I think every good trader needs a quality trading journal. If someone can create quality trading journal I believe people will be willing to pay. Not sure about technicalities. Some data collection may be automated with support from brokers. Others might require input from users. Some of the features I would like it to have:-
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Ability to categorize trades based on strategy
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Max drawdown average loss etc of strategy and portfolio
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Tax calculations
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Weekly monthly and yearly reporting
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Quality charts to analyze growth and performance