How Stock Alerts Work, and What Each Kind Misses
A stock alert is a message that fires when a rule set in advance comes true. Price alerts, news alerts, market updates and trade alerts all work this way, but they check different things, at different speeds, and they miss different things.
Last updated: 1 October 2026 · Educational, not financial advice.
Every alert has three parts
Take any stock alert apart and you find the same three parts.
- The trigger. What has to happen: a price, a percent move, a headline, or a set of rules all passing at once.
- The check. How often something looks at the market to test the trigger. It can be every trade, every few seconds, every few minutes, or once a day after the close.
- The delivery. How the message reaches you: a push notification, an email, a text message, or a chat app such as Telegram or Discord.
Most confusion about alerts comes from mixing these up. An app can show live prices and still test your trigger only every few minutes. A service can check the whole market all day and still reach you by an email that sits in a queue. So when a product calls itself real time, ask which of the three parts that describes.
One more thing holds for every kind. An alert reports that its trigger fired. It says nothing about what the price does next, and it knows nothing about your account or how much you can afford to lose.
Price alerts: the free kind you already have
A price alert fires when a stock trades above or below a level you pick, or moves a set percent in a day. It is the simplest alert there is, and it is free almost everywhere.
- Your broker's app. Fidelity, Schwab, Robinhood, Webull and Interactive Brokers all offer price alerts, and most offer percent move alerts too. It is the alert closest to where you would place an order.
- Yahoo Finance and Investing.com. Price alerts on a watchlist with only a free account. Both can alert your phone, and Investing.com can send email too.
- TradingView. Alerts on a chart event rather than a fixed number, such as the price crossing its own moving average. The free plan limits how many alerts can be active at once.
- Finviz. The free screener filters stocks but sends no alerts. You have to go and look.
Setting one up takes about a minute. Open the stock in the app, tap the bell or the item called Alerts, choose a trigger, choose how you want to hear, and set an expiry date if the app offers one. A percent move is usually more useful than a fixed price, because it does not go stale when the stock drifts away from a number you picked weeks ago. The expiry matters too: an old alert that fires months later trains you to ignore your own phone.
What free price alerts miss. They test one thing at a time. They know the price passed a line, not why it got there, whether real volume is behind the move, or whether this stock tends to give such moves back. And they only watch stocks you already know. None of them answers the harder question, which is which stocks are worth watching at all.
News alerts: fast headlines, little filtering
A news alert fires when something is published about a stock: a press release, an earnings report, a filing with the SEC, a change in an analyst's rating, a trading halt. Trading apps and free stock websites send these for stocks you follow. Paid news services send them faster and for the whole market.
Two problems come with every news alert.
- Speed. Professional traders pay for feeds that arrive in a fraction of a second, and computers trade on them before anyone reads the headline. A free push that lands a minute later usually arrives after the first move. Buying then often means buying from someone who bought before the news.
- No filter. A headline alert says a press release exists. It does not say whether the release contains any numbers, whether the stock trades enough shares to move on it, or whether the same company put out ten releases this year that went nowhere.
Alerts built on social media mentions have a timing problem of their own. People tend to post about a move they have just watched, so a jump in mentions often follows the price instead of leading it.
For the smallest stocks there is a further problem: often there is no news to send. A count published on this site found 76 news items across 2,730 stock days on 78 low float stocks, and 45 of the 78 had none at all in the 35 days before they were alerted here. When a headline does arrive, the filing behind it is free on the SEC's EDGAR site and is usually plainer than the press release. The guide to reading small cap stocks today covers what to look for in it.
Market update alerts: summaries, not signals
A market update alert sums up the market rather than watching one stock. Morning briefings, closing recaps, lists of the day's biggest movers, index moves and reminders about economic reports all belong here. Trading apps, market websites and newsletters send them on a schedule, by push or email.
They do one job well: telling you what happened. They are poor at a second job, telling you what to do about it, and they were not built for it. A movers list shows stocks that have already moved. By the time a stock tops the list of the day's gainers, the move it is listed for is over, and in small stocks a name near the top can give the whole move back within an hour.
The real choice in this group is timing. Intraday updates arrive while the market is open and invite you to act within minutes, often from a desk at work. End of day updates arrive after the close and give you the evening to think, at a cost: the next morning's opening price can be far from the price in the update. Pick the rhythm you can keep. An update you cannot act on is only noise.
Trade alerts and alert apps: an entry, a stop and an exit
A trade alert goes a step further. Instead of saying that something happened, it names a stock, a price and what comes next. This is what most people mean by a stock alert app or an alert service, and it comes in two kinds.
- Rules based. Software tests every stock against a fixed list of conditions and sends an alert only when all of them pass. The same setup produces the same alert every time, so the results can be counted and checked.
- Discretionary. A person reads charts and news and sends a call when something looks right. That can work, but it rests on one person's skill, mood and honesty, and the method can change without anyone saying so.
Either way, a useful trade alert arrives with its whole plan: the price, the stop, and the exit, whether that is a target, a time limit or both. An alert that sends only the buy leaves the hardest decision, when to sell, to you at the worst moment. Ask too whether the published results assume every alert was taken at the alert price. If you skip some, or get filled later at a worse price, your results will differ from the record.
Alerts on small and low float stocks need extra care. Spreads are wide, a few thousand shares can move the price, and halts and gaps are common. Penny stock alerts carry all of these risks at once.
How fast an alert really reaches you
Delivery is where most of the delay hides.
- Push alerts on your phone are usually fastest, but a phone in do not disturb or battery saver mode can silence or delay them, and the app has to stay installed and allowed to notify.
- Email can wait in a queue at either end, and a busy inbox buries it.
- Text messages are dependable but can cost extra on some phone plans.
- Chat apps such as Telegram arrive like any other phone alert and depend on the same phone settings.
Before any of that, check the prices themselves. Some free sites still show quotes that are 15 minutes old, which on a fast stock is history, not news.
Then there is the delay nobody counts: you. Seeing the message, opening the app, reading, deciding and placing the order often takes longer than every other delay put together. So for anyone with a job, the most useful alert is rarely the fastest one. It is the one that arrives with a plan you can turn into orders once, a limit price, a stop and a target, and then leave to work. One warning there: many brokers run stop orders only in regular hours, 9:30am to 4pm ET, so a stop may not trigger before the open or after the close.
Four questions before you trust an alert service
- Can I see every alert it ever sent, losers included? A list of winners proves nothing, because any service can choose its best five trades.
- Is the rule written down? "Our AI spots momentum" is not a rule. A rule is something you could test yourself.
- Does each buy arrive with its exit? If not, your results and the record will drift apart.
- Are costs in the published figures? Many records leave out commissions and spreads. If so, a real account will do worse than the record.
A longer checklist, with the main services side by side, is in the comparison of small cap alert services.
Where Ignition fits
Ignition's alerts are trade alerts, not price alerts you set yourself and not news alerts. Two rules-based books buy when their written rules pass, and every buy and every sale goes out by email and Telegram as it happens. The Small Cap book's buy note arrives at 3:30pm ET with the price it bought at, and its stop and targets rest as orders from 4am to 8pm ET. Each Large Cap buy note states its own exit, a target, a stop or a timed sale, at the moment of the buy. You can read how the method works rule by rule, and every trade both books have made, losses included, is in the complete public track record.
Written rules do not remove the risk. Most small and low float stocks lose money, many of the Small Cap book's trades close at a loss, the published figures leave out trading fees, and past results are not a promise about the next trade.
- Every alert has a trigger, a check and a delivery, and real time can describe any one of the three.
- Free price alerts watch one condition on stocks you already know; they cannot find stocks for you.
- News alerts are fast but unfiltered, and the smallest stocks often have no news at all.
- A useful trade alert arrives with its exit, from a service that publishes every result, losers included.
Risk disclaimer: low-float and micro-cap stocks are among the most volatile, illiquid securities in the market; total loss is possible and nothing in this article is financial advice. Ignition Alerts is a research tool - it never tells you to buy or sell. Read the full risk disclosure.
Frequently asked questions
Are stock price alerts free?
Yes. Basic price and percent move alerts are free in most broker apps and on the large free stock websites. What usually costs money is a service that checks the whole market against several rules at once and publishes what its alerts did afterwards.
What is the difference between a news alert and a trade alert?
A news alert tells you something was published about a stock. A trade alert names a stock, a price and a plan, usually because a set of rules passed. The first is information. The second is a record of a decision, and its results can be counted.
How fast does a stock alert app reach you?
It depends on three things: how fresh its prices are, how often it tests your trigger, and how it delivers the message. Push is usually fastest, email can sit in a queue, and your own reaction time is often the biggest delay of all.
Can a stock alert tell me what to buy?
No. An alert reports that its trigger fired at one moment. It does not know what the price will do next or what you can afford to lose. Most small and low float stocks lose money, and no alert changes that.