A momentum oscillator that measures the speed and strength of price moves on a 0–100 scale.
The Relative Strength Index (RSI) is a momentum oscillator developed by J. Welles Wilder. It compares average gains and losses over a period (default 14) and produces a value between 0 and 100. Values above 70 are classically read as overbought (potential sell signal), values below 30 as oversold (potential buy signal). More important than the fixed thresholds are RSI divergences: when price prints a new high but the RSI does not, that's a warning sign for a possible reversal. Suna AI Vision recognises RSI setups on any uploaded chart.
EUR/USD climbs to a fresh 4-week high, but the RSI on H1 only reads 62 instead of the expected 75 — bearish divergence, often a precursor to a correction.