---
title: "Credits & Attribution | Alpenglow"
description: "The people, data providers, and open-source projects that make Alpenglow possible, from the app icon to the weather data behind every sunrise and sunset forecast."
url: https://alpenglowapp.com/credits
language: en
---

# Credits & Attribution

Alpenglow is built by one person, but it stands on the work of many. These are the people, data providers, and open-source projects that make it possible, listed with thanks.

## App icon

**[Michael Flarup](https://flarup.co/)**

Alpenglow's app icon was designed by Michael Flarup, the Copenhagen-based designer behind Pixel Resort, Apply Pixels, and The iOS App Icon Book. The icon has anchored the app's identity across every platform it has shipped on.

## Forecast data

**[Deutscher Wetterdienst (DWD)](https://www.dwd.de/EN/ourservices/opendata/opendata.html)**

Alpenglow's own forecast model is built on high-resolution data from the ICON weather model, produced and published as open data by Deutscher Wetterdienst, Germany's national meteorological service.

**[SunsetWX](https://sunsetwx.com/)**

For nearly a decade, from the first release in 2016 until the in-house model went live in early 2026, Alpenglow's forecasts were powered by SunsetWX and its NAM- and GFS-based model. Alpenglow would not exist without them.

## Maps

**[Apple Maps](https://developer.apple.com/maps/)**

Maps in the sun direction calculator are provided by Apple Maps via MapKit JS.

## Open-source software & data

**[SunCalc](https://github.com/mourner/suncalc)**

Sun position, sunrise and sunset times, and golden hour and blue hour windows on this site are calculated with SunCalc by Vladimir Agafonkin, released under the BSD-2-Clause license.

**[GeoNames](https://www.geonames.org/)**

The city database behind the forecast, sun times, and sun direction pages is derived from GeoNames (via the cities.json package), licensed under CC BY 4.0.

**[OpenStreetMap contributors](https://www.openstreetmap.org/copyright)**

Time zone lookups use tz-lookup, built on the Timezone Boundary Builder dataset, which is derived from OpenStreetMap data. © OpenStreetMap contributors.

## And you

Every Field Report submitted after a sunrise or sunset helps refine future forecasts. Thank you to everyone who has pointed their camera at the sky and told Alpenglow what it actually looked like.

## Corrections

If something here is miscredited or missing, please [get in touch](https://alpenglowapp.com/contact) and it will be corrected.