Substratum

Use Substratum swift black theme on my S8 and love it. Taking a break from it right now because I'm doing the Oreo Beta and didn't want to complicate things.
 
it's a theme different than Samsung themes it addresses the internal workings....like the calendar...email...my Google now page is all black background
 
Using an all-black theme on Android Oreo on my Nokia 8 currently, without the need to root. Absolutely love the aesthetics. As the member above said, it takes Samsung themes to a whole new level by theming out some apps that Samsung themes don't, like Google Voice and Gmail, and even parts of the Google app itself.
 
I'm using the Swift Black Substratum theme. I'm loving the black Google search on my home screen. I reduced it to a circle.
 
Using an all-black theme on Android Oreo on my Nokia 8 currently, without the need to root. Absolutely love the aesthetics. As the member above said, it takes Samsung themes to a whole new level by theming out some apps that Samsung themes don't, like Google Voice and Gmail, and even parts of the Google app itself.

Substratum paired with Nova Launcher
 

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substratum looks interesting, but it seems kinda complex. Where can I go to get a complete over view and instructions, for it.

I also noticed, though I could be wrong. That the app needs your Samsung account information. Why does the substratum need such information and how does such info affect privacy.
 
After reading about Substratum on AC's front page, I downloaded the necessary things off the play store to give it a try on my S8 (substratum, sungstratum, and swift black theme). When I followed the steps to install the theme, i was prompted to enable ability in settings to allow installing apps from unknown sources. Perhaps I'm missing something, but I don't understand why I would need to do this for apps that were downloaded from the play store? Because of this, I decided to uninstall the app and theme from my phone. Can somebody explain why it would need to have this enabled to install a theme from the play store?
 
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After reading about Substratum on AC's front page, I downloaded the necessary things off the play store to give it a try on my S8 (substratum, sungstratum, and swift black theme). When I followed the steps to install the theme, i was prompted to enable ability in settings to allow installing apps from unknown sources. Perhaps I'm missing something, but I don't understand why I would need to do this for apps that were downloaded from the play store? Because of this, I decided to uninstall the app and theme from my phone. Can somebody explain why it would need to have this enabled to install a theme from the play store?

Correct me of I'm wrong, but I believe the app needs to install additional components not in the app in the Play Store. When downloaded through the app itself it then needs permission to install.
 
I used a dark theme and set the clock to the center of the status bar. Got rid of it after an update broke it. All I was left with was a dark screen with a notification box that my system UI stopped working. I had to use bloody bixby (which took 15 minutes to finally understand my voice password) to fix things and get rid off everything substratum related.
 
Correct me of I'm wrong, but I believe the app needs to install additional components not in the app in the Play Store. When downloaded through the app itself it then needs permission to install.
Thanks for the response. Seems like they could just include whatever extras it is downloading from 'unknown sources' to the play store download. Oh well. Looks cool and all, but I guess I will just stick with the Samsung Themes app.