Do I need an app?
No: a Portal opens in your phone’s own browser, so there is nothing to download, now or later.
Every modern phone reads a tag on its own. Hold it to the tag and the page opens, the same way a link would.
On some older iPhones, open Control Centre and choose the tag reader first.
If the page offers it, you can add it to your Home Screen so it opens like an app. That is optional and still nothing to download.
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