# AudioEngineerToolkit — dB, delay, phase, RT60, BPM

> dB, delay, phase, RT60, BPM (iPhone/iPad app by HYO SEOP LEE.)

- Source: https://appshunter.io/ios/app/audioengineertoolkit/id6794612792 (this page in markdown: same URL + `.md`)
- Developer: [HYO SEOP LEE](https://appshunter.io/developer/6790621758)
- Category: Utilities, Music
- Price: $4.99
- Age rating: 4+
- Requires: iOS 26.5 · 1 MB
- Languages: Korean, European Spanish, American English, Japanese, Chinese (Simplified, China)
- Released: 2026-07-25
- Data updated: 2026-09-04
- User reviews in markdown: https://appshunter.io/ios/app/audioengineertoolkit/id6794612792/reviews.md

## What is AudioEngineerToolkit?

A complete set of offline calculators for audio engineers — on stage, in the studio, no internet required. No login, no ads, no tracking.

■ Electrical
· Ohm's Law calculator
· Power calculator
· Speaker impedance (series/parallel)
· dB ↔ power ratio converter

■ Delay
· Distance ↔ Time ↔ Phase
· Haas Effect zone finder
· Multi-zone speaker delay alignment
· BPM-based reverb pre-delay

■ Acoustics
· Frequency ↔ Period ↔ Wavelength ↔ Quarter-wavelength
· Octave band calculator
· Distance ↔ time delay
· Room volume calculator
· Room mode calculator
· RT60 reverberation time

■ Tempo & Pitch
· Tap tempo (BPM) finder
· Note length calculator
· Playback speed ↔ pitch converter (turntable-style)
· Loop BPM finder
· Bar duration calculator
· Sample rate / buffer size latency calculator


Keep your go-to calculators in the Favorites tab and open them in one tap.

Available in Korean, English, Japanese, Spanish, and Simplified Chinese. Runs on iPhone, iPad, Mac


## Version history (last 3 releases)

### 1.1.1 — 2026-08-29

• Favorites — star the calculators you use most and open them in one tap from the new Favorites tab.
• iPad & Mac layout, redesigned — comfortable reading width, bigger text, and cleaner tool pickers on larger screens.
• Various bug fixes.

Still no login, no ads, no tracking.

### 1.1 — 2026-07-29

Added a new practice quiz feature to test your calculations. Also improved the numeric keyboard experience with a new Done button for easier dismissal, along with better touch responsiveness and calculation accuracy on several screens.

### 1.0 — 2026-07-25

No release notes.

## More apps by HYO SEOP LEE

- [AET Quiz](https://appshunter.io/ios/app/aet-quiz/id6797225714)
- [무대음향 자격증 기출문제](https://appshunter.io/ios/app/id6798884217)
- [AudioEngineerKit: SPL & RTA](https://appshunter.io/ios/app/audioengineerkit-spl-and-rta/id6801498086)
- [AudioEngineer EAR Trainer](https://appshunter.io/ios/app/audioengineer-ear-trainer/id6801893036)
- [DAW 단축키 — 키맵](https://appshunter.io/ios/app/daw/id6806570824)

All apps by HYO SEOP LEE: https://appshunter.io/developer/6790621758

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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 2026-09-04.*