ReGO
A real result
49
parts short
¥39,200
you saved
A real result, after registering 31 sets.

Before you buy more LEGO.

Your collection can already build more than you think — try it now, no sign-in needed.

Sets you own
例:
Press Enter to add. The more sets, the sharper the result.
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12,000+ sets supported50,000+ parts coveredInstruction downloads included
Features

Register your sets —
and see all of this.

From part counts to buildable-set search, shopping and trading — it all happens inside Re:GO.

Automatic part counts

Register a set and every part inside is counted automatically — your whole brick inventory, finally visible.

Search buildable sets

We match your inventory against the full catalog and suggest sets you can build now — or almost.

Pinpoint missing parts

Missing parts listed down to color and shape — with how many, and roughly how much, to finish.

Shopping list & PDF

Turn shortages straight into a purchase list, with PDF export and printing.

Building instructions

Open instructions for supported sets right in the app — no paper manual needed.

Part trading matches

Swap your spare parts for missing ones with other users — sometimes you don't need to buy at all.

Share your collection

Publish your sets and parts on a public profile and show off your collection.

Real example

Just 13 parts away
from finishing this castle.

You're already 96% of the way to Lion Knights' Castle. Re:GO works out the missing parts and the estimated cost for you.

13
Missing parts
¥480
Est. cost
Build a shopping list

Turn the missing parts straight into a shopping list — sourcing them is effortless.

10305
Lion Knights' Castle
Castle · 4,514 pcs
96%
Completion
13
Missing parts
¥480
Est. cost
Inside Re:GO

Everything, clear at a glance.

Completion, missing parts, estimated cost, and a ready-to-go shopping list.

Recommended set
42143
Ferrari Daytona SP3
Technic · Car
91%
41 parts to finish
Missing parts
223
Parts missing
¥4,460
Est. cost
2×4 Brick / Red×8
1×2 Plate / Gray×5
1×1 Round / Yellow×12
Shopping list
2×4 Brick / Red×8
Technic Pin / Black×14
1×1 Round / Yellow×12
Export PDFPrint
How it works

Up and running in three steps.

From there, Re:GO does the math for you.

1
Enter a set number
Just type in the sets you own.
2
We crunch the parts
We match every part against the catalog.
3
See what you can build
Discover what you can build right now.
FAQ

Frequently asked questions

No. Re:GO is an unofficial service and is not affiliated with the LEGO Group. LEGO® is a trademark of the LEGO Group.

Sign up free —
turn your LEGO into an asset.

One minute to sign up, free to start.Your try-it results carry straight over.

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What you get when you sign up
All your sets and parts in one place
Unlimited buildable-set search from your inventory
Missing-part lists and shopping lists
Building instructions in the app
Part trading and collection sharing