Slo vs myNoise: Which Sound Generator Fits You? (2026)

Pick Slo if you want a background you can set in about a minute, with 200+ recorded sounds, 89 of them free, any number of layers at once and a timer that fades out after up to 24 hours. Pick myNoise if you enjoy adjusting a sound band by band across its 300+ evolving soundscapes.

The short answer

You’re deciding between a tidy library and a set of controls. Slo fits if you want 200+ recorded sounds with 89 of them free, a mixer that takes as many layers as you like, and a sleep timer you can set between 15 minutes and 24 hours. myNoise fits if you want a larger catalogue, scenes that keep changing while they play, and the patience for an interface with more knobs on it.

Both can give you a useful background, so the honest question is how much tuning you want to do before you get on with your evening. Neither one is a treatment for anything.

How we compared. The myNoise facts here come from its official website and current Google Play listing, checked July 31, 2026. Nothing was measured in a lab or over weeks of nightly use. Slo is our own app, and its numbers come from the app source, version 3.132, on September 14, 2026. Neither app can promise you better sleep.

Slo vs myNoise at a glance

Decision	Slo	myNoise
Library	200+ sounds in the app, 89 free; 180 free in the browser	300+ soundscapes in the current Android listing
Main control	Any number of layers, a volume per layer, saved mixes	Layer controls plus generator-specific spectral shaping
Browser use	180 sounds, a mixer and 36 presets, no account	Full website catalogue and generators
Evolution	Depends on the selected sound or preset	Official listing says soundscapes continuously evolve
Best for	A mix that runs all night on a timer of 15 minutes to 24 hours	Fine-tuning and exploring many generators
Main tradeoff	No per-frequency calibration controls	More controls to understand
Payment comparison	Monthly, yearly or one-time lifetime	Donation-supported website; mobile full access offered as a one-time unlock

You won’t find exact amounts in that table. Store prices move by country and by promotion, so read the checkout screen on your own device before you decide.

What Slo offers

Slo ships 200+ recorded sounds, and 89 of them stay free. Its noise section holds 22 recordings across seven colors, five of those brown, and 11 rain tracks and 9 water tracks sit beside them. You can stack as many layers as you like, give each one its own volume, and Slo remembers the balance for every combination you build. A mix you save exports as a file that imports on another device. Set the sleep timer anywhere from 15 minutes to 24 hours, and the sound fades out over 15 seconds to 2 minutes before it stops. On an iPhone or an Android phone, playback runs as a background audio service, so the controls stay on the lock screen. A sound you play in the app downloads once and then lives on the device, so a saved mix keeps going with no network. The full library costs a monthly or yearly subscription or a one-time lifetime purchase, and slonoise.com plays 180 sounds free with no account.

Slo has no frequency sliders and no hearing calibration. If you want to cut one narrow band out of a noise, myNoise is the product built for that job.

What myNoise offers

myNoise is maintained by sound engineer Stéphane Pigeon. Its official site describes adjustable soundscapes for focus, relaxation, and sleep on an ad-free website that runs on donations. Its current Android listing says the app holds 300+ customizable soundscapes, from nature and urban ambience to tonal drones, synthetic noises, and musical environments.

Its controls go further than a volume mixer. The White Noise & Co generator exposes frequency-shaped presets, including white, pink, brown, and grey, alongside calibration and animation controls. Other soundscapes let you balance the pieces of a scene, such as waves, wind, or insects. The official mobile listing says the soundscapes evolve continuously and that full app access comes through a one-time purchase, with no subscription.

myNoise links to iOS and Android apps from its official website. If you listen at a desktop, the route we can verify is the website, so this page doesn’t claim a separate native Mac app.

The differences that matter

Simple layers or deeper controls

Every Slo sound works the same way, so a session starts with picking a layer and setting how loud it is. myNoise treats a soundscape more like an instrument, with components that belong to that particular scene and, on some pages, frequency controls. If rain over brown noise at two volumes is what you’re after, Slo gets you there quicker. If you want to pull one narrow band out of a noise, myNoise is the one to try first.

Library scale

The current figures are 200+ recorded sounds for Slo, 89 of them free, and 300+ soundscapes in myNoise’s Android listing. The two totals don’t count the same thing, since a Slo sound is one layer you can mix while a myNoise soundscape can hold several adjustable parts. Read them as a sign of how much material each app holds and nothing more.

Calibration and animation

myNoise’s generator pages carry calibration and animation controls, which help if you like shaping a sound or keeping a scene moving while it plays. Slo stops at choosing a layer and setting its volume, and it has no hearing calibration.

Browser and app access

Both products play in a browser. Slo also has iOS, Android, and Mac download paths, while myNoise links its iOS and Android apps and serves desktop listeners through the website. Don’t assume a saved state or a particular control carries across versions of either app unless the product says so.

What each one costs

myNoise’s website is donation-supported, and its 2026 Android listing says the app is ad-free, has no subscription, and gives full access through a one-time purchase. Slo sells its full library as a monthly or yearly subscription or a one-time lifetime purchase, and 89 of its 200+ sounds stay free without any of that. The two models are genuinely different, and you can see that without a number in front of you, which is good, because any number written here would be wrong for someone reading it next month in another country.

Which one should you choose?

Your priority	Better first test	Why
A usable mix in under a minute	Slo	Every sound works the same way, on and volume
Adjusting frequency bands	myNoise	Its generator pages carry those controls
The broadest catalogue	myNoise	Its current listing says 300+ soundscapes
Curated focus and sleep presets	Slo	The 36 browser presets come already balanced
Scenes that keep changing	myNoise	Continuous evolution is a feature it advertises
A browser test before installing	Either	Both play on the web without a download

If you’re choosing for concentration, do the same 20-minute task in each app and once in silence, then count the work you finished and the mistakes you made. Preference alone will mislead you. Our guide to the best sounds for focus walks through that test.

Slo presets

Compare a two-layer sleep mix with a moving focus mix

Both of these show how Slo works. You get named layers with a volume each, and there's no frequency setup to learn first.

Rain and Brown Noise for Deep Sleep

Brown noise covers the traffic and the boiler, and rain softens the sharper sounds inside the room.

• Brown Noise 65%
• Rain 38%

Play this mix View details

River and Green Noise for Focus

Running water with a steady hiss underneath, for a desk where the room keeps interrupting you.

• Green Noise 60%
• River 35%

Play this mix View details

Frequently asked questions

Is Slo a direct myNoise alternative?

For covering noise and building a background you can mix, yes. On controls, no, because Slo has no frequency shaping and no hearing calibration, and it doesn’t cover myNoise’s full generator catalogue.

Which has more sounds?

myNoise’s current Android listing says 300+ soundscapes. Slo ships 200+ recorded sounds in the app, 89 of them free, plus 180 free in the browser. The two counts measure different things, so neither number tells you which one sounds better to you.

What does the myNoise app cost?

Its July 2026 Android listing says the app is ad-free, carries no subscription, and gives full access through a one-time purchase, and the website runs on donations. Terms differ by region, so open the current store page before you buy.

Can I use both in a browser?

Yes. Slo plays 180 sounds in a browser with no account, along with a mixer and 36 saved presets. myNoise started on the web and still keeps a large catalogue of adjustable generators there.

Which is easier for beginners?

Slo gives every sound two controls, on and volume, and its 36 browser presets arrive already balanced. myNoise hands you more controls and expects you to learn them. Which one feels easier depends on whether you enjoy tuning a sound or would rather press play once.

Official sources checked July 31, 2026

• myNoise, official website — web access, project ownership, adjustable soundscapes, mobile links, and donation-supported model.
• myNoise, White Noise & Co generator — noise presets, calibration, animation, and browser controls.
• myNoise, official Google Play listing — 300+ soundscapes, continuous evolution, Android access, no-subscription and one-time-unlock description.
• Slo app source, version 3.132 (sound list, timer, fade-out and store products), and the slonoise.com sound catalogue, reviewed September 14, 2026.

Related comparisons and guides

• Complete guide to noise colors
• Science behind brown noise
• Slo vs Dark Noise
• How to use sound mixing

Filip Kowalski is the developer of Slo and writes about sound, sleep, and focus.