Short answer: daily at minimum for any category where price actually influences the sale, and several times a day during active sale periods. The right cadence depends on how fast your specific category moves — not a single universal number.
A category with frequent promotions, several close competitors, and price-sensitive shoppers needs near-real-time visibility — a same-day price drop you miss is a same-day sale you lose. A category with fewer direct competitors or less price sensitivity can get away with checking less often without much real cost.
Whatever cadence works the rest of the year, tighten it during Black Friday/Cyber Monday, back-to-school, and other high-competition windows. This is exactly when competitors change prices fastest and most often — a weekly check that was "good enough" in July can leave you blind for most of a Black Friday weekend.
It's not that you never notice a competitor's price change — it's that you notice it late, after a customer already compared prices and bought elsewhere. The value of frequent checking isn't the checking itself, it's shortening the gap between a competitor's move and yours.
At minimum, daily for any category where price is a real factor in the buying decision. During sale periods (Black Friday, holiday promotions, back-to-school) check several times a day — competitors change prices fastest exactly when it matters most.
For slow-moving, low-competition categories, weekly manual checks can be enough. For anything with active price competition or frequent promotions, weekly checking means you regularly find out about a price change days after it happened — often after losing a sale to it.
A once-daily check still means you can be up to 24 hours behind a change. Checking every few hours (Your Apparel Rivals checks every 4 hours) narrows that window without needing someone to actively watch a dashboard all day.
Your Apparel Rivals checks your tracked competitors automatically every 4 hours, so you don't have to decide when to look — see how to track competitor prices on Shopify for the full picture.