Surprisingly bad
For a broker that tends to cater to active traders, this apps charting abilities are probably one of the worst in the industry. Im not looking to actively trade from a mobile but charts on this app are ridiculous. Could take a few cues from most other brokers. Maybe more customization of charts, fluid price action, etc. For a clue these developers could try checking out think or swim, Oanda or many others apps.
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IBKR Mobile - Invest Worldwide