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Update a variable in app 1, from app 2.

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Posted on by MrCrow

Hey Brain Squad!

I made a dope flashy cash bash drawing app, uses shuffle to randomly draw tickets and update the list live. However, the cash bash planning team is worried that people will think a digital drawing system could be rigged and wants to still use the bingo ball drawing system they used in the past, but they want a way to type the number drawn in another screen or even a phone app that will update the drawn number so we still have the cool confetti gif/ fanfare sound fun that the app I made brings.

Is it possible that I can update variables on the app that will be displayed on the big screen, with a second power app ran on someone's phone?

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Building Power Apps

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timl 36,682 Super User 2026 Season 1 on at

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Hi @MrCrow

Variables provide in-memory storage of values are scoped at a per-app/per-session level. Therefore, it is not possible to update a variable in app 1 from app 2.

As a workaround, you could save a value to a data store (such as SharePoint) from app 1. In app 2, you can create a timer control that polls for changes in the data store.

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MrCrow 16 on at

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Thanks! How exactly would I create the timer control that polls for data changes? That seems like a pretty good solution!

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MrCrow 16 on at

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For everyone curious!

I made a 10 second timer, and on the timer end I added this:

Refresh('list');
Set(VarDrawCountNew,Max('list','Order drawn'));
If(VarDrawCount<VarDrawCountNew,Select(Draw))

The Select(Draw) just used the button i had originally set up, and I just adjusted the clearcollect to get the number typed in the app instead of randomly selecting a row itself.
So, this timer will refresh the sharepoint list every 10 seconds, and if the highest number in the order drawn column is higher than the current variable of order drawn it will run the draw animations and the winner/loser.

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