Scatterplot for eBay by Davis

Add a price chart to eBay search pages - plot sold listings by sale date and active listings by price to spot trends and deals.

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About this extension

Scatterplot for eBay adds a price-history panel directly to eBay search pages, so you can see at a glance what items are actually worth before you buy or sell.

Pick the listings you care about and plot their prices on an interactive chart:

Sold listings are charted by sale date, revealing real price history over time.
Active listings appear in a separate price-distribution view, sorted by price so clusters and outliers stand out.

Because your selections are saved, you can page through the results and keep adding listings. The chart accumulates points from every page you visit.

Features

Interactive price chart docked to any edge of the screen (top, right, bottom, or left)
Per-listing checkboxes to choose exactly which items to include
"Plot all" to add or remove every listing on the page at once
Currency conversion: choose a display currency and all prices are converted from their original listing currencies using live exchange rates
Drag to redock: move the panel to any edge by dragging its header or tab
Resizable: drag the panel's edge to expand or contract it
Dark and light themes
Adjustable text size
Remembers everything between visits: selections, dock position, theme, font size, and open/closed state are all saved

Supported eBay sites: ebay.com, ebay.co.uk, ebay.de, ebay.ca, ebay.com.au, ebay.fr, ebay.it, ebay.es, and mx.ebay.com.

How to use it

Go to any eBay search page, and a small 📈 tab appears on the edge of the screen.
Click the tab to open the panel, or just check a listing to open it automatically.
Tick the "Plot" box on any listing to add it to the chart, or use "Plot all."
Hover over a point to see the item's title and price.

Your data stays in your browser. The extension saves your selections and preferences locally and collects nothing.

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Permissions and data

Required permissions:

Access your data for sites in the ebay.com domain
Access your data for sites in the ebay.co.uk domain
Access your data for sites in the ebay.de domain
Access your data for sites in the ebay.ca domain
Access your data for sites in the ebay.com.au domain
Access your data for sites in the ebay.fr domain
Access your data for sites in the ebay.it domain
Access your data for sites in the ebay.es domain

Optional permissions:

Access your data for api.exchangerate-api.com

Data collection:

The developer says this extension doesn't require data collection.