Harmonic Signal Alerts MT4
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Harmonic Signal Alerts MT4 is a free indicator for MetaTrader 4 that finds ABCD, Gartley and Bat patterns on the chart. When price reaches a pattern's potential reversal zone, it draws the XABCD lines, the zone and an arrow. It can also alert you.
It works only from swings that are already confirmed and from closed bars. A pattern is drawn on the bar where it became known. It is never moved or removed afterwards.
MetaTrader 4 edition: the same calculation and the same arrows as the MetaTrader 5 version. Only the arrow distance is set as a fraction of ATR, because MetaTrader 4 cannot shift arrows by pixels.
Quick start
- Attach the indicator to a chart. It scans the last 3000 closed bars.
- Leave the swing bars (10 / 5) and the 5% tolerance as they are, or switch off patterns you do not want.
- Look for the arrow on the bar where a pattern reaches its reversal zone.
- For alerts, switch on sound, push notification or e-mail in the inputs. The pop-up is on by default.
Standalone: everything is built in. You do not need to buy or install any other product named on this page.
How it finds a pattern
- Swings: a swing high is a bar higher than the 10 bars before it and not lower than the 5 bars after it (both adjustable). A swing is known 5 bars after it formed, and the indicator waits for that.
- Ratios: the standard Fibonacci ratios of each pattern, with an adjustable tolerance (5% by default).
- Reversal zone: the pattern's D level plus and minus 3% of the XA leg (of the AB leg for ABCD).
- Completion: the first closed bar that reaches the zone. If price had already closed beyond the zone, or went past point C, there is no pattern.
On the chart
- XABCD lines with point labels and the pattern name.
- The reversal zone as a box.
- Arrow on the bar the pattern completed. Buffers give arrows and pattern types to other programs.
- Alerts on the newest closed bar: pop-up, sound, push notification, e-mail.
Inputs
| Input | Default |
|---|---|
| ABCD, Gartley, Bat | on |
| Swing bars left / right | 10 / 5 |
| Ratio tolerance | 5% |
| Reversal zone half-width | 3% of XA |
| Bars to scan | 3000; lines, zone and labels on or off; colours |
| Arrow distance from the candle | 0.3 x ATR(14) |
Good to know
- A pattern appears only after its swings are confirmed. It is shown a few bars after the turning points, never earlier.
- Ratios and tolerances differ between authors. These are the commonly published values.
- How often: on 2023-2026 broker history with the default settings, about 2-3 patterns per symbol per month on H1. M15 gives about 10 and H4 less than one.
Related products
- Harmonic Signal Alerts: the same indicator for MetaTrader 5.
- All my products on MQL5
If it helps your trading, a short review on this page helps other traders find it.
Questions: use the comments on this page or send me a message on MQL5.
Trading involves risk. A pattern is a chart shape, not a prediction; this indicator does not tell you to buy or sell.
