Anyone who turns on competitor price monitoring for the first time makes the same mistake: alert on everything. Within a week the alerts are arriving faster than you can read them, most of them are one-cent rounding moves, and you start deleting the whole folder unread. At that point the monitoring is running but it has stopped being useful.
A threshold is the size of price change worth telling you about. Getting it right is the difference between five alerts a week that each lead to a decision and eighty that lead to nothing.
Start from your margin, not from a round number
Most people set 5% because it sounds reasonable. The right starting point is the share of margin you are willing to give up to stay competitive. If a product carries a 30% gross margin, a competitor moving 3% is something you can answer without pain. If it carries 8%, a 3% move is most of your profit and you want to know immediately; a 1% threshold is correct there.
Rule of thumb: set the threshold at roughly one tenth of the product’s gross margin percentage, then round to something you can explain. Thin-margin electronics land at 1–2%. Home and hobby goods with healthy margins land at 5–8%.
Use absolute amounts on expensive products
Percentages behave badly at both ends of a catalog. On a $19 accessory, 5% is under a dollar — noise. On a $2,400 machine, 5% is $120, and you would want to hear about half of that. Where you can, set percentage thresholds on low-value products and a currency amount on high-value ones, or use whichever of the two is larger.
Three thresholds that cover most catalogs
- Bestsellers and price-shopped items: 1–2%, or any change at all if the product is one you are known for. These are the pages buyers compare side by side before ordering.
- Normal catalog: 5%. Enough to skip repricer noise and promotional rounding, tight enough to catch a real campaign.
- Long tail: 10%, or alerts only on going out of stock. You do not need to know that a product you sell twice a month moved by a few percent.
Alert on the things that are not price
Two events matter as much as a discount and are usually missed. First, a competitor going out of stock on a product you have: that is a window to hold or raise your price, not to match theirs. Second, a competitor raising a price: it often means a supplier increase is coming to you too, and it gives you room. A monitoring setup that only watches for discounts sees half the picture.
Review the thresholds once, after two weeks
Do not try to get this perfect on day one. Run for two weeks, then look at what arrived: if you acted on fewer than one alert in five, the threshold is too loose and should go up. If you found price changes in the history that never triggered an alert and you wish they had, it should come down. One review is usually enough for a year.
Prizeee lets you set the threshold per product rather than one setting for the whole account, keeps the full price history so you can check what you missed, and only emails when a change crosses the line you set — including for products a competitor adds later if you track their whole category page. The 7-day free trial is enough to tune your own thresholds on real data.
For the wider picture, start with how to monitor competitor prices automatically.