Rank tracking tools love to notify you the instant a number changes. We deliberately don't — our drop alert only fires once an app falls 10 spots or more between two measurements. The tempting, wrong version A 1-spot threshold sounds like the more attentive product. In practice it turns every notification channel into noise: App Store search rank has real day-to-day jitter that has nothing to do with anything you did — a competitor's own rank shifting, a re-index, sampling timing. Alert on every 1-spot move and within a week the alert is something people mute, which defeats the entire point of having one. Why 10, specifically 10 spots is large enough to almost never be pure noise and small enough to still catch a real problem while it's still cheap to fix — a keyword field edit, a screenshot swap, a review-response push. Wait for a 30-spot collapse before alerting and you've waited past the point where the fix is simple. The threshold is symmetric: the same 10-spot rule fires on a jump upward, so a keyword field change you made on purpose gets confirmed by the same mechanism that would have warned you if it went the other way. The trade-off we're making explicit This means small real movements — 3 spots, 5 spots — genuinely don't page anyone. That's intentional, not a limitation we're hiding: an alert system tuned to catch everything catches nothing anyone still trusts by week three. A threshold set high enough that every alert is worth opening is worth more than a lower one that trains you to ignore your own notifications. If you're building anything similar — uptime, price, rank, any noisy time series — the question worth asking isn't "how sensitive can I make this," it's "what's the smallest move that's still cheaper to catch early than to catch late." That number is rarely 1. We build Storelift, where this threshold governs both the in-app alert and the rank-drop email.