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Bar-close vs intrabar alerts in TradingView: when each one misleads you

TradingView lets you set alerts to trigger once per bar close, once per bar, or every time the condition is met. The difference matters more than people think.

Intrabar alerts fire as soon as the condition is true during the bar. That's fast, but on a candle that's still forming, the condition can come true and then become false again before the bar closes. If your alert is for price crossing above a moving average, an intrabar alert might fire on a spike that reverses within seconds. You get notified about a cross that never happened on the closed chart.

Bar-close alerts only fire when the bar closes with the condition true. That matches what you see on historical charts, which is what most strategies are built on. The cost is a delay of up to one full bar. On M1 that's a minute, on M15 it's up to fifteen minutes.

For indicator based conditions, intrabar alerts can also be affected by repainting. An indicator that recalculates on each tick might trigger an alert and then show no signal on the closed bar.

My rule is to match the alert to how the strategy was designed. If the strategy uses closes, use bar-close alerts. If it relies on touches of a level, intrabar can make sense.

If you use a higher timeframe condition on a lower timeframe chart, using functions that look at another timeframe's data, the alert can behave differently than you expect. An alert based on H1 data on an M5 chart might fire on M5 bar close while the H1 bar is still forming. If the H1 condition later changes before its own close, the alert fired on something that didn't hold. It's one of the easier ways to end up with alerts that don't match the historical chart. If you rely on those, check the alert on a few historical examples first and see whether it matches what the closed bars show.

A practical habit that helps: when you set up a new alert, keep a note of each time it fires for a week and compare it to the chart afterwards. You'll quickly see whether it's firing on conditions that hold, or if a lot of alerts are coming from spikes or repaints. It's tedious, but it's better than finding out after acting on false alerts in live trading. I'd also check the alert's expiry date, since TradingView alerts can stop working without much notice. A quick weekly look at the alert list stops that from catching you out.