# VZT Montér: HVAC ductwork — Offset, elbow, spiral duct

> Offset, elbow, spiral duct (iPhone/iPad app by deriverge s.r.o..)

- Source: https://appshunter.io/ios/app/vzt-monter-hvac-ductwork/id6806400438 (this page in markdown: same URL + `.md`)
- Developer: [deriverge s.r.o.](https://appshunter.io/developer/6806400440)
- Category: Utilities, Business
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.4 · 55 MB
- Languages: American English, Czech, German (Germany), Polish, Slovak
- Released: 2026-09-10
- Data updated: 2026-10-18

## What is VZT Montér?

VZT Montér is a calculator for the guys on the tools who build ductwork by hand. Nothing extra: put in what you measured with a tape, get out what you write on the duct.

FREE
- Planar offset on spiral duct: filler length, diagonal, centre distance. The elbow radius is taken from the diameter automatically.
- Rectangular duct: offsets for radiused, mitred and vaned mitred elbows.
- Conversions: round to rectangular, flow, room flow requirement.
- Calculation history: tap an old calculation and carry straight on with it.
- Work log: one tap to log the hours for a day, set your rate and see the month's earnings. First 14 days free.
- Backup to a file. Everything works offline, no sign-up.

PRO (one-time purchase, no subscription)
- Rolling offset and offset around an obstacle.
- Miter cuts and sheet development with a 1:1 print template.
- Route design and pressure losses.
- Custom elbow angles.
- PDF without a watermark, unlimited jobs.
- Unlimited work log, site photos and a PDF hours report for the foreman.

Day mode is deliberately black and white so you can read it in the sun. Night mode for the plant room. Big buttons so it works with gloves on.

Built with installers, the way installers work. If something does not fit, write to info@deriverge.com and we will fix it.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| VZT Montér PRO | $9.99 | one-time |


## Is VZT Montér safe?

Not enough ratings yet to assess VZT Montér.

## Is VZT Montér legit?

VZT Montér: HVAC ductwork has limited verification signals. The AppsHunter Legitimacy Score for VZT Montér is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 4 releases)

### 1.2.2 — 2026-09-21

The angle wheel no longer opens the keypad: just swipe and the value is set. Manual entry stays on the Custom row. While typing, the screen scrolls so the field you are editing stays visible above the keypad.

### 1.2 — 2026-09-12

New in version 1.2:
- The intro screens now also present the Work log – a daily timesheet with hours, pay and a PDF report.
- New quick tour: after the first install it walks you through the modules, the PRO version, Jobs, Work log and Settings in five steps. Run it again any time from Settings → About.

### 1.1 — 2026-09-11

A cleaner app based on your feedback:
- Back button top left on every screen.
- More space between buttons and text, larger titles.
- Shorter, clearer module descriptions.
- Cleaner PRO page – four bullet points instead of a wall of text.
- Job detail tabs in one scrollable row.
- Fixed wording on the intro screens (1:1 template to print).

### 1.0 — 2026-09-10

No release notes.

## Apps similar to VZT Montér

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## More apps by deriverge s.r.o.

- [Tapkasa - Pop-up Point of Sale](https://appshunter.io/ios/app/tapkasa-pop-up-point-of-sale/id6807075649)

All apps by deriverge s.r.o.: https://appshunter.io/developer/6806400440

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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 2026-10-18.*