Modify OnlyOffice app styles to totally custom ones

I was looking at the playground for OnlyOffice apps online here - Playground | ONLYOFFICE. The demos looks promising, like the one here: ONLYOFFICE Api Documentation.

What our sitiation is - the styles and overall presentation are pretty similar to MS Office and virtually indistinguishable. We want to reuse the same component in our webpage, but with totally different styles for every element - from context menu to ribbon styling, iconography, etc.

Is it possible (or permissible) to modify the styling and on occasions, functionality, in the React code for these modules/apps as per our needs and host the same on our website as a product offering, backed by our own cloud?

Hello @donboscow

There is an article on customization available in API: Customization - Standard branding | ONLYOFFICE
Other than that, I’m afraid there are no other possibilities for customization.

Hello, what if are using a paid version or commercial version of OnlyOffice? Even then we cannot customise the app styling as per our own design system?

Extended licensing provides following customization options: Customization - White label | ONLYOFFICE
If you are looking for a way to change interface theme in your instance of Document Server, then please refer to this article: Changing interface themes in ONLYOFFICE Docs