Ok, I totally missed that you said article and collection in the title. Lol. Oops
For iOS you need to have a developer account so you can create the mobileprovision file and certificates to sign and install the preview app. For Android you do need to have a certificate to sign it, but you don't need a developer account to do that. You can generate a certificate using the keytool app that comes with Java, sign your preview .apk file, and install that on your Android device.