# D1 Toolbox — Service toolkit for D1 Systems

> Service toolkit for D1 Systems (iPhone/iPad app by Manuel Knakowski.)

- Source: https://appshunter.io/ios/app/d1-toolbox/id6795293872 (this page in markdown: same URL + `.md`)
- Developer: [Manuel Knakowski](https://appshunter.io/developer/6795293874)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 10 MB
- Languages: American English, German (Germany)
- Released: 2026-08-27
- Data updated: 2026-09-01
- User reviews in markdown: https://appshunter.io/ios/app/d1-toolbox/id6795293872/reviews.md

## What is D1 Toolbox?

D1 Toolbox helps trained service technicians work with compatible D1 voice alarm and public address systems.

The app brings system data, measurements and service functions together in a clear project structure. Multiple DOMs remain assigned to the correct building, even when different systems use the same IP addresses.

Features:

• Discover DOMs on the local network or add them manually  
• Import VCF files and keep system data available offline  
• Read the VCF directly from a connected DOM and save it locally  
• Understand lines, call stations, function keys, calls and destination groups  
• Read impedance values, calibrate reference values and compare measurement history  
• Assess event lists together with line and device information  
• Prepare settings safely with guided parameter forms  
• Create and export on-site VCF backups  
• Document maintenance sessions, system checks and LED lamp tests  
• Generate clean PDF reports with selectable data sections

Projects, credentials and data read from the system are stored locally on the iPhone or iPad. The app has no user account, advertising or tracking.

D1 Toolbox is intended exclusively for qualified and authorised technicians. It does not replace the manufacturer’s documentation, required test procedures, approvals or safety measures.

Independent service tool. Not an official application of the system manufacturer. VARIODYN and ESSER are trademarks of their respective owners.

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 |
| --- | --- | --- |
| D1 Toolbox Pro – Monthly | $8.99 | per month |
| D1 Toolbox Pro – 6 Months | $44.99 | per 6 months |
| D1 Toolbox Pro – Yearly | $69.99 | per year |



## Version history (last 1 release)

### 1.2 — 2026-08-27

No release notes.

## More apps by Manuel Knakowski

- [FYRAVUE](https://appshunter.io/ios/app/fyravue/id6802103055)

All apps by Manuel Knakowski: https://appshunter.io/developer/6795293874

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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 2026-09-01.*