As far as I know, QMX is HF only. Both Packet Commander and RadioMail currently have a built 1200 baud AFSK modem, which is designed for VHF/UHF, not HF.
From what I understand, QMX presents itself as a sound card that iOS might recognize. However, PTT control requires USB serial communication, which isn’t allowed under Apple’s restrictions.
For QMX to work with iOS, a few things would need to change:
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QMX would need a VOX-style PTT approach (similar to Digirig Lite)
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RadioMail would need to support an HF-appropriate digital mode
VARA HF and Robust Packet are proprietary, so they’re not viable options. That leaves 300 baud packet and ARDOP. Built-in ARDOP Modem is being considered in the future.