To keep track of investment performance I use the open source tool PortfolioPerformance. It’s stored locally and not in the cloud (like an excel sheet) and gives a pretty nice interface with stats and graphs. (See: https://portfolio-performance.info). Source: about 2 years ago

Https://stonksfolio.com and https://www.portfolio-performance.info look promising. Source: 9 months ago

Https://stonksfolio.com terrible name, but I'll check it out anyway. Source: 9 months ago

I've been using https://stonksfolio.com/ for quite some time now, it's exactly what you are looking for. They have a trial as well so you can check if that's the right tool for you, but for me it was simple and exactly what I needed. Source: about 1 year ago

If you want something more comprehensive, try this: https://stonksfolio.com/. Source: almost 2 years ago

Https://stonksfolio.com I started it to track my all my investment accounts in one place and a couple of years ago decided to open it up to the public. Active users are in the hundreds but not growing rapidly. Tried to monetize it with Patreon but only 2 people actually subscribed. It's a fun project to work on, though, and not having paying customers allows me to ignore it until I get the enthusiasm to work on it... - Source: Hacker News / over 2 years ago