BrickMissing is described as 'Free LEGO parts checker: see the full part inventory of 17,000+ official sets, find out which pieces you're missing and which sets you can build with the bricks you already own' and is an website. There are five alternatives to BrickMissing, not only websites but also apps for Android and Windows. The best BrickMissing alternative is Brickzip, which is free. Other great sites and apps similar to BrickMissing are Rebrickable, Brickset, Basebrick and brickDB.io.
Brickzip is a meeting point for LEGO fans from all over the world, where you can find out about the latest news, events, talk, share and meet people with similar interests within LEGO.
Rebrickable will show you which LEGO sets you can build from the sets and parts you already own. You can choose from official LEGO sets or thousands of MOCs (My Own Creations) submitted by hundreds of designers. All MOCs include building instructions and full parts lists.
Brickset.com was launched in 1997 to keep track of the many promotional sets that were appearing at that time. Since then it has expanded considerably and is now the primary reference on LEGO sets on the internet.
BrickDB.io is a comprehensive LEGO® database offering detailed information on sets, parts, and minifigures for enthusiasts and builders.
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