Browser assistants that keep your reselling business moving
A family of assistants for online resellers: AI listing help for Mercari, eBay tools built on eBay's official API, pricing guidance, show planning for Whatnot sellers, and cross-list prefill — every assistant prepares, and you confirm each action yourself.
Mercari Seller Pro
Coming soonAI listing help and stale-listing alerts for Mercari — you review and click every post.
eBay Seller Pro
Coming soonOffers, markdowns, and listing fixes for eBay through eBay's official API — you review and confirm each one.
Comps Pro
Coming soonPricing guidance on the listing pages you're viewing.
Free tier available
Learn moreWhatnot Show Companion
Coming soonPlan your shows, then recap them from the sales reports you export from Whatnot.
CrossList Bridge
Coming soonCopy a listing from one marketplace, prefill another — you review and post it yourself.
How it works
Install the assistant
Add the extension for the marketplace you sell on from the Chrome Web Store. It sits quietly in your toolbar.
Start your 7-day trial
Pick a plan, start your trial, and paste your license key into the popup. No credentials, just the key.
Review, then confirm
Keep browsing and selling the way you already do. The assistant prepares drafts and suggestions on the page you're on — you review and click to confirm every action yourself.
Built to keep your account safe
Reselling accounts are hard to build and easy to lose. Safety and compliance come first in everything we ship.
Runs only in your own browser
Every ResellSmith assistant is a Chrome extension that works on pages you already have open in your own logged-in tabs. Nothing runs on a remote server, and there's no background activity while you're not there.
You confirm every action
The extension prepares drafts, prices, and suggestions. Nothing posts, edits, relists, or sends until you click that specific action yourself on the marketplace's own page.
No credentials stored, ever
We never ask for your marketplace username or password. You log in normally in your own browser; the assistant simply helps with what you're already doing.
You're responsible for the marketplace's rules
The extension is a set of tools that assists actions you choose to take. You stay responsible for following each marketplace's own terms, seller policies, and community guidelines.
Frequently asked questions
Is this safe to use on my reselling accounts?
No ResellSmith assistant stores your marketplace password. The browser assistants work inside your own logged-in tab, and eBay Seller Pro connects through eBay's official API with your permission, which you can revoke anytime from your eBay account. Nothing is posted, relisted, edited, or sent without you confirming that specific action yourself. You're still responsible for following each marketplace's rules.
Do I need one subscription per marketplace?
You can buy each assistant separately, or get the All Access bundle to cover every marketplace under one subscription and one license key.
Is there a free trial?
Every paid plan starts with a 7-day trial (a card is required to start it, and you can cancel anytime before it ends). Comps Pro also has a permanent free tier with no license required.
What happens if a marketplace changes its website?
Our selector registry tries multiple fallbacks per element, and any total miss triggers an alert so we can ship a fix — usually before it affects your workflow.