Here's pathbuilder's website for a DNDbeyond equivalent for Pathfinder 2e.
Here's the 1e version of pathfinder (1e is my absolute favorite version of the game cause of the customization players and DMs get!) it's only a phone app, but I swear there's a browser version too.
https://play.google.com/store/apps/details?id=com.redrazors.pathbuilder&pcampaignid=web_share
Also Paizo teamed up with Nethys Archive to host all of their rules, character building, monsters, spells, literally everything they've published free to everyone to play their game. The only pay wall you'll find with Paizo is their premade campaigns and even those can be found free online. Here's the link to Nethys:
They're just a solid company, many of them were part of the DnD team during DnD 3.5 edition (this is what 1e is based off of) and broke with DnD when they saw the company going in a different direction. They were the front runners fighting against Hasbro when they tried to copywrite everything and was the one that led the legal fight against Has to and the start of the new free license agreement that would be held by a neutral third party so no one could try that stunt again.
Long story short, please try pathfinder. I can guarantee you'll love it!