Price drops, price history and a fair-price verdict on every listing

Facebook Marketplace and Kijiji show you a price. They don’t show you where it has been. Marketplace keeps one old price crossed out after a cut, Kijiji keeps none, and a seller who deletes a listing and posts it again wipes even that. Sift keeps the record for you.

Price drops on the photo

Sift remembers every price it sees as you scroll. When a listing comes back cheaper, a small badge lands in the corner of its photo: ↓ 25%. The drop is measured from the highest price Sift has seen for that listing, so a listing cut twice shows the whole fall, not just the last step.

The badges sit in the corner and stay out of your way. You can scan a page of forty listings and see at once which three have moved.

The full history, dated

Point at the drop badge, or tab to it with the keyboard, and the price history opens on the listing:

• the current price and the total drop;
• a small step-line chart of every price Sift has recorded;
• up to four changes, newest first, each with its date: “Sep 12 CA$600 → CA$450 −25%”;
• a footer such as “Tracked since Sep 3 · lowest CA$400”.

If Sift has only Facebook’s crossed-out price to go on, it says so (“Facebook shows it was CA$600”) rather than pretending it tracked it. That is the record you would keep in a spreadsheet, kept for every listing you scroll past, without the spreadsheet. Why it matters is in how to see price history on Facebook Marketplace.

Reposts can’t hide

Some sellers never lower a price. They delete the listing and post the same item again, so it climbs back to the top of “newest” and loses its history. Sift recognises the item when it comes back and marks it ↻ Reposted, with when it was first listed and at what price.

A repost isn’t a scam. It is a seller whose item hasn’t sold, which is exactly who you want to make an offer to. If you would rather not see reposts at all, Sift can hide them instead.

Fair price at a glance

Each listing gets a verdict badge: Below typical, Typical or Above typical. Sift works it out from the other listings on the same search page:

1. It collects the usable prices on the page, leaving out sponsored listings, free and placeholder prices (such as CA$1) and wanted posts.
2. It waits until there are at least eight, so a thin page gets no verdict rather than a misleading one.
3. It sets aside the extremes and finds the middle range of what the page is asking.
4. A price under that range is Below typical; one over it is Above typical; the rest are Typical.

The limits are the point of the design. The verdict compares asking prices on the page you are looking at, so it is only as good as your search: “dresser” across a whole city mixes kids’ furniture with antiques, while “IKEA Hemnes dresser 8 drawer” gives a sharp answer. It is a signal for which listings deserve a closer look, never an appraisal. Our guide on how to tell if a price is fair covers the full check.

A price under half of what the page usually asks also gets a “Check this” chip, because that is where the bait sits. More on that in the scam checker.

Check elsewhere in one click

The details card on every badge carries four plain links, never affiliate ones:

• eBay sold prices for the listing’s title, so you see what the thing actually sold for (ebay.ca for Canadian homes and Kijiji);
• Google Lens with the listing photo, to identify the exact model or find the photo somewhere it shouldn’t be;
• Google Shopping for the price new;
• the same search on the other site: Kijiji from Facebook Marketplace, Facebook Marketplace from Kijiji.

Everything in one place

Click any badge for the details card: price history, fair price with the page’s middle price and how many listings it is based on, any red flags or good signs, and the check-elsewhere links. Open a listing and a small Sift panel in the corner shows the same notes for that listing, along with when it was posted. Fold it to a pill when you don’t need it.

The Price drops page

Sift’s settings have a Price drops page that lists every listing you have scrolled past that got cheaper since, newest change first, with the drop, a small chart and a link back to the listing. It turns a week of casual browsing into a shortlist of sellers who are already moving.

Your history stays on your computer

Sift has no account and no server, and it doesn’t send your browsing anywhere. The price history lives in your browser’s storage on your computer: the listing’s id, title and link, and the prices seen with their dates. No photos, seller names or messages. It keeps up to 12,000 listings per site and prunes the oldest itself. Clear it any time from the Data page in Sift’s settings; removing the extension removes it all. The details are in our privacy policy.

What it doesn’t do

• No notification for one listing’s price. Sift marks drops when the listing turns up in your searches and lists them on the Price drops page. If you want a ping the minute one specific listing changes, a single-listing tracker does that job better; see our comparison of Marketplace extensions.
• No history from before you added it. Sift records what it sees from the day it starts.
• No phone. It runs in Chrome, Edge and Brave on a computer, not in the Facebook or Kijiji apps.

Sift is free and coming soon to the Chrome Web Store. Everything else it does is on the features page.