If they are British stocks, I really like the performance tables on This Is Money. You can check both FTSE and AIM and can get all sorts of info about financial fundamentals, broker views, latest trades, director deals, etc. Absolutely free:
For dividends, dividenddata.co.uk is brilliant. If you don’t find the company in the list, it will usually be because they’ve not yet declared but you can search for it and get historical data. Again, absolutely free:
https://www.dividenddata.co.uk/
EDIT - not sure how to get rid of the annoying big window for one and not the other but hopefully makes the point anyway.