I notice you've got a thread for ukulele and just wanted to register interest in the same feature for mandolin. The iReal apps are already useful for me but this would make them much more so. Thanks
Perhaps a more unified perspective would benefit many more users.
Since the same chord shapes could serve mandolins, violins, violas, cellos, tenor banjos, tenor guitars as well as other instruments, all that would be needed is the ability to adjust the label of the diagram independently of the chart to accommodate instruments with different string lengths.