# SpectrumAnalyzer: FFT Overlay

> SpectrumAnalyzer: FFT Overlay (iPhone/iPad app by Eiji Chiba.)

- Source: https://appshunter.io/ios/app/spectrumanalyzer-fft-overlay/id6790409622 (this page in markdown: same URL + `.md`)
- Developer: [Eiji Chiba](https://appshunter.io/developer/1818574673)
- Category: Utilities, Music
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 26.5 · 7 MB
- Languages: English, Japanese
- Released: 2026-07-15
- Data updated: 2026-11-10

## What is SpectrumAnalyzer?

[About the App]
"SpectrumAnalyzer" is an advanced audio DSP visualizer that analyzes and visualizes live microphone input and audio files with high precision.
Powered by Fast Fourier Transform (FFT) frequency analysis and a sleek, intuitive dark-themed user interface, anyone—from audio engineers and musicians to curious everyday users—can effortlessly observe and compare the "shape of sound."

[Key Features]
■ Real-Time Visualization
- Time Domain (Waveform): Displays sound amplitude fluctuations in real time as a waveform.
- Frequency Domain (Spectrum): Analyzes and visualizes the frequency components contained in the sound.
- Dual Display (Both): Shows the waveform and spectrum stacked vertically for a comprehensive view of sound behavior.

■ Pro-Grade DSP Parameters
- Selectable FFT Size: Choose resolution from 512, 1024, 2048, or 4096 samples.
- Window Functions: Supports None (Rectangular), Hann, Hamming, and Blackman windows.
- Frequency Weighting: Switch between flat "Z-Weighting," human-hearing-matched "A-Weighting," and noise-evaluation "C-Weighting."

■ Snapshot Saving & Overlay Comparison
- Instantly calculate the overall average spectrum from microphone measurements or recordings and save it as a named snapshot.
- Overlay saved spectra onto the real-time analysis graph to easily compare frequency responses across different sound sources or before/after adjustments.
- Freely customize graph line colors for each snapshot (supports preset colors and a custom color picker).
- Preview and play back recorded audio right on the spot.

■ Audio File Import & Analysis
- Import and analyze audio files (WAV / MP3 / AAC / M4A, etc.) from your device or iCloud Drive.
- Save imported audio files as snapshots to overlay, compare, and audition alongside real-time microphone measurements.

[Recommended Use Cases]
- Audio Equipment & Speaker Tuning: Measure room acoustics and compare frequency balance before and after adjustments.
- Musical Instrument Practice & Tuning: Visually check harmonic structures, verify pitch, and compare with reference tracks.
- Vocal Training & Practice: Analyze the frequency characteristics of your own voice.
- Environmental Sound & Noise Investigation: Identify which frequency bands ambient noise is coming from.

[About Spectrum Analyzer Pro]
Core real-time analysis, DSP parameter customization, audio file analysis, and comparison with up to 1 snapshot are all available for free.
For users looking for even more advanced analysis, we offer the Pro Plan (Monthly Subscription / Lifetime Unlock).
- Unlimited Overlay Comparisons: Remove the free plan limit (up to 1 snapshot) and overlay multiple measurement snapshots and audio files simultaneously without limits.
- Ad-Free Experience: Remove all banner and interstitial ads for a clean, distraction-free acoustic analysis environment.
* Subscriptions renew automatically unless canceled at least 24 hours before the end of the current billing period, and your Apple ID account will be charged. You can manage or cancel your subscription anytime in iOS "Settings" > "Apple ID" > "Subscriptions."

[Links]
Terms of Use (EULA):
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Proプラン (月額) | $0.49 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Proプラン (買い切り永久版) | $9.99 | one-time |


## Is SpectrumAnalyzer safe?

Not enough ratings yet to assess SpectrumAnalyzer.

## Is SpectrumAnalyzer legit?

SpectrumAnalyzer: FFT Overlay appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for SpectrumAnalyzer is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 4 releases)

### 1.3 — 2026-11-08

Supports English display (localization)
UI improvements

### 1.2 — 2026-10-20

【新機能・改善内容】
・音声ファイルの読み込み解析に対応：「ファイル」タブから手持ちのオーディオファイル（WAV / MP3 / AAC / M4A等）を取り込み、スペクトル解析や試聴再生ができるようになりました。
・スナップショット管理＆カラーカスタマイズ：測定データやファイル解析結果に名前を付けて保存し、グラフの描画カラーを自由に変更・切り替えられる比較管理機能を追加しました。
・UIデザインの刷新：タブバー構造（「解析」「ファイル」「設定」）を採用し、DSPパラメータや比較チップをより直感的に操作できるよう改善しました。
・Spectrum Analyzer Pro プランの追加：複数のスナップショットを制限なしで同時に重ね合わせ比較できる機能と、広告の完全非表示オプションを追加しました。

### 1.1 — 2026-07-16

広告を追加

### 1.0 — 2026-07-16

No release notes.

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## More apps by Eiji Chiba

- [Tone Generator](https://appshunter.io/ios/app/tone-generator/id6746802859)
- [ToneQuiz](https://appshunter.io/ios/app/tonequiz/id6752510280)
- [Multiple Tone Gen](https://appshunter.io/ios/app/multiple-tone-gen/id6755821745)
- [My Routine Scheduler](https://appshunter.io/ios/app/my-routine-scheduler/id6774161641)

All apps by Eiji Chiba: https://appshunter.io/developer/1818574673

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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 2026-11-10.*