# iSmartESA — Smart Easy Sound Analyzer

> Smart Easy Sound Analyzer (iPhone/iPad app by Hiroshi Nakano.)

- Source: https://appshunter.io/ios/app/ismartesa/id1579688964 (this page in markdown: same URL + `.md`)
- Developer: [Hiroshi Nakano](https://appshunter.io/developer/1529446216)
- Category: Education, Utilities
- Price: $3.99
- Age rating: 4+
- Requires: iOS 14.1 · 3 MB
- Languages: American English, Japanese
- Released: 2021-08-12
- Data updated: 2026-08-21
- User reviews in markdown: https://appshunter.io/ios/app/ismartesa/id1579688964/reviews.md

## What is iSmartESA?

Sound acquisition is endlessly done from the smartphone's built-in microphone or external microphone at a sampling frequency of 44100Hz, and the last 20 seconds are recorded when the recording button is pressed. The frequency display range can be selected from 0-500Hz, 0-1kHz, 0-2kHz, 0-5kHz, 0-10kHz, and 0-20kHz.

Analysis: Waveform (time axis expansion and contraction, envelope), FFT spectrum. In case of voice sound analysis, the app can determine the fundamental frequency (by cepstrum) and formant frequencies (by MEM). In addition to being able to select any section for these analyzes, it is also possible to observe while playing back the sound.

Sound pressure level and frequency: During measurement, the moving average sound pressure level for one second is displayed (A-weighted value). This function may be used to measure environmental noise. The value is adjusted for a specific microphone: SONY ECM-SP10, but the accuracy is not guaranteed.  Also, during the measurement, the peak frequency (The frequency range to be detected is set on the setting screen) is displayed.

Files: You can save the recorded sound as a file with comments. Sharing function is available.


## Version history (last 5 releases)

### 1.9 — 2026-07-08

This version fixes an issue where the playback volume was low, making faint sounds difficult to hear. Adjustments have also been made to better align the measured values ​​with those obtained using a sound level meter.

### 1.81 — 2026-02-01

To prevent overrange during loud sound measurements when using an external microphone, the attenuate button has been expanded to two levels: -12 dB and -30 dB. This has widened the range of measurable sound pressure.

### 1.7 — 2024-10-29

In this version, recorded sound can be played repeatedly and stopped at any point.
The analysis window width on the spectrum analysis screen can now be expanded or contracted.

### 1.6 — 2023-06-24

In this version,
1. Spectrogram image display has been speeded up.
2. Improved file sharing and deletion user interface
3. Flattened the gain characteristics of IIR filters (LPF, HPF) in the passband.
4. Also added the function of FFT filter
5. Corrected inaccuracies in cepstrum analysis and added spectral envelope display

### 1.5 — 2023-06-03

1) Improved to detect and display overrange during sound recording.
2) In environments where it is possible to change the microphone input gain, such as an external microphone or an iPad, a new button to reduce the gain by 12dB will appear.
3) Added analysis function of time domain waveform.
  - You can set the cutoff frequency and the order of the low pass filter and high pass filter. This filter is also reflected in the playback of the sound, so you can, for example, remove the low frequencies and hear the desired high frequency sounds.
 - Envelopes can be generated by Hilbert transform.
 - Added pulse counter function.

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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 2026-08-21.*