I must have tried every available online stock portfolio tracker within the last week. Not one of them ticked all the boxes needed. Most of them wanted login information to my financial institutions (e.g. Personal Capital), pay them per API request (e.g. IEX), or were limited in how many ticker symbols they'd allow (e.g. FinViz). So I made my own...

Turns out that using GoogleFinance as the backend, one could easily develop some JavaScript (source) and embed it into a simple HTML page with CSS. I've since encrypted the source with a key phrase / prompt, so there's not much worry for privacy concerns. Although that wouldn't matter unless anyone wants to know which stocks I invest in.