HobbyGM vs SellerAider

SellerAider is a Chrome-extension crosslister for 15+ marketplaces, with separate "Grow" plans that automate offers, relisting and messages. It suits resellers who work from a desktop browser across several marketplaces.

HobbyGM is a web app for eBay card stores. It connects to your store through eBay's official API, checks every listing each night, fixes titles and item specifics in bulk, and sends offers to watchers.

Side by side

“Not listed” means we didn't find the feature on the product's own site when we checked on October 14, 2026. If that's changed, tell us and we'll fix the page.

Where SellerAider is better

• Crosslisting to 15+ marketplaces.
• Sending offers, relisting and refreshing listings across its supported marketplaces, on Grow Pro.

Where HobbyGM is better

• Understanding cards: it reads year, set, number, parallel and grade from the title and fills eBay's card item specifics.
• Flagging titles that contradict their item specifics, and prices out of line with other sellers' listings of the same card.
• Offers to watchers with a floor at your break-even after eBay fees and shipping. On SellerAider, sending offers takes a Grow plan, from $18 a month.

SellerAider pricing

• Crosslister Standard: $12.99/month or $140/year, 15+ marketplaces, AI listing, inventory
• Crosslister Pro: $29.99/month or $299/year, adds Grow Pro, photo editing, auto-delist
• Grow Standard: $18/month or $130/year, one marketplace: send offers, relist, bulk edits
• Grow Pro: $25/month or $249.99/year, all supported marketplaces

14-day free trial.

From SellerAider: pricing, checked October 14, 2026. Prices change; check before you subscribe.

HobbyGM pricing

Connecting your eBay store to HobbyGM is free, and the public tools are free without an account. HobbyGM hasn't published paid plans.

What SellerAider does

• Crosslists to 15+ marketplaces from a Chrome extension, with AI listing generation and inventory. (source)
• Grow plans send offers, relist, refresh and bulk edit listings. (source)

What HobbyGM does

• Checks every listing in your store each night: titles, item specifics, and cards with no watchers three weeks after listing. (how the checks work)
• Fills missing item specifics from the title and adds missing search terms (parallel, print run, grade, team) to titles, in bulk, with review before anything is pushed to eBay.
• Flags listings whose title and item specifics disagree: card number, season, print run, autograph, rookie, grade.
• Compares each card's price with other sellers' current listings of the same card, matched on number, parallel, grade and print run.
• Sends offers to watchers in bulk, or automatically each night by your rules, never below break-even.
• Shows each listing's net margin after eBay fees, shipping and supplies, and flags cards that lose money or would ship cheaper by Standard Envelope. (fee calculator)
• Reads per-listing traffic from eBay, so you can see which cards get seen and not clicked.
• Covers sports cards, Pokémon, Magic, Yu-Gi-Oh!, One Piece, Lorcana and non-sport cards.

HobbyGM doesn't scan or identify cards, create new listings, list on other marketplaces, or look up sold prices for your cards. It works on the eBay listings you already have, however you made them.

Sources

• SellerAider: pricing