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SIZZAPP documentation is available only in English.
https://www.sizzapp.com/themes/sizzapp/assets/pdf_doc/manual_small.pdf
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SIZZAPP has 2 solutions: one is private and works with SIZZAPP Pro application (Android, IOS) or a Mobile application and a business web or Web app (works via web). if you decide to use the web version, we should change the device configuration, but then we need a company name to create an account for you and we will forward the credentials. Contact us for web application.