Halloween Costume Swap Planner — Wear It Twice, Pay Once

List the costumes your kids have outgrown and the ones you actually want. This planner highlights size-matched swaps, gives you 8 tips for hosting a swap party, and exports a clean txt list for your group chat.

Free Runs in your browser

Inventory & wish list Add owned costumes on the left, wishes on the right. Matching sizes get highlighted.

Costume you own

Costume you want

Match suggestions

Add costumes to see which equal-size swaps are easiest to arrange.

8 tips for running a swap

Host it 1–2 weeks before Halloween, not the night before — people need time to adjust.
Set one rule: only clean, undamaged costumes accepted, no missing parts.
Sort by size on racks or tables: toddler, kid, teen, adult.
Make it free. A swap stops being fun the second money enters it.
Let kids try things on in a corner — sizing is the #1 swap regret.
Anything left over goes to a local Buy Nothing group or thrift store.
Pair it with cider and a pumpkin-carving table so non-shoppers still stay.
Photograph the racks afterward for next year's event sign-ups.

How it works

From closet clutter to someone else's costume

Inventory your pile

Type the costume name and size for everything you own that still has life in it. It saves in your browser.

List what you want

Add the costumes you wish you had. The tool flags wish-list items whose size matches something you already own.

Export & swap

Download a plain-text list, drop it in your neighborhood group chat, and host the swap party with the 8 tips included.

Why a swap planner?

"$40 per kid, worn once, tossed by November" — your closet deserves better

On Facebook Marketplace, Buy Nothing groups and Nextdoor, parents are constantly giving away costumes their kids outgrew. The same threads complain that swaps fizzle because nobody knows who has what, in which size, and who wants what. This planner turns that chaos into two short lists and a size match — so next year's costume costs gas money, not another $40.

Track what you save More eco Halloween tips

Who is this for?

Parents whose kids outgrow costumes, neighbors running a Buy Nothing style swap, and anyone tired of buying a $40 costume worn once.

How does the size match work?

It highlights wish-list items whose size matches something in your own pile — the easiest fair swaps happen between equal sizes.

Where is my list saved?

In your browser via localStorage. Export the txt and share it in your group chat when you host the swap.