For some time now, Philips Hue has been working on making its separate apps redundant. Since the end of February, it has been possible to pair Hue lights within the Hue app via Bluetooth and no longer have to use the separate Bluetooth app.
Back in March, I reported that Philips Hue had also started work on integrating the Sync Box into the regular Hue app. Now this work seems to be almost completed. Already with the next update, the Philips Hue HDMI Sync Box could be completely controllable via the Sync section of the Hue app.
What's already clear is that there doesn't seem to be a hard transition from the old, separate apps. Although the Bluetooth functionality was already integrated into the Hue app in February, the separate Bluetooth app is still available and even received an update in March. It can be assumed that the separate Sync app will also remain in the App Store for some time.