I had a need for this kind of tool a while ago, and this was the ONLY decent option I found

This is pretty neat https://home.by.me/en/

I like magicplan[0]. It's not perfect, but I like that I can just point my phone around the room and tap on points to create a rough layout. You can add in precise measurements later if you choose to. [0] https://www.magicplan.app/

I think "floor plan app" is the keyword you want to use, there are a bunch of these. You draw a floor plan and then most of them can give you a 3d render based on that. I used floorplanner.com, but there are several options.

When I was a kid around 1995, my dad brought home a demo of Chief Architect 4.0 on a floppy disk. It was basically full-featured except you couldn't save any plans. I had fun drawing 2D house plans. Eventually I discovered through randomly clicking around that there was a button where you could place a camera anywhere and VIEW YOUR HOUSE IN 3D. Incredible. I didn't even own a 3D videogame at that point. The house and all its furniture were untextured but you could select the paint colour. Look like they still exist[1] and have a consumer-targeted version now as well, called Home Designer.[2] I have no idea whether it's any good. [1] https://www.chiefarchitect.com/ [2] https://www.homedesignersoftware.com/

I figured there must be some professional software for this, but if so, I don't know what it is. There's a whole category of such software, it's called CAD. The professional products are notoriously expensive.

Floorplanner is pretty good imo but it’s an alternative with roughly the same features and functionality

> I figured there must be some professional software for this, but if so, I don't know what it is. As an architect I can confirm that there's indeed a lot of professional software for this. The ones I usually work in are Revit and ArchiCAD, which are tailored for architects. Our interior architects also use Sketchup a lot. There's also more general-purpose CAD software like AutoCAD and Vectorworks available.

I‘ve been working with sweet home 3d a bit but then gave up on it after running into rendering issues. Found https://pcon-planner.com/en/?privat=530&page=126 instead which is windows only and bon-open source but effectively free. Pretty impressive stuff. Been very happy so far.