Sleep Cycle, BetterSleep, Sleep as Android and Sleepo compared — smart alarms, sound mixes and tracking for falling asleep and waking gently.
Sleep problems come in two distinct shapes that need different tools: lying awake unable to switch off, and sleeping through the night yet waking exhausted with no idea why. Sound mixes and routines treat the first; measurement treats the second, and installing a tracker when you really need a wind-down is the usual reason a sleep app disappoints. The two apps reviewed in depth below were picked one for each job, and the questions also weigh Sleep as Android and the place of wearables, so the comparison covers the full toolkit for 2026.
Sleep Cycle tracks through the phone's microphone — no wearable required — and wakes you in light sleep inside a chosen window.
It listens for movement and breathing overnight to infer your sleep phases, then fires its alarm within a time window you set when it detects light sleep rather than dragging you out of deep sleep at a fixed minute, which makes getting up noticeably less brutal. It also records snoring and coughing during the night, and the phone simply sits on the nightstand. The trade-offs are accuracy and privacy: microphone inference has its limits, the full statistics require a subscription, and leaving audio recording all night understandably unsettles some people even though processing happens on the device.
BetterSleep is for switching off: blendable rain, storms and white noise, plus sleep stories and meditations, with no pretence of tracking.
Everything revolves around sound. You build custom mixes from rain, storms, white noise and ambient soundscapes, layering them at whatever balance you like, and the library adds bedtime stories and guided meditations for nights when thoughts keep circling. It deliberately makes no serious attempt to measure your rest, which keeps the interface focused on the one problem of falling asleep. The content library is large but a substantial share sits behind payment, playing audio all night can drain the battery, and anyone who needs diagnosis rather than relaxation should look at a tracker instead.
Download price only. In-app purchases and subscriptions may cost extra.
Questions & answers
Is phone-based sleep tracking reliable?
It is useful for trends, not diagnosis. These apps infer sleep phases from movement and sound, whereas clinical measurement means polysomnography with electrodes. They are perfectly good for noticing that you sleep less on weeknights or that alcohol worsens your rest; they cannot diagnose a sleep disorder.
What is a smart alarm?
Instead of a fixed time, you give it a window around thirty minutes wide and it rings when it detects light sleep within it. Waking from deep sleep causes that half-hour grogginess; waking in a light phase reduces it noticeably. Sleep Cycle and Sleep as Android both include one.
Is leaving the phone recording all night a privacy problem?
It is the main objection and a reasonable one. Sleep Cycle and Sleep as Android process the audio on the device and do not upload it, though it is worth confirming in the settings. If it still unsettles you, a fitness tracker measures movement and heart rate without a microphone, or you can simply use the sound side.
What actually helps when you cannot fall asleep?
Sound apps help at the margin, but habits do the real work: consistent bedtimes, no screens in the final hour, caffeine only in the morning, and using the bed only for sleep. If insomnia lasts for weeks and affects daily life, see a doctor — effective treatments exist, and no app replaces them.
More related apps
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