A few years ago, I used Brickr during research for a large-scale Lego mural that I built. It was pretty useful for getting a high-level estimate for the quantity of bricks I needed. I ended up doing my actual mural management on a spreadsheet, overlaid over an image of the mural mockup.
Here's the end result for the curious: https://i.redd.it/727aok97un961.jpg