Should I have multiple websites for my different brands or one main website with different tabs/areas?

[WhitewallGlasgow]

My client creates apps. As well as the apps they create themselves, they have made some of their own that cover various different topics. Currently they have individual websites for each of these apps, and a website for their app making business.

They are asking whether they should just have one website - their app building site, which also includes information about the two apps they've built themselves.

My feeling is it's better to keep them separate. The app building site is trying to appeal to a B2B audience and gain business to build new apps. AppA is trying to help carehomes and carers to streamline their business, and AppB is trying to help workplace and employee welfare. Combining them all will mean lots of mixed messaging/keywords even if we have dedicated areas on the site. I also think it will limit how much content we can create on each without being completely overwhelming for the user.

If we keep them all separate then we can have a very clear user journey. I would of course recommend having blog posts or some sort of landing page to link to AppA and AppB's websites.

Thoughts? Thank you!