Amazing cosmic microwave background all-sky maps on your iPhone and iPad!

This app allows you to see and compare different generations of CMB fluctuations. It includes 4K resolution all-sky COBE/WMAP/Planck CMB maps and allows you to zoom in and scroll around for map details. You can choose to view a single map, or compare multiple maps by tilting your device. A sky reference map is also included to show the galactic coordinates, notable Milky Way components, and microwave point sources.

Cosmic Microwave Background (CMB) is the afterglow radiation from the Big Bang. Its temperature is extremely uniform, but with tiny fluctuations as you will see in these maps. 

In 1992, COBE satellite made the first detection of the CMB fluctuations. The following WMAP and Planck mission were able to scan the sky at better and better resolution. The successes of these CMB observations have provided us great understanding of the Universe over the last decades. Check the Wikipedia page for more details:

This app is designed and made by Qingqing Mao at Vanderbilt University for the purposes of astronomy education and demonstration.

The included CMB maps are generated by NASA and ESA. COBE, WMAP and sky reference image credits: 
NASA / WMAP Science Team. 
Planck image credits: 
ESA and the Planck Collaboration.

Author's personal website:
Suggestions and feedback are very welcome. Please leave your review, or visit author's website for contact information.

Ratings and Reviews

4.6 out of 5
9 Ratings

9 Ratings

Manodeep ,

Zoom and fade between 20+ years of CMB data

Fun tool to look at CMB maps from the 3 major missions. I particularly like the sky reference overlay.

Mbb057 ,

App is GARBAGE!!! Needs to be updated

Am using an iPhone Pro Max with iOS 14.7.1. Now every time I download a new app from the app store, am receiving the message: “CBM Maps needs to be updated.” “The developer of this app needs to update it to work with this version of iOS.” “[Keep] [Delete].”

Have tried deleting, rebooting and a variety of other recommended fixes to no avail; message never goes away. In fairness, this is happening with one other app as well.

ThatgreatHeeyo ,

Love it!

A fantastic for exploring the Universe!

App Privacy

The developer, Qingqing Mao, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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