There are plenty of clones. MegaBlocks has been the most visible for a long time. I believe Lego owns the exact dimensions and ratios of their bricks. I recent

There are plenty of clones. MegaBlocks has been the most visible for a long time. I believe Lego owns the exact dimensions and ratios of their bricks. I recently got into NanoBlocks, which are about 1/4 the scale and different dimensions. Ease of storage and display due to tiny size is a big differentiator