How to set stock price alerts that you will actually act on

August 10, 2026·6 min read

A stock price alert is a rule you attach to a ticker: tell me when this crosses a line I care about. Setting one takes under a minute in any modern app. Setting one you will still trust in three months is the harder part, and it comes down to three decisions — the trigger type, the threshold, and how many alerts you run at once.

Price alerts vs percent-change alerts

Almost every app offers an absolute price trigger: notify me when NVDA reaches $180. Fewer offer a percent-change trigger: notify me when NVDA moves 5% in a day. They answer different questions, and using the wrong one is the most common reason alerts get ignored.

• Use an absolute price alert when you already know what you would do at that price. A buy level you have been waiting for, a level where you would trim, a stop you set deliberately. The price is meaningful because a decision is attached to it.
• Use a percent-change alert when you have no target but want to know that something happened. This covers most positions most of the time: you are not waiting for a number, you want to hear about it when the stock does something unusual.

A useful test: if you cannot finish the sentence “when this fires, I will …”, you want a percent-change alert, not a price alert. A price alert without a decision behind it is just a slow, arbitrary notification.

Picking a threshold that survives contact with the market

The single biggest mistake is setting the threshold inside the stock’s normal daily range. If a stock routinely swings 3% between open and close, a 2% alert fires most days, tells you nothing you did not already know, and — worse — teaches you that alerts from this app are noise. A few weeks later you are dismissing the one alert that mattered.

A practical starting point

• Look at the last few weeks of the chart and note roughly how far the stock moves on an ordinary day.
• Set the percent-change threshold meaningfully above that — for a stock that usually moves 1–2%, something like 5% is a real event; for a volatile one, it may need to be 8–10%.
• For price alerts, prefer round levels you actually reasoned about over precise-looking numbers you did not. $250 you chose beats $247.30 you did not.
• Revisit after a month. If an alert never fired, it is too far out; if it fired more than a handful of times, it is too close.

How many alerts is too many?

Alert fatigue is not a personality flaw, it is arithmetic. Every alert costs a few seconds of attention and a decision; past roughly five to ten live alerts, they arrive faster than you can evaluate them and the rational response is to stop reading them. At that point the alerts have negative value, because they also mask the ones that matter.

The fix is not fewer tickers, it is the right tool per ticker. Keep the wider set on a watchlist you glance at on your own schedule, and reserve alerts for the handful where a decision is genuinely waiting on a number.

Setting a stock price alert in StockPlus

The flow below takes under a minute and works the same on iOS and Android. Price and percent-change alerts are both included on the free tier; Pro raises the number of alerts you can keep live.

1. 1

   Open the ticker you want to watch

   Search for the company or tap it in your watchlist. The alert is attached to the ticker, so you do not need to own the stock or connect a brokerage account.

2. 2

   Tap Set Alert

   The alert sheet opens over the chart, so you can see the stock's recent range while you pick a threshold rather than guessing from memory.

3. 3

   Choose price or percent change

   A price alert fires when the stock crosses an absolute level you name. A percent-change alert fires when it moves by a given amount, in either direction, regardless of where the price is.

4. 4

   Enter a threshold outside the normal daily range

   Check what the stock typically moves in a day and set the trigger beyond it. A threshold inside the usual range fires constantly and trains you to swipe alerts away unread.

5. 5

   Save, then confirm notifications are allowed

   Alerts are evaluated server-side and delivered as a push notification, so they arrive whether or not the app is open — but only if notification permission is granted. If nothing arrives, that permission is the first thing to check.

Why some alerts never arrive

Three causes account for nearly all missing alerts, in this order:

• Notifications are off. The alert fired; the phone dropped it. Check the OS-level notification permission for the app first — it is the cause often enough to be worth checking before anything else.
• The alert is evaluated on-device. Apps that check thresholds locally can only do so while running in the background, and the OS suspends background work aggressively. A server-side check plus a push notification does not have this failure mode — why alerts fail when the app is closed covers how to test which kind yours is.
• The threshold was crossed outside market hours. Pre-market and after-hours prints may not count as a cross, depending on the app. If a gap open matters to you, confirm how the app treats extended-hours trading.

The short version

Price alerts for decisions you have already made. Percent-change alerts for everything else. Thresholds outside the normal daily range, revisited after a month. Fewer than ten live at once. That is most of what makes the difference between an alert system you act on and one you mute.