fastsleep.app
Easy to use. Simply close your eyes and imagine the micro-scenarios you hear. Like if you hear "moonlight on a white flower", imagine that scenario until you hear the next one.
(You may also use it to easily break nightly doomscrolling habit)
I agree with the other comment that having the screen turn turned off, would be nice.
The lever with the most evidence behind it is not the bedtime ritual but a fixed wake time plus real morning light, since that sets when sleep pressure and melatonin line up. A wind-down audio can help with the cognitive arousal part; it cannot move the phase.
Two product notes: audio-only with the screen off, and a hard stop at the end. Anything still running after you doze off turns into a tracking task.
The habit most people skip, because it feels like giving up: one line telling the user that if it has not worked after ~20 minutes, get up and do something dull under low light. Stimulus control is unglamorous and it is the part of CBT-I that consistently holds up.