What is Gamma Calculator Pro's rating?

Gamma Calculator Pro is rated 4.4 stars across 110 ratings on the Play Store.

Who makes Gamma Calculator Pro?

Gamma Calculator Pro is published by Klwinkel.com, launched on Mar 26, 2015.

Where does Gamma Calculator Pro rank in its category?

Gamma Calculator Pro ranks #501 of 35236 apps in Productivity, putting it in the top 1.4% by revenue.

How much does Gamma Calculator Pro earn?

Q: How much does Gamma Calculator Pro earn?

Gamma Calculator Pro earns approximately 3.2K per month based on bumetric's ML revenue forecast, calibrated against 35236 comparable Android apps in Productivity.

Android app from Klwinkel.com · Productivity

ML forecast ★ 4.4 · 110 Paid

~3.2K/mo

ML revenue forecast. Calibrated against 35236 apps in this category.

Confidence band

±15%

High — many comparable apps with verified data

At a glance

Earns 20.87× more than the category median (151/mo).
Ranks #501 of 35,236 in Productivity (top 1.4% by revenue).
Launched Mar 26, 2015 · last updated Mar 17, 2026.

What the app looks like

Live screenshots from the Play Store, captured by our snapshot worker. Tap any image to enlarge.

Gamma Calculator Pro's revenue trajectory

Forecast revenue from snapshot history. Last 1 months.

Where Gamma Calculator Pro sits in Productivity

Revenue distribution of 35236 comparable apps. Gamma Calculator Pro highlighted.

Gamma Calculator Pro vs comparable apps

Revenue trajectory side-by-side. Bold = Gamma Calculator Pro, ghosted = peers.

App spec

Version

2.8.2

Last update

Mar 17, 2026

Launched

Mar 26, 2015

Price

$3.99

Monetization

Paid

What Gamma Calculator Pro actually does (from store listing)

Save time with this exposure calculator for Iridium-192, Selinium-75 and Cobalt-60 sources. ==> Pro version includes Barricade calculation for 2mR and 100Mr distance. 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.

Comparable Android apps

The five apps in Productivity with the closest revenue to Gamma Calculator Pro. Click any to see its detail page.

App	Revenue	Rating	Ratings
Send Anywhere (File Transfer)	3.2K	★ 4.5	347K
Focus To-Do: Pomodoro & Tasks	3.1K	★ 4.6	278K
WWW Notifier Pro - Web Monitor	3.1K	★ 2.9	116
Sketch Box Pro (Easy Drawing)	3.2K	★ 3.7	189
Image to PDF - PDF Maker	3.1K	★ 4.5	345K

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How we calculated this

Each forecast combines App Store rating, ratings count, monetisation model, pricing tier, IAP signals and ad-supported flag. The base estimate is then multiplied by a per-category scaling factor learned from apps with founder-verified MRR. Every number on this page comes from public APIs and bumetric's own snapshot history.

Full methodology covers input variables, accuracy bands per category and how we treat apps without comparable anchors. See also the live data on Gamma Calculator Pro's tracker page for current rating, reviews and snapshot timeline.

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