Set completion checker
Track which parts you already own for any official LEGO set and see what is still missing.
How it works
- Search for a set by number or name — for example 10305 or "Lion Knights Castle".
- We load the full parts inventory from our catalog (excluding spare parts).
- Check off each part+color line you already have. Your progress is saved in your browser.
- Switch to the missing-parts view to see what you still need, sorted by quantity.
Tips
- → Use this when rebuilding an incomplete set from a bulk lot or when verifying a purchase.
- → Color matters — the same mold in different colors counts as separate inventory lines.
- → Pair with our scanner: identify loose parts first, then mark them off here.
- → Export missing parts as CSV when you are ready to buy replacements on BrickLink.