iMass calculates the molar mass (also called molar weight) of any molecule or compound given its chemical formula. It also displays its elemental composition (% carbon, % oxygen, etc.) as a pie chart.

It also displays the isotopic pattern and calculates the isotopic distribution, as well as monoisotopic mass and most probable mass.

What’s New

Version 1.4

Update for full support of the latest version of macOS, and dark mode

Ratings and Reviews

2.0 out of 5
1 Rating

1 Rating

Tomas D R ,

Very basic app, missing features and lacking support

I was fairly disappointed with the app. There app is missing the support for simulation of partially labelled molecules (eg. CxOyH{10-z}D{z}, where z is for example 0.9}. Customer support was not helpful when I contacted them.

As it is now I spent the money just to try it and find it no better than some free websites. Please improve. The very old PPC version was much better.

App Privacy

The developer, Mobile Science Apps, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

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


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.