I spent a weekend building a dashboard for myself because I was sick of checking 30 sites one by one. Turns out that was the actual product.
The specific thing that broke me: every Monday I'd open GA4 for each property, wait for it to load, try to remember whether last week was better or worse, then move to the next one. Fourteen sites meant fourteen tabs, fourteen context switches, and by the time I finished I couldn't actually compare anything.
So I built a read-only view pulling all my sites' GA4 and Search Console data into one screen. What I ended up using most wasn't the overview -- it was the weekly digest that ranks sites by how much impressions dropped. That feature told me a site I hadn't touched in three months had lost 40% of traffic while I wasn't watching.
A few things that didn't go well: the dashboard only shows what your tracking actually captures, so if your GA4 properties are misconfigured (mine were), the data is wrong too. I spent two weeks fixing analytics before the tool became useful. Also, connecting 14 properties one at a time through Google OAuth is tedious. I'm still looking for a better way to handle that.
Currently in early access. If you manage more than five or six sites and find yourself doing the same tab-switching routine on Mondays, it might be worth a look: multisiteseo.com
I like that the biggest value wasn't another dashboard—it was surfacing what actually needed attention. Ranking sites by change instead of making you inspect every metric manually turns monitoring into decision-making, which feels much more useful than just aggregating analytics.