The app asks for nothing, counts nothing, and never nags. If you like it and feel like it, you can leave a tip — and if you don't feel like it, absolutely nothing happens.
Or scan, to pay from your phone
The link simply opens your browser: neither the site nor the app sees your payment, and no account is asked of you.
The Apple developer account that signing requires, the hosting, and the time. Nothing more, nothing less. There is no paid version hiding behind it: what you download is the whole app.
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