# ZAO RTC-1 Calculator — Musical Compression Toolkit

> Musical Compression Toolkit (iPhone/iPad app by Chad Wright.)

- Source: https://appshunter.io/ios/app/zao-rtc-1-calculator/id6753323580 (this page in markdown: same URL + `.md`)
- Developer: [Chad Wright](https://appshunter.io/developer/1511686458)
- Category: Music, Utilities
- Price: $4.99 with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 54 MB
- Languages: American English
- Released: 2025-10-03
- Data updated: 2026-10-28

## What is ZAO RTC?

ZAO RTC-1 is a musical timing and compression workspace for producers, engineers, musicians, and students. Enter or tap a tempo, choose a note value, and turn BPM into practical attack and release timing.

CALCULATE MUSICAL TIME

Convert tempo and note values into milliseconds, seconds, and microseconds. Save useful results and recall them when a session needs them.

HEAR WHAT THE COMPRESSOR IS DOING

Compression Lab makes attack, release, ratio, threshold, and level matching easier to understand. Audition musical sources while adjusting controls, switch between free movement and tempo-based note-grid timing, and see clear explanations of the result.

EXPLORE 21 RTC-1 DEVICE MODELS

The Device Rack translates RTC-1 timing into calibrated control positions across 21 original RTC-1 dynamics models. Each model has a neutral public identity, an original RTC-1 faceplate, and controls aligned with its supported behavior.

ASK RTC-1 AI

Describe the source and the sound you want. RTC-1 AI can suggest a starting point, explain the reasoning, and map supported settings to the selected RTC-1 device model. Recommendations are starting points—your recording and your ears remain the final authority.

BUILD YOUR WORKSPACE

On Mac, open the Calculator, Compression Lab, Device Rack, and AI Assistant together or separately. Detach sections into resizable windows, arrange them across displays, and return to the last workspace configuration.

Additional features include tempo following, note-grid attack and release, uninterrupted loop auditioning, numeric make-up level feedback, save and recall, responsive layouts, themes, haptics, and button-sound controls.

RTC-1 Pro is available as a one-time in-app purchase. RTC-1 AI is available by auto-renewable monthly or annual subscription and includes the complete Device Rack while active. Prices and availability are shown by Apple for your country or region.

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

## Pricing and in-app purchases

Base price: $4.99.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| RTC-1 AI Annual | $49.99 | per year |
| RTC-1 AI Monthly | $5.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| RTC-1 Pro Device Rack | $24.99 | one-time |


## Is ZAO RTC safe?

Not enough ratings yet to assess ZAO RTC.

## Is ZAO RTC legit?

ZAO RTC-1 Calculator appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for ZAO RTC is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 3 releases)

### 4 — 2026-10-01

Version 4 transforms RTC-1 into a complete musical compression workspace.

• New tempo-aware Compression Lab with Note Grid attack and release timing.
• Uninterrupted audio auditioning while controls are adjusted.
• Clear Dry, Compressed, and Delta monitoring with visible Auto Make-Up Gain.
• A complete 21-model Device Rack with calibrated control translations.
• RTC-1 AI starting-point guidance and device mapping.
• Full Studio and detachable, resizable multi-window workflows on Mac.
• External-keyboard support and smoother Calculator-to-Device swiping on iPhone.

### 3.1 — 2026-07-17

Background display correction.

### 3.0 — 2025-10-03

No release notes.

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## More apps by Chad Wright

- [ZAO Release-Time Calculator](https://appshunter.io/ios/app/zao-release-time-calculator/id1511686459)

All apps by Chad Wright: https://appshunter.io/developer/1511686458

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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 2026-10-28.*