
SellDeck
Locks eBay and Depop listings during Whatnot shows and tracks show profit
Mascot (from $4/mo): Card inventory and crosslisting with a Whatnot channel and auto-delist on sale. The 12 closest tools are listed in the same category (Inventory & Cross-listing). 2 have a free plan or are free.
| App | Pricing | Platforms | Official Whatnot API | Compare |
|---|---|---|---|---|
| SellDeck | Free plan · from $8.99/mo | Web, Chrome extension | Not listed | vs Mascot |
| Crosslist | From $29.99/mo | Web | Not listed | vs Mascot |
| Vendoo | From $14.99/mo | Web, iOS, Android | Not listed | vs Mascot |
| Whatnot Connector for Odoo (Commercium) | From $239.76/mo | Web | Not listed | vs Mascot |
| TCG Automate | From $15/mo | Web | Not listed | vs Mascot |
| Shopify to Whatnot | Paid | Chrome extension | Not listed | vs Mascot |
| Card Pilot | From $9/mo | Web | Not listed | vs Mascot |
| ExportYourStore | From $29/mo | Not listed | Not listed | vs Mascot |
| Nifty | From $25/mo | Web | Not listed | vs Mascot |
| List Perfectly | From $29/mo | Web | Not listed | vs Mascot |
| Underpriced AI | Free plan · from $5/mo | Web, Chrome extension, iOS, Android | Not listed | vs Mascot |
| Sidekick Tools (formerly Posh Sidekick) | From $9.99/mo | iOS, Android, Web | Not listed | vs Mascot |
Prices checked by hand and may change; confirm on each maker's site.

Locks eBay and Depop listings during Whatnot shows and tracks show profit

Universal listing form that publishes to many marketplaces

One inventory list that crossposts and syncs sales, including Whatnot (beta)

Odoo app that syncs Whatnot listings, live stock and orders

Exports card listings to a Whatnot-ready CSV, auction or Buy It Now

Inventory, labels and multi-channel listing for card sellers, incl. Whatnot

Two-way Whatnot cross-listing and inventory sync with your other stores

Cloud crosslisting and automation, with Whatnot on Crosslisting and Bundle plans

One catalog to crosslist and track inventory across many marketplaces

Photo-to-listing pricing tool with a free extension for Whatnot forms

Automation bots and crosslisting for Poshmark, Mercari and Whatnot
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