The program is fully compatible with Accessibility tools like Voice Over and can be controlled through an assistive device using Applescript. Most, if not all, user interface elements are accessible through AppleScript.
Most, if not all, functionality's are manageable through the keyboard to facilitate use for people having difficulties using the mouse or trackpad (see keyboard shortcuts)
People having difficulties using colors can change for more contrasted colors using the options panel. Also, you have the option not to fill white candlesticks, providing a color independent way to recognize the type of candlesticks.