is an audio spectrum analyzer that visualizes sound in motion. It helps users discover music, voice, and environmental sounds by displaying their frequency behavior in real-time.

### How precise is FrequenSee?

FrequenSee performs 24,000 measurements per second, offering stunning time precision and extended precision for low frequencies. It is tuned for absolute low-latency from the microphone to the display.

### What is the frequency range and number of bands in FrequenSee?

The app covers a frequency range from 20 Hz to 22 kHz on a logarithmic scale. The number of bands is device- and display-dependent, currently supporting up to 500 bands.

### What devices does FrequenSee support?

FrequenSee is available for iPhone, iPad, and iPod. It is well optimized for the ARM architecture, utilizing multi-threading for efficient performance.

### How often is FrequenSee updated?

The latest version, 3.1, was released on October 19, 2022. While specific update frequency isn't detailed, the app has been actively developed since its release in 2012.

### What is the price of FrequenSee?

FrequenSee is a paid application, priced at $2.99. There are no in-app purchases or subscriptions mentioned.

### What is the age rating for FrequenSee?

FrequenSee has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content concerns.

### Does FrequenSee have ads?

The provided data does not indicate the presence of advertisements in FrequenSee. It is a paid application, suggesting an ad-free experience.

## Version history (last 5 releases)

### 3.1 — 2022-10-19

- addresses a rendering issue to make the app run on iOS 16
- improves presentation of drawing using a more uniform shape with brighter color
- features a few audio processing improvements

### 3.0 — 2020-12-22

FrequenSee 3.0 completely developed from scratch! It no longer uses Fourier Transform (FFT), and is now instead using a custom signal processing design related to the process of human hearing, resulting in a very much improved time accuracy.

### 2.1 — 2017-05-08

- changed sampling rate to 48 kHz, improving the support for iPhone 6s and iPhone 7, and improving the quality in general
- uses the measurement mode, minimizing the amount of system-supplied signal processing 
- should now have a flat frequency response curve (influenced by microphone characteristics)

### 2.0 — 2017-03-16

completely refined version 2.0:
- improved accuracy
- improved latency
- improved rendering on large screens
- improved connection to iOS audio
- added some supporting lines to the coordinate system
- added iPad support via universal binary

### 1.0 — 2012-12-08

No release notes.

## Apps similar to FrequenSee

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| [MuVis - Music Visualizer](https://appshunter.io/ios/app/muvis-music-visualizer/id1582324352) | 5.0 (7) | Free | Music |
| [SoundScope VR](https://appshunter.io/ios/app/soundscope-vr/id586918472) | 3.9 (8) | $24.99 | Music |
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| [Transfer Function](https://appshunter.io/ios/app/transfer-function/id824037130) | 3.0 (2) | $49.99 | Music |
| [AudioAnalyzerApp](https://appshunter.io/ios/app/audioanalyzerapp/id1434780912) | — | Free | Music |

## More apps by Daniel Bach

- [liveBPM - Beat Detector](https://appshunter.io/ios/app/livebpm-beat-detector/id554766778)

All apps by Daniel Bach: https://appshunter.io/developer/554766781

## Related topics

[frequensee](https://appshunter.io/ios/topics/frequensee)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-31.*