# Dark-Zone

> Dark-Zone (iPhone/iPad app by Knightware, LLC.)

- Source: https://appshunter.io/ios/app/dark-zone/id1375351610 (this page in markdown: same URL + `.md`)
- Developer: [Knightware, LLC](https://appshunter.io/developer/1375351169)
- Category: Utilities
- Price: $0.99
- Age rating: 4+
- Requires: iOS 11.0 · 21 MB
- Languages: English
- Released: 2018-05-14
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/dark-zone/id1375351610/reviews.md

## What is Dark?

Dark Zone allows astronomers and other researchers to convert a sky brightness value to multiple units of measure, and shows the corresponding dark zone color as defined by the New Atlas of Artificial Sky Brightness (2016, Falchi et al). Sky brightness values may be taken from a device (such as Unihedron's Sky Quality Meter), or it may be a visual estimate.

Enter the brightness value as MPSAS, NELM or Mcdpsm, select the unit of measure, and tap Convert. Values are shown in all supported units, and the zone color is shown.

Units of measure are:
Mpsas  = magnitudes per square arcsecond
Nelm   = naked eye limiting magnitude
Mcdpsm = millicandelas per square meter


## Version history (last 1 release)

### 1.0.2 — 2020-06-15

Minor changes that improve app launch.

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## More apps by Knightware, LLC

- [Deep-Sky Planner ME](https://appshunter.io/ios/app/deep-sky-planner-me/id1375351170)

All apps by Knightware, LLC: https://appshunter.io/developer/1375351169

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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 2026-05-19.*