# RTA01 — Real-Time Spectrum Analyzer

> Real-Time Spectrum Analyzer (iPhone/iPad app by Shunsuke Takasu.)

- Source: https://appshunter.io/ios/app/rta01/id6793456897 (this page in markdown: same URL + `.md`)
- Developer: [Shunsuke Takasu](https://appshunter.io/developer/6788974380)
- Category: Utilities, Music
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.6 · 3 MB
- Languages: American English, Japanese
- Released: 2026-07-27
- Data updated: 2026-07-29
- User reviews in markdown: https://appshunter.io/ios/app/rta01/id6793456897/reviews.md

## What is RTA01?

RTA is a pocket-sized real-time spectrum analyzer built for audio engineers and PA operators.

FEATURES
- Switchable resolution: 31, 63, or 127 bands
- A/C/Z frequency weighting (IEC 61672-1 compliant)
- High-precision peak detection using raw FFT data with parabolic interpolation
- Peak hold
- Calibration offset (for matching a reference measurement device)
- Tap any band to see its exact frequency and dB level
- Upside-down mode for inverted mounting
- Multiple color themes (Black / White / Neon / B&W)

NO ADS, NO PRESSURE
This app has no interruptive ads. If you find it useful, you can support development with an optional tip.

Handy for quick frequency balance checks and finding feedback points in the field.

Note: readings are for relative reference only and are not guaranteed to match a calibrated measurement instrument.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| A roll of vinyl tape | $0.99 | one-time |
| A roll of gaffer tape | $1.99 | one-time |
| Tip - XLR Connector | $6.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-07-27

No release notes.

## More apps by Shunsuke Takasu

- [Feedback Trainer](https://appshunter.io/ios/app/feedback-trainer/id6788974378)

All apps by Shunsuke Takasu: https://appshunter.io/developer/6788974380

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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 2026-07-29.*