How to Use Keepa: Read Price and BSR Charts Like a Pro (2026)

By Gulfam Haidar, Founder, GrowEventure. Last updated September 2026.

How To Use Keepa: quick summary

In short, this guide covers how to use keepa in plain terms. Below you will find the key points on how to use keepa, a breakdown you can act on today, and clear answers to the most common questions about how to use keepa.

To use Keepa, open a product’s Keepa chart and read three things: the price history lines (Amazon, New, Buy Box), the green Sales Rank line, and any shaded out-of-stock gaps. Frequent drops in the Sales Rank line mean more sales. The free version shows price and rank history. Paid adds sales estimates, alerts, and the Product Finder.

The Keepa chart looks busy at first. Once you know what each colored line means, it becomes the fastest way to judge a product’s price trend, demand, and stock history. This guide decodes every line, then turns that reading into restock and buying decisions with worked examples.

What is Keepa and is it free?

Keepa is a price and sales rank tracker for Amazon. It records the price and Best Sellers Rank of products over time and plots them on one chart. You add it as a browser extension, and the chart then appears on Amazon product pages automatically.

The free version covers what most sellers need day to day: full price history and full BSR history for any product. That alone answers whether a price is normal or inflated and whether demand is steady or seasonal.

The paid subscription adds sales estimates, price-drop and availability alerts, the Product Finder for filtering the whole catalog, and data export with API access. For a single seller checking products by hand, the free extension is often enough.

One setup tip before you start. After you install the extension, refresh any Amazon product page you already had open, or the chart may not appear. The graph loads inside the page itself, below the listing details, so scroll down if you do not see it right away.

How to read a Keepa price chart

The price chart plots several lines. Each color means a specific seller type. Colors can vary slightly by settings, but the standard reading is this.

• Orange line: the Amazon price, when Amazon itself sells the item.
• Blue line: the New price from third-party sellers (the lowest new offer).
• Pink line: the Buy Box price, the price most buyers actually pay.
• Black or gray: the Used price.
• Shaded areas: periods when the item was out of stock or had no offer.

Read the Buy Box line first, because that is what real buyers pay. Compare it to the New and Amazon lines to see who usually holds the Buy Box.

Spotting price drops and typical vs inflated prices

To judge whether today’s price is good, zoom the chart to 12 months. Look at the range the Buy Box line usually sits in. That band is the typical price.

If the current price sits at the bottom of the band, it is a genuine drop. If it sits at the top, or above the usual band, the price is inflated, even if a coupon makes it look like a deal. A price that spikes right after a long out-of-stock gap is often a seller testing a higher price, not a real market rate.

The lesson: never judge a price by today alone. Judge it against its own history.

How to read the BSR (Sales Rank) chart

The green line is the Best Sellers Rank. This is the single most useful line for demand.

Lower is better. A BSR of 500 means the product sells more than a product ranked 5,000 in the same category. Rank is relative to the category, so always read it in context.

Here is the key insight. Each downward spike in the green line is roughly one sale. When a product sells, its rank improves (the number drops), which shows as a sudden dip. Then the rank slowly drifts back up until the next sale. So a green line full of frequent, sharp dips means frequent sales. A green line that is mostly flat means few sales.

Read the pattern, not a single point. Many dips close together is a fast seller. A flat line with rare dips is a slow one.

Estimating sales from BSR drops

You can estimate velocity without paying for Keepa’s sales estimate feature.

Count the downward spikes in the green line over a set period, say 30 days. Each spike is roughly one sale. Twenty clear drops in a month suggests roughly 20 sales that month from that reading. It is rough, but it gives you a floor.

Set your expectations. This method undercounts when many sales happen fast, because closely spaced sales blur into one move. It also depends on category. A rank of 2,000 in a huge category like Home means far more sales than a rank of 2,000 in a small category. Always compare rank to the category size.

For a more precise number, the paid Keepa sales estimate and tools like Helium 10 or Jungle Scout model this for you. Cross-check them against your own drop count so you are not trusting one source.

Here is the counting method in practice. Set the chart to 30 days. Count the clear downward steps in the green line. Say you count 18. That suggests at least 18 sales in the month from that product, and likely more, since fast back-to-back sales blend into one step. Now check the category. If this is a small category, 18 sales may still leave the product near the top of its rank. If it is a huge category, 18 sales barely register. The same rank number means very different volumes in different categories, which is why context is not optional. Read the green line and the category together, never one alone.

Using Keepa to time restocks and buying

Keepa turns history into decisions.

For restocks, read seasonality. If the green line shows deeper, more frequent dips every fourth quarter, demand climbs before the holidays. Order earlier so you do not run out during the peak. If you see a long shaded out-of-stock gap in your own product’s past, that is lost sales you can avoid next time.

For buying, arbitrage and wholesale sellers use Keepa to vet a purchase. Before buying stock to resell, they check that the Buy Box price is stable (so it will not crash after they buy) and that the green line shows steady sales (so the stock will actually move). A product with a falling price line and a flat rank line is a trap: it is getting cheaper and barely selling.

Watch out for out-of-stock gaps here too. A rank that looks great may be resting on a period when few sellers competed. Once stock returns and competition rises, both price and rank can change.

Seasonality deserves its own look before any restock decision. Set the Keepa chart to the longest range you can, one to two years, and study the shape of the green line across the calendar. Some products sell steadily all year. Others spike hard in one season and go quiet the rest of the time. A gift product may show a deep dip pattern every December and a flat line in summer. A garden product may reverse that. If you order the same quantity every month for a seasonal product, you will overstock in the slow months and run out in the peak. Reading a full year of the green line is how you match your purchase orders to the demand curve instead of guessing. This single habit prevents both the cash trap of dead stock and the lost sales of a stockout during peak.

Setting price-drop and availability alerts

The paid version lets you set alerts. Choose a product, set a target price, and Keepa emails you when the Buy Box drops to it or when a specific seller condition appears. You can also track a product’s price and rank over weeks without checking manually.

This helps two groups. Buyers wait for a genuine low before purchasing. Sellers watch a competitor’s price so they can react when it moves. If you track more than a handful of products, alerts save real time.

Keepa Product Finder and Data (paid)

The Product Finder is the paid feature that flips Keepa around. Instead of looking up one product, you filter the entire catalog by price, rank, drop patterns, category, and more. You can find, for example, every product in a category under a certain rank that dropped in price this month.

This suits sellers hunting for products to source or arbitrage deals to buy. The Data and API access let heavier users export history in bulk. A casual seller checking a few products by hand does not need this. A full-time sourcer often does.

Common mistakes reading Keepa

Avoid these.

• Misreading a spike. An upward spike in the green line is worse rank, not a sale. Sales are downward dips.
• Ignoring out-of-stock periods. A shaded gap distorts price and rank. Do not judge demand from a window when the item was unavailable.
• Trusting a single day. One data point tells you nothing. Read the 12-month trend.
• Forgetting category context. A rank number only means something next to the size of its category.
• Reading price without the Buy Box. The Buy Box line is what buyers pay. The lowest offer may not win the sale.

Keepa Free vs Paid (2026)

Feature	Free	Paid
Price history	Yes	Yes
BSR history	Yes	Yes
Sales estimates	No	Yes
Price-drop alerts	No	Yes
Product Finder	No	Yes
Data export	No	Yes
API access	No	Yes

Feature tiers can change. Confirm the current split on Keepa’s official site as of 2026.

(alt: “Anatomy of a Keepa chart”)

Frequently asked questions

Is Keepa free?

Yes, the browser extension is free and shows full price and BSR history. Paid adds sales estimates, alerts, the Product Finder, and data export.

How do you read a Keepa graph?

Read three things: the price lines (orange Amazon, blue New, pink Buy Box), the green Sales Rank line, and shaded out-of-stock gaps. Downward dips in the green line mean sales.

What does the green line on Keepa mean?

It is the Best Sellers Rank over time. Lower is better, and each downward dip is roughly one sale.

How accurate are Keepa sales estimates?

They are directional. The rank-drop method undercounts fast sales and depends on category size. Cross-check against a tool like Helium 10 or Jungle Scout.

What does BSR mean on Keepa?

BSR is Best Sellers Rank, Amazon’s measure of how well a product sells in its category relative to others. Lower means more sales.

How do I know if a price is good on Keepa?

Compare today’s Buy Box price to the 12-month band. Bottom of the band is a real drop. Top of the band or above is inflated.

Can Keepa estimate how many units sell?

The paid version gives a sales estimate. On the free version, count the downward rank drops over a period for a rough floor.

Is Keepa worth paying for?

For casual product checks, the free version is enough. If you source products, track many items, or want alerts and the Product Finder, the paid plan pays off.

Sources: Keepa official documentation (chart definitions and feature tiers); Amazon Best Sellers Rank help pages (what BSR measures); Helium 10 and Jungle Scout methodology notes on BSR-to-sales estimation.

Related reading: best amazon seller tools, amazon product research, amazon SEO tools, Helium 10 review, and our Amazon account management service.