Classic Crab Harmonic Pattern Indicator Download for MetaTrader 4 – Free – [TFlab] – MT4/MT5 Resource

On July 1, 2025, in version 2, the indicator added alerts/notifications and signals functionality

The Classic Crab Harmonic Pattern indicator is designed for the MetaTrader 4 trading platform and is used to identify the classic Crab Harmonic pattern in price charts.

The Crab harmonic pattern is one of the most widely used patterns in technical analysis , introduced by Scott Carney in the year 2000 .

The pattern’s structure is based on five key points: X , A , B , C , and D . In this MetaTrader 4 Harmonic Patterns indicator , bullish patterns are displayed in pink and bearish patterns in blue .

Classic Crab Harmonic Mode Indicator Table

The characteristics of the classic Crab harmonic morphological indicators are summarized in the following table:

Indicators at a glance

In the Crab Pattern , Fibonacci ratios determine price reversal points. The AB wave is traced back between 38.2% and 61.8% of XA , and the BC wave is located on one of the layers 38.2% or 88.6% of AB .

Next, the CD wave extends depending on the correction BC , up to 224% or 361.8% of it. Finally, the CD wave relative to XA should be 161.8% , which is considered the Price Reversal Zone (PRZ) .

Indicators are in an upward trend

The image below shows the AUD/CAD pair on the 1-minute timeframe . The indicator automatically identifies the Bullish Crab pattern and marks key points X , A , B , C , and D on the chart.

Point D is considered the Price Reversal Zone (PRZ) , and traders can enter a buy position after confirming the necessary signals.

Indicators are in a downward trend

In the CAD/CHF pair chart , the indicator automatically recognizes the Bearish Crab pattern and displays it in blue .

Point D is designated as the reversal zone, and after confirmation of reversal signs, sell trade can be initiated.

Classic Crab Harmonic Mode Indicator Settings

The setting part of the classic Crab harmonic form indicator is shown in the figure below:

• Minimum Wavelength (Candles) : Minimum wavelength expressed in number of candles
• Number of previous candles : number of previous candles used for analysis
• Show Lines : Show or hide pattern lines
• BreakPivot : Check if the pivot is broken
• Original Pivot to Broken Pivot (Pipette) : The distance between the original pivot and the broken pivot (in points)
• Shift : The amount of data change on the chart
• BullishPattern : Identify Bullish Harmonic Patterns
• BearishPattern : Identify bearish harmonic patterns
• Style Of Line : Set the style of the lines on the chart
• Width Of Line : Set the thickness of the displayed line
• Custom Color Lines (Bearish Harmonic) : Change the color of the bearish pattern lines
• Custom Color Lines (Bullish Harmonic) : Customize the color of the bullish pattern lines
• Custom text color : Set the color of displayed text

Conclusion

The Classic Crab Harmonic Pattern Indicator is designed to automatically detect Crab harmonic patterns in price charts.

Identifying bullish and bearish patterns , drawing the pattern lines with styles and marking the entry area at points D is its main feature.

This classic chart pattern indicator for MetaTrader 4 is used for more precise analysis of harmonic patterns and identification of potential price reversal zones in financial markets such as Forex .