ChatGPT and Gemini give a number. Underpriced AI shows the sales behind it.
ChatGPT and Gemini identify almost anything from a photo and will name a price. Underpriced AI prices the item from recent eBay sold listings you can open, one by one, when there are any, then writes and publishes the eBay listing. Free first scan, no card.
ChatGPT & Gemini vs Underpriced AI
| Feature | ChatGPT & Gemini | Underpriced AI |
|---|---|---|
| Identify any item from a photo | ||
| Barcode scanning (books, CDs, vinyl) | ||
| Real sold comps with clickable links to verify | Not stated: neither plan page names a sold-listings source | |
| Sold data across eBay, Poshmark, Mercari | Not stated | |
| Live active listings | Not stated | |
| Market saturation + category sell-through | ||
| Platform fee / take-home calculator | ||
| Weekly portfolio email: value, what sold, what's trending | ||
| AI-generated listing title + description | Drafts text only | |
| Direct eBay publishing (10 markets) | ||
| Bonanza publishing | ||
| Cross-listing (one-click autofill) | eBay, Facebook, Poshmark, Mercari, Depop, Vinted, Whatnot, OfferUp, Etsy + | |
| One-tap reprice / refresh value | ||
| Inventory management (death pile, storage, tags) | ||
| Purchase price + profit/loss tracking | ||
| Analytics dashboard (ROI, aging, sourcing) | ||
| Estate & garage sale finder | ||
| Platforms | Web, iOS, Android | iOS, Android, Web, extension |
| AI model | GPT / | Claude Opus 5.5 |
| Free first scan, no card | Free tier | |
| Sold prices from more than one source, with automatic failover | Not stated | |
| Works inside ChatGPT, Claude and coding assistants (MCP) | It is the assistant, but has no sold-comp tools of its own | |
| Scan packs, no subscription required | Not stated | 5 scans for $3 |
| eBay Promoted Listings at your own ad rate | Not stated | |
| Pricing accuracy measured against real sales and published | ||
| Starting price | Free tiers; Gemini paid plans from $4.99/mo (Google AI Plus) | Free scan, then $5/mo or a $3 5-scan pack |
ChatGPT & Gemini facts checked 2026-10-10 against chatgpt.com/pricing and gemini.google/subscriptions. “Not stated” means their public material does not say; it is not a no. Their features and prices can change.
What the chatbots give you
A strong identification, a plausible description and a price. Both have free tiers with web search, and paid plans. Neither plan page names a source of completed sales, and neither publishes a listing, fills eBay item specifics or tracks your inventory.
What changes with sold data
Underpriced AI identifies the item the same way, then prices it from recent eBay sold listings, backed by an automatic backup source and our own archive of past sales, plus category sources where they fit, and, when there are recent sales, shows each one as a link. You get a range, three list prices with a two-week sell chance, the net after fees and a worth-it verdict, then a listing published to eBay in 10 markets or Bonanza. If you already work in a chatbot, the MCP connector puts those sold comps inside it.
How the numbers compare
We do not claim our price beats a free chat. We measure it instead: every week, our price and other AI models on the same photos, against what sellers reported the items sold for. See the weekly comparison on the accuracy page.
ChatGPT & Gemini may fit if you
- Only need to identify an item or draft a description
- Already pay for a chatbot and want no second tool
- Price rarely and do not need the sales behind the number
Choose Underpriced AI if you
- Want to open the sales behind a price before you buy
- Want the listing written and published, not only drafted
- Track inventory, fees and what you netted
- Want sold comps inside ChatGPT or Claude through MCP
Common questions
Can ChatGPT or Gemini tell me what my item is worth?
They will give a number, and both can search the web. Neither plan page names a source of completed sales. Underpriced AI prices from recent eBay sold listings and, when there are recent sales, shows each one as a link you can open.
Is Underpriced AI more accurate than ChatGPT or Gemini?
We do not claim that. Every week we compare our price with other AI models on the same photos against what sellers reported the items sold for, and publish the table at underpricedai.com/accuracy. What a chat does not give you is the sales behind the number and the listing afterwards.
Why pay for Underpriced AI when the chatbots have free tiers?
For the parts a chatbot does not do. That means the recent sold listings behind the price, each one clickable, three list prices with a two-week sell chance, and the net after fees. It also means a listing published to eBay in 10 markets or Bonanza, crosslisting with the desktop extension, and inventory that tracks what sold. If you only price now and then, a 5-scan pack is $3 with no subscription.
Does Underpriced AI use AI like ChatGPT and Gemini?
Yes. It runs on Claude Opus 5.5 to identify the item. The difference is the next step: it searches recent sold listings, prices from them and shows them to you.
Can I use Underpriced AI from inside ChatGPT or Claude?
Yes. An MCP connector lets ChatGPT, Claude and coding assistants price an item, pull the sold comps and get a worth-it verdict inside the chat. Set it up at underpricedai.com/mcp.
See what it really sold for
Your first scan is free. No card.
Try a free scanPrefer real sold-data pricing? Get more of our guides in Google Search.