---
title: "Gamma Calculator Pro Revenue & Downloads"
description: "Analyze Gamma Calculator Pro app's download estimates and rankings among ios apps. Estimates updated daily."
url: https://trendapps.dev/app/ios/867478383/
markdown: https://trendapps.dev/app/ios/867478383/index.md
platform: iOS
updated: 2026-09-22
source: TrendApps
license: CC BY 4.0
---

# Gamma Calculator Pro

by Gerrit kleyn Winkel · iOS · Business

## Key metrics

| Metric | Value |
| --- | --- |
| Monthly revenue (store, estimated) | $0 |
| Monthly downloads (estimated) | <3k |
| Rating | 3.6★ (<3k ratings) |
| Price | $3.99 |
| In-app purchases | No |
| Category | Business |
| Top paid rank | #16 in Business |
| First seen on the store | May 5, 2014 |
| Last data update | 2026-09-22 |

## Summary

Gamma Calculator Pro iOS app has established itself as a seasoned player with proven staying power in the mobile app category. Over 12 years since launch, it has accumulated 19 reviews and built its current revenue stream. The app maintains a 3.6-star rating. This Netherlands application.

## Briefing

Gamma Calculator Pro is an iOS app ($3.99) by Gerrit kleyn Winkel in the business category, holding #16 in the paid business charts. It holds a 3.6-star rating.

- A paid app priced at $3.99.
- Ships new versions a few a year.
- Latest version is 2.7.1, released March 20, 2026.
- 47% of ratings are five-star.
- Available in 1 language.
- Strongest in US, IT, KR.
- Downloads at 2.9 MB and requires iOS 18.6+.
- Rated 18+.

## Specs

| Spec | Value |
| --- | --- |
| Version | 2.7.1 |
| Release status | Worldwide |
| Age rating | 18+ |
| Requires | iOS 18.6+ |
| Size | 2.9 MB |
| Languages | English |
| Price | $3.99 |
| First seen | May 2014 |
| Top markets | US, IT, KR |
| Publisher country | Netherlands |
| Support | [Visit support](http://www.klwinkel.com) |

## What's new

| Version | Date |
| --- | --- |
| 2.7.1 | March 20, 2026 |
| 2.7.0 | March 11, 2026 |
| 2.6.2 | May 16, 2025 |
| 2.6.1 | May 6, 2024 |
| 2.6 | March 12, 2024 |

## Featured reviews

- **4★ · Works well · December 16, 2023** — The app works well on IPhone if you know what you’re doing and double checking it. There are a few mistakes with the schedule thicknesses in the calculator where some measurements are missing decimal places in front so the distance is over a hundred feet.
- **5★ · A reliable app for I-phone · December 7, 2024** — Between this app and another calculator app (x-ray_timer) I would say my whole shop uses this app for anyone that owns an I-phone. What drives me crazy is when you initially want to change the curie amount and the line always starts in the front of the initial number. Just an extra step moving the line to select the initial number and change it. We use this app every week here in Kansas.
- **4★ · Requested changes · February 22, 2024** — Can you please add the R factor for D3. Also could you please make it so that the SFD and other measurements that need to be precise don’t round up or down?

## About

Save time with this exposure calculator for Iridium-192, Selinium-75 and Cobalt-60 sources.
No more need to calculate the formula or use of the "old-school plastic calculator"
Simply fill in the thickness, activity(in Curies) and source-film-distance and you get the correct exposure time.

R factor for different densities and film types.

For materials: Iron(steel), Concrete, Tungsten, Lead, Aluminum, Titanium, Copper, Zinc, Brass, Inconel X, Zirconium and Uranium.

Features:

- Exposure Time calculator
- Geometric Unsharpness calculator
- Exposure Correction calculator
- Decay calculator
- Barricade calculator
- Pipe Schedule selector (single/double wall)
- Weld enforcement setting
- Iridium 192 Emissivity setting
- inch/mm setting

## Questions about this app

### What are Gamma Calculator Pro iOS app's download statistics?

Gamma Calculator Pro iOS app is available. The app maintains a 3.6-star rating based on 19 user reviews, indicating decent user acceptance in the mobile app market.

### Is Gamma Calculator Pro iOS app performing well in its category?

Gamma Calculator Pro iOS app competes actively in the mobile app category.

### Where can I download Gamma Calculator Pro iOS app?

You can download Gamma Calculator Pro iOS app from the App Store for iOS devices, requiring iOS 18.6 or later. The app provides its core features without requiring in-app purchases.

## Links

- [App Store page](https://apps.apple.com/app/id867478383)
- [Gerrit kleyn Winkel on TrendApps](https://trendapps.dev/publisher/797512757/)
- [Top Business apps on iOS](https://trendapps.dev/top-trending-apps/ios/business/)
- [App economics statistics](https://trendapps.dev/statistics/)

Source: https://trendapps.dev/app/ios/867478383/ · Markdown: https://trendapps.dev/app/ios/867478383/index.md · Methodology: https://trendapps.dev/methodology/