Build a mix, save it, play it again tomorrow

The current version lists 60 sounds in seven groups: noise, weather, water, nature, machines, places and ambience. Twelve are free: White, Pink and Brown noise, Fan, Light Rain, Wind, Stream, Shower, Crickets, Forest, Airplane Cabin and Train Ride. The other 48, including everything in the Places and Ambience groups, need Pro.

Each sound has its own level from silent to full, and a master volume sits above them so you can make the whole mix quieter without losing the balance you built. SleepMix stores both on the phone, so the mix comes back as you left it the next time you open the app.

App sounds are bundled recordings that loop without an audible gap. Some entries are variations of the same recording at a different starting level, so treat the count as a list of options rather than 60 separate recordings. The generator on this website is different again: it creates white, pink and brown noise in your browser and uses no recordings at all.

When a blend works, save it as a preset and give it a name. Free users can keep up to three presets; Pro removes the limit. Presets are saved on the phone together with your other settings.

A preset is the quickest way back to a known mix at bedtime: open the app, tap the preset, then set the timer. Small changes, such as a quieter fan on a warm night, are easier to judge when everything else stays the same.

The first time you open SleepMix, it asks what you want help with and which kind of sound you like: rain, beach, forest, white noise or fireplace. It then builds a two-sound starter mix, for example Light Rain with Wind or White Noise with Fan, picks a timer length from your answer and saves the mix as a preset.

Think of the starter mix as a first draft. The questions choose sounds; they do not measure anything about your sleep. Adjust each slider afterwards and lower the master volume if the mix feels loud at the pillow.