أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
No there is no individual platform that can combine all your google analytics accounts. That is the reason why we have option to add more analytics properties under 1 analytics account.
If you are just looking to understand the demographics of visitors and what your audience does outside of your website you might use Facebook Pixels & Analytics.
You can use Google Spreadsheet add on to combine data from different GA views into one Google sheet
