The reviews describe playback cutting out after updates and imported sound going missing. Testing the backdrop, saving the preset and carrying settings over all help.
Relax Melodies remains one of the best soundscape builders: flexible sound mixing, binaural beats, and a long-term audience that uses the app for more than just sleep. Occasional iOS compatibility failures spoil the experience for longtime stable users.
評価点：A flexible mix editor lets you create a personal sound backdrop and use the app for sleep, work, and meditation.
不満点：After iOS updates the sound often cuts out mid-night, and previously downloaded tracks need to be re-downloaded.
向いている人：People who want a custom sound mix for sleep and focus
White Noise Deep Sleep Sounds offers a wide library of quality sounds including binaural beats, and the free set is sufficient for regular use. A critical hardware-specific issue: the app causes overheating and limits charging to 80% on certain devices when running all night.
評価点：Binaural sounds are regularly cited as the fastest way to fall asleep in 8 to 10 minutes.
不満点：No sequential playback, only simultaneous mixing, which is inconvenient for anyone who wants to change their background sound during the night.
向いている人：People who need a rich selection of nature and technical sounds without tracking
One of the richest sound libraries, with the ability to blend tracks and adjust the volume of each individually. Loops are stitched without audible seams, which sets this app apart from competitors. The interface is unintuitive and confusing at first.
評価点：Sound loops are seamlessly joined, and the ability to mix multiple layers with individual volume control gives precise personal tuning.
不満点：Library navigation is confusing and it is hard to save and find custom mixes.
向いている人：Audiophiles and people with tinnitus who need precise control over background sound
One of the best atmospheric sound mixers: flexible mixer, support for custom recordings, and background mode all work well. The loss of user recordings after updates and the disappearance of the import feature noticeably damaged the experience for loyal users.
評価点：The mixer lets you build exactly your own atmosphere from multiple layers and listen over music or podcasts.
不満点：Imported sounds periodically disappear from saved scenes after updates.
向いている人：People who want to create personal sound atmospheres for sleep or focus.
BetterSleep is a strong sound mixer with a flexible timer and a broad library, but the abrupt move of previously free presets behind a paywall destroyed loyalty among longtime users. The product itself sounds good when you have access.
評価点：The ability to blend multiple sounds into one preset and save it is a unique mechanic among competitors.
不満点：There is no guarantee that a sound you have gotten used to will still be in the free tier tomorrow.
向いている人：People willing to pay for a custom personal sound backdrop builder
