Music Scales app will tell you everything about notes, intervals, chord structure and scales. Simply ask "tell me the notes of B flat phrygian" in order to get a list of notes of that scale. You can also ask e.g. "what's the scale F sharp G sharp B flat C D sharp" and it will detect it as a D# minor six pentatonic scale.
If you're interested in finding an interval, you can ask to "find an interval between C and G sharp".
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