Are the sample apps secure apps?

[yumei]

Bottom line: Can I trust the sample apps? Do sample apps get scrutinized before being listed?

[AleksiAlkio]

If you mean public sample apps, they don't need authentication.. which means who ever can open the app and see all the data.

[Aurelien]

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@yumei wrote:

Do sample apps get scrutinized before being listed?

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No. Anyone can create a sample app. 

Here is an excellent tip, for information:  How to share your app as a template / sample app v... - Google Cloud Community