How to Read a Price History Chart (and Tell If This Sale Is the Bottom)

By Lowstamp Editor · 2026-06-20

A red -75% badge during a sale makes you want to click before it's gone. The badge alone can't tell you whether the game is at its lowest right now, or whether it'll be exactly this price again next month. The price chart can. It's just a line showing how the price rose and fell over time, and once you know what to look for, you can tell a real opportunity from noise in a few seconds.

What you're looking at

The chart plots one game's price over months or years. Time runs left to right, older on the left. Price runs bottom to top. A $59.99 game that dropped to $19.99 last summer and climbed back shows as a high line with one deep valley cut into it. The valleys are the sales.

It can look busy, but you only want two things from it. How low the line has ever gone, which is the tracked low, and how close today's price is to that bottom. Read those two and you've read the chart.

Find the bottom line first

The first thing to find is the deepest dip. Lowstamp draws that low as its own line, so you can see immediately whether today's dot is sitting on it or floating well above. Dot on the line, or below it: a genuinely good price. Dot far above: no matter how big the badge, the game has been cheaper.

Look at how close the dot is to the bottom line, not at the percentage. Even -90% may not be a good price if the dot sits well above the line.

The flat line: a permanent sale

The shape to be wary of is a long, flat line lying along the bottom. Plenty of games settle at a low price a year or so after release and never really move. A -75% badge on those is the everyday price, not a sale. There's no reason to hurry at 'on sale now', because next month will show the same thing.

Two examples. Game A sits high and plunges into a valley two or three times a year. Those valleys are the real chance. Game B dropped once and its line has stayed flat and low ever since. Buy it whenever; the price is the same. The same -75% means a real bottom for A and just another Tuesday for B.

Valleys in the same spot every summer and winter

Look at a chart over a long span and a rhythm shows up. Many games drop to the same price around summer and winter, climb back, and repeat. On the chart it's valleys of similar depth at regular intervals. Once you see that, you can guess where the next sale will land. If the last two summer and winter sales both bottomed at $19.99, today's $29.99 discount can wait.

Steam's big sales are summer and winter, with shorter ones in March and early October. The spacing of the valleys tells you whether a game follows that cycle, or only drops now and then with no pattern at all.

New releases have short charts

A brand-new game has only a few dots, so there's no low to compare against yet. New releases usually barely discount for the first few months and take their first real cut at a seasonal sale. Treat a short chart as 'not enough history to judge', and unless you're in a hurry, watch through at least the first sale.

Find the deepest dip on the chart. That's the tracked low.
Check whether today's dot is on that bottom line or well above it.
A long flat line at the bottom is a permanent sale. No need to rush.
Valleys repeating every summer and winter mean the next big sale is worth waiting for.
A chart with only a few dots isn't enough to judge. Watch the first sale.

On Lowstamp

Each game page shows list price, today's price and the tracked low on one line, with the chart underneath. The chart plots a dot only on days the price changed, so the shape is easy to read: deep valleys, a flat bottom, or a handful of dots. The stamp measures the gap between today's dot and the low for you, so on days you don't feel like reading the chart, the stamp is enough.

Lowstamp's records start in June 2026, so the chart's earliest dot is from then. A game may have gone cheaper before that. The longer the chart, the more it's worth.

Not the red percentage. How close today's dot is to the bottom line.

Four shapes are all you need. A dot touching a deep valley is a good chance. A long flat stretch is a permanent price. The same valley every summer and winter means wait for the next one. A few dots means hold off. Remember those and the badges stop steering you.