Independent LEGO parts checker
About BrickMissing
BrickMissing is a free LEGO parts checker. Add the sets you own and it shows which other official sets you can build from those parts, and exactly which pieces you are missing.
BrickMissing is an independent project. It is not affiliated with, endorsed by or sponsored by the LEGO Group.
Where the data comes from
- Part inventories come from the Rebrickable catalog, which is based on official LEGO inventories, plus our own curation.
- Set descriptions summarise the official LEGO product copy. We write them with the help of an AI model, from that source text only. Where no source text exists, we show catalog facts instead.
- Part prices come from LEGO Pick a Brick. The catalog is updated daily.
- An inventory can differ from the piece count on the box, for example because of spare parts or missing records. Found an error? Let us know.
Our research
We also publish our own analyses of the catalog. The underlying dataset is freely available on Zenodo under a CC BY 4.0 licence.
How BrickMissing is funded
BrickMissing is free to use. Some links to LEGO.com are affiliate links: if you buy something after clicking one, we may earn a commission at no extra cost to you. Affiliate links do not affect which sets, parts or numbers we show.
Contact
Questions, a correction or a missing set? Email us at [email protected].