What is RSI?
RSI is an oscillator that moves within a bounded range from 0 to 100. It compares recent gains and losses over a chosen lookback period and turns that information into a momentum reading.
Momentum
RSI indicator explained
The Relative Strength Index, usually called RSI, measures the speed and magnitude of recent price changes. Traders often use it to monitor momentum strength, possible overbought or oversold conditions, and shifts in momentum.
How it works
When gains have been relatively strong over the lookback window, RSI rises. When losses have been relatively strong, RSI falls. Reference zones such as 70 and 30 are common, but their meaning depends on market context and timeframe.
How traders often interpret it
A higher RSI can suggest stronger recent upward momentum, while a lower RSI can suggest stronger downward momentum. Extreme readings do not mean price must reverse; strong trends can keep RSI elevated or depressed for extended periods.
What it can be useful for
- monitoring momentum strength
- watching threshold crosses
- spotting possible momentum exhaustion
- comparing momentum across timeframes
Indicators it pairs well with
Bollinger Bands add volatility context to RSI readings near common extremes.
EMA direction can provide broader trend context for an RSI condition.
Volume helps describe the participation behind a momentum change.
Using RSI in AlertoWatch
Turn the indicator relationship into a precise monitored condition. These are plain-English rule ideas, not recommendations or promises about market outcomes.
- Alert me when RSI rises above 70 on 1h.
- Alert me when RSI drops below 30 on 4h.
- Alert me when RSI crosses above its moving average.
- Alert me when RSI is above 50 while price is above EMA 200.
Limitations
RSI summarizes historical price movement and can remain extreme in strong trends. A threshold reading alone does not confirm a reversal, continuation, or trade opportunity.
FAQ
Does RSI predict reversals?
No. RSI measures momentum. Extreme readings may be useful context, but a reversal is never guaranteed.
Why are 70 and 30 commonly used?
They are conventional reference levels for possible overbought and oversold conditions, not universal rules.
Can RSI be combined with other indicators?
Yes. It is often paired with trend, volatility, or volume context.
Can I create an RSI alert in AlertoWatch?
Yes. The current alert builder supports RSI-based conditions, subject to plan entitlements.