HumCity
Sign inStart Listing Faster
lego selling software

LEGO selling software that recognizes every set

Snap a box photo. HumCity identifies the set number, year, and theme — and lists it.

Start free — 50 listings/mo View demo
The problem

LEGO resellers spend more time cataloging sets than buying them.

LEGO resale runs on volume — sourcing from clearance racks, Target end-caps, garage sales, and estate purchases — and the listing work piles up fast. Every set on eBay needs the set number, theme, year, piece count, age range, minifig count, and a clear condition statement (sealed, opened-complete, used). The same data is printed on every box, but typing it into eBay's form is a 5-minute job per listing.

The bigger problem is identifying retired or partial sets. A box that says "City" with a worn corner doesn't tell you whether it's a $30 modern City fire station or a $400 retired collector set without cross-referencing BrickLink. Doing that lookup manually for an estate buy is a weekend project.

HumCity recognizes LEGO sets by box photo. The set number is read from the side panel, the theme and year are pulled from a continuously updated set database, BrickLink-style comps are surfaced for pricing, and the listing ships to eBay with the right category and item specifics.

What you get

Capabilities built for this exact workflow.

  • Set identification from box-front and side-panel photos

    Drop a photo of the box front and HumCity matches it against the LEGO set catalog from 1980 to present. The set number is read directly from the side panel when visible. Theme (City, Star Wars, Marvel, Friends, Technic, Creator Expert, Ideas, etc.), year, piece count, age range, and minifig count are pulled from the catalog automatically.

  • Condition assessment (sealed, opened-complete, used)

    The AI distinguishes between sealed boxes, opened-but-complete sets (box damage, factory seal broken), and used sets (built or partial). The condition feeds into the eBay listing accurately, which is critical for LEGO buyers who pay significant premiums for true sealed product and substantial discounts for incomplete sets.

  • Comp pricing from BrickLink and eBay sold listings

    LEGO pricing has two reference points: BrickLink (the canonical secondary market for LEGO) and eBay sold listings. HumCity pulls both — BrickLink median for the set in matching condition, plus the last 90 days of eBay sold comps — and surfaces a suggested range with the median highlighted.

  • Minifigure identification and pricing

    Rare minifigs (Star Wars, Marvel, Collectible Series, Disney) often outvalue the set they came in. HumCity recognizes major minifig releases and supports listing them individually with the correct minifig category and BrickLink-style comps. Sealed CMF packs are recognized as multi-quantity inventory.

  • Bulk upload for liquidations and estate buys

    When you buy a 50-set liquidation lot or a basement of estate LEGO, Pile Mode lets you ingest everything at once. The AI identifies each set, pulls catalog data, and produces a complete inventory ready for review. You can decide which to list sealed, which to part out, and which to hold for retirement appreciation.

  • Auto-fills LEGO category specifics on eBay

    The eBay LEGO Building Toys category has its own required item specifics — Brand (LEGO), LEGO Theme, LEGO Set Number, LEGO Set Name, Year, Piece Count, Recommended Age, Number of Minifigures. HumCity prefills all of these from the catalog data, so listings ship complete on the first try.

Use cases

Built for the way real resellers work.

Retail-arbitrage LEGO flippers

Buying clearance LEGO and flipping to eBay or Amazon is a high-volume business. HumCity ingests entire shopping carts of sealed sets in one upload, identifies each, and ships listings the same day. Sealed-condition validation and condition-accurate listings reduce returns from disappointed buyers.

Retired set specialists

Retired sets (Modular Buildings, UCS Star Wars, Ideas, Architecture) appreciate predictably. HumCity recognizes the retired set lineup and prices against the post-retirement comp set, which is often dramatically different from the original MSRP. This is the workflow for sellers buying-to-hold or running secondary-market arbitrage.

Estate and basement-cleanout buyers

Estate LEGO often arrives as mixed bulk — built sets, loose parts, partial sets, sealed sets, minifigs all in one box. HumCity ingests it set-by-set in Pile Mode, identifies the recoverable sets, surfaces the minifig value, and helps you decide what to part out vs. list whole. The catalog data shortens a multi-day cataloging job to an afternoon.

CMF (Collectible Minifigures) sellers

Collectible Minifigure series have a specific resale workflow — sealed packs sell as multi-quantity, opened minifigs sell as singles with specific identification. HumCity recognizes CMF series releases and supports both workflows. Pricing comps come from the active CMF secondary market on both BrickLink and eBay.

How it works

From inventory to live listings in three steps.

01

Photograph the set

Box front works best. Side panel helps the set-number read. Loose builds and minifigs supported too.

02

AI identifies it

Set number, year, theme, piece count, minifigs, and condition pulled automatically.

03

List and ship

Listings posted to eBay with optimized title, category, item specifics, and pricing.

FAQ

Common questions

Can it identify retired LEGO sets?
Yes — HumCity recognizes sets from 1980 onward by box art and set number. Retired sets are explicitly flagged as retired in the catalog data, and pricing comps reflect the post-retirement market.
Does it handle minifigures?
Yes. We identify rare minifigs (Star Wars, Marvel, Disney, Collectible Series) and suggest pricing. Sealed CMF packs are supported as multi-quantity listings. Loose minifigs ship to the eBay LEGO Minifigures category with the right item specifics.
What about loose or used sets?
Photograph the build or a representative pile and HumCity infers the set and condition. Used and partial sets are flagged honestly so the listing doesn't oversell. For incomplete sets, you can add notes about what's missing in the bulk-edit interface before publish.
Does HumCity handle MOCs and custom builds?
Custom builds (MOCs) aren't in the official LEGO catalog so the AI can't identify them — but you can list MOCs with a manual workflow and HumCity will help generate the description and pricing suggestion based on similar listings.
Can I list sealed CMFs as a sealed box?
Yes. Sealed boxes of CMFs ship as multi-quantity inventory items with the correct eBay category. The individual minifigs from the series are identified separately if you choose to part the box.
How accurate is the set identification on damaged boxes?
Very accurate when the set number is readable on the side panel — the side panel is the strongest signal. For badly damaged boxes where the side number isn't visible, the AI falls back to box-art matching and may flag the identification for your review if confidence is low.
Does it work for LEGO Technic and large UCS sets?
Yes. Technic, Creator Expert (Modular Buildings), UCS Star Wars, and Ideas sets are all in the catalog with the correct theme designation and piece count. Large-box sets are particularly easy to identify because the side panels are large and clear.
Can I list LEGO accessories and minifig accessories separately?
Yes. Loose accessories (weapons, helmets, tools) can be listed individually in the appropriate LEGO Parts category. The workflow is the same — drop a photo, AI identifies and suggests pricing.
Is there a free tier?
Yes. Every account gets 50 free listings or revisions per month with no credit card required. Most resellers can fully evaluate the AI workflow, image recognition, and bulk upload before deciding to upgrade. Paid plans start at $10/month for 500 listings and scale with volume.
Does HumCity use the official eBay API?
Yes. HumCity is an authorized eBay API partner and uses the official Trading and Inventory APIs. Every listing published from HumCity appears in eBay Seller Hub normally, counts toward your eBay reputation, and respects your existing business policies for shipping, returns, and payments.
Related

Keep exploring HumCity

AI eBay listing generatorBulk listing tool for eBayeBay listing softwareInventory to eBay listings

Start with 50 free listings

No card required. Connect your store and drop your first photos in under 60 seconds.

Get started See pricing