"Select Play Partners" can block unofficial installation of their apps.

You might sideload an Android app, or manually install its APK package, if you’re using a custom version of Android that doesn’t include Google’s Play Store. Alternately, the app might be experimental, under development, or perhaps no longer maintained and offered by its developer. Until now, the existence of sideload-ready APKs on the web was something that seemed to be tolerated, if warned against, by Google.

This quiet standstill is being shaken up by a new feature in Google’s Play Integrity API. As reported by Android Authority, developer tools to push “remediation” dialogs during sideloading debuted at Google’s I/O conference in May, have begun showing up on users’ phones. Sideloaders of apps from the British shop Tesco, fandom app BeyBlade X, and ChatGPT have reported “Get this app from Play” prompts, which cannot be worked around. An Android gaming handheld user encountered a similarly worded prompt from Diablo Immortal on their device three months ago.

Google’s Play Integrity API is how apps have previously blocked access when loaded onto phones that are in some way modified from a stock OS with all Google Play integrations intact. Recently, a popular two-factor authentication app blocked access on rooted phones, including the security-minded GrapheneOS. Apps can call the Play Integrity API and get back an “integrity verdict,” relaying if the phone has a “trustworthy” software environment, has Google Play Protect enabled, and passes other software checks.

Graphene has questioned the veracity of Google’s Integrity API and SafetyNet Attestation systems, recommending instead standard Android hardware attestation. Rahman notes that apps do not have to take an all-or-nothing approach to integrity checking. Rather than block installation entirely, apps could call on the API only during sensitive actions, issuing a warning there. But not having a Play Store connection can also deprive developers of metrics, allow for installation on incompatible devices (and resulting bad reviews), and, of course, open the door to paid app piracy.

    • Chozo
      36•4 months ago

      I’ll be real, I wouldn’t trust a banking app from any third-party storefront to begin with. That’s the sort of app I’d really want to be properly vetted and secured.

      • CrisEnglish
        13•4 months ago

        If you’re using a custom de-googled rom you don’t have the play store, so this would just gut that functionality :/ same for any other app that decides they need this, which if the past is anything to go on is going to be a ton of apps that really don’t need it

      • Maeve
        5•4 months ago

        When did Google start verifying security on play?

      • @[email protected]English
        4•4 months ago

        But, there’s no difference in security between using a different storefront? The difference in security depends on the app itself, not where it was downloaded from.

        • Chozo
          12•4 months ago

          Assuming the app is legitimate, sure. But unless you can verify the code, yourself, then you’re having to trust that the source you download from hasn’t altered the APK in some way. That’s a pretty big risk for most people when it comes to finance apps.

          • @mrvictory1English
            2•4 months ago

            APKs are signed, you can verify the integrity of an APK. If you have a previous version of an app installed, a new version with incorrect signature won’t even install.

          • @[email protected]English
            1•4 months ago

            Yeah but I mean if your bank would offer their app through F-Droid as an addition to Google Play, there is no reason to assume the app suddenly got less secure because of that.

      • @QuadratureSurferEnglish
        4•4 months ago

        The features you miss out on would be direct deposit from checks and app notifications (usually there are a few that you want enabled but are only available through the app).

        • @[email protected]English
          5•4 months ago

          Most banks I’ve used allow SMS notifications for things like deposits and purchases.

          The check things is true but I need to use it like less than once a year so eh.

    • @ohwhatfollyismanEnglish
      11•4 months ago

      personally, i wouldn’t trust a third-party created app with my banking details. what’s more, i’ve removed all banking apps from my phone.

      i don’t need to allow access to my finances on the device which is most likely to get pinched out of everything i own. plus google and apple don’t need to know which banks have accounts of mine.

      imo that additional inconvenience to conduct all banking transactions from a browser is worth the candle.