Slo vs Noizio: Which Ambient Sound Mixer Fits? (2026)

Choose Slo if you want to audition sounds and build mixes in the browser before installing anything; choose Noizio if its one-time full-library unlock and iCloud mix sync between iPhone and Mac fit how you buy and listen.

Disclosure: Slo is made by the team publishing this comparison. Noizio facts come from its current App Store, Google Play, and privacy-policy pages, checked July 31, 2026. Noizio has multiple platform listings with different histories, so unresolved parity questions are marked rather than guessed.

The short verdict

Choose Slo if you want to audition sounds and build mixes in a browser, or you prefer a larger verified library with straightforward iOS, Android, and Mac download paths. Choose Noizio if you want its compact 40+ sound set, one-time unlock model, offline playback as stated in its listings, or the iOS–Mac mix-sync behavior documented in its Apple version history.

The important caveat is Noizio’s platform structure. Its iOS, separate Mac, current Android, and legacy Android listings do not present one clearly identical product. Treat each store version as its own purchase and feature check.

Slo vs Noizio at a glance

Decision	Slo	Noizio
Verified sound count	151 curated sounds	40+ on current iOS and Android listings
Main workflow	Players, layer mixer, and curated presets	Choose sounds, set each volume, save mixes
Browser path	Yes	No official web player found
iPhone/iPad	Download path available	Current App Store listing
Android	Download path available	New 2026 listing plus a separate legacy listing
Mac	Download path available	Separate Mac listing; iOS listing also reports Apple-silicon Mac compatibility
Offline claim	Not verified for Slo apps	Stated by Noizio’s current listings
Payment model	Check current store terms	Store pages describe a one-time full-library unlock

Exact prices are omitted because they vary by platform, region, and store. The model matters more here: Noizio describes a one-time unlock, while Slo’s current app terms must be checked in the relevant store.

What Slo offers

Slo’s current product source describes 151 curated sounds for focus, sleep, and relaxation. The website provides individual players with volume and timer controls, a multi-layer mixer, and curated presets. That browser path lets you test brown, pink, and white noise alongside rain, rivers, fire, and other environmental layers without installing an app.

Slo also provides download paths for iOS, Android, and Mac. This comparison does not claim offline playback, automatic sync, or identical features across those platforms because the current product ledger does not verify them.

What Noizio offers

Noizio’s current iPhone/iPad listing describes 40+ ambient sounds, per-sound mixing, seamless loops, background audio, an auto-pause timer, offline playback, and a store for added sounds. Its version history documents mix synchronization between iOS and macOS. A separate Mac App Store product lists mixing, offline playback, an auto-pause timer and alarm, hotkeys, and improved synchronization with iOS.

The Android picture needs more care. Google Play currently exposes:

• a redesigned package updated June 16, 2026, with 40+ sounds, saved mixes, a fade-out timer, offline playback, and a one-time library unlock; and
• a legacy package last updated in 2020, with five included sounds and an older feature set.

Those two listings make “Noizio on Android” too broad to describe as one version. Confirm the package name and update date before buying or comparing features. Noizio’s current privacy page says the product uses a one-time in-app purchase to unlock all sounds, but exact store terms remain platform-specific.

The differences that matter

Browser use

Slo has live browser players, mixes, and presets. We did not find an official Noizio browser player. If you work on a managed computer or want to test a sound before installation, this is Slo’s clearest practical advantage.

Library size and selection

The verified figures are 151 for Slo and 40+ for current Noizio listings. Noizio covers noise colors, weather, nature, urban environments, and tonal wave tracks. Slo offers a larger curated pool. Count alone does not establish recording quality, so check the specific sounds you use.

Apple sync and Mac packaging

Noizio’s App Store history explicitly records mix sync between iOS and macOS. Slo does not have a verified cross-device sync claim. Noizio also has a separate Mac listing, while its iOS listing says it can run on newer Apple-silicon Macs. These routes may not have identical purchases or behavior; check the exact listing you plan to install.

Android ambiguity

Slo provides one current Android download path from its website. Noizio has both a newly redesigned Android listing and a legacy listing. The current package looks substantially updated, but the coexistence of both pages means reviews, purchases, and feature descriptions may refer to different apps.

Offline playback and payment

Noizio explicitly states offline playback and a one-time unlock. Slo’s verified article facts do not support an offline claim or a specific plan description, so those cells remain unclaimed. If either feature decides the purchase, verify it on the exact device and store page.

Which one should you choose?

Your priority	Better first test	Why
Mix in a browser	Slo	The browser mixer is live
More verified sound choices	Slo	Current source says 151 versus Noizio’s 40+
One-time full-library unlock	Noizio	Current Noizio pages describe that model
Verified offline playback	Noizio	Its store listings state it directly
iOS–Mac mix synchronization	Noizio	Apple version history documents it
Android without package ambiguity	Slo	Noizio has current and legacy Android listings

For sleep or concentration, compare the same room and task at a low volume. A larger catalogue and saved sync do not prove a better outcome. See how to use sound mixing for a simple setup.

Slo presets

Compare a natural loop with a deeper work mix

Rain on a Roof is the simpler scene. Deep Work Studio uses a steadier noise base. Keep the one that fades from attention.

Rain on the Roof

Two depths of rain gather above a quiet room, steadied by a neutral grey hush.

• Ambient Rain 50%
• Gentle Rain 34%
• Grey Noise 20%

Play this mix View details

Deep Work Studio

A low noise floor, spacious focus ambience, and barely audible keys for a settled desk.

• Brown Noise 48%
• Deep Focus 32%
• Keyboard Typing 9%

Play this mix View details

Frequently asked questions

Is Noizio available on Android in 2026?

Yes, but two Google Play packages remain visible: a redesigned app updated in June 2026 and a legacy app last updated in 2020. Confirm the package and date before using old reviews or feature claims.

Does Noizio work on Mac?

Yes. A separate Mac App Store listing exists, and the iOS listing also reports compatibility with qualifying Apple-silicon Macs. Purchase terms and features may differ between those routes.

Does Noizio sync mixes between iPhone and Mac?

Its App Store version history says it added iCloud mix synchronization between iOS and macOS. We have not independently tested current sync behavior.

Can I use Slo or Noizio in a browser?

Slo has verified browser players, a mixer, and presets. We did not find an official Noizio web player during the July 2026 audit.

Which has more sounds?

Slo’s current product source says 151 curated sounds. Noizio’s current iOS and redesigned Android listings say 40+. The useful choice still depends on whether the exact sounds you want are present.

Official sources checked July 31, 2026

• Noizio, current iPhone/iPad App Store listing — 40+ sounds, mixing, timer, offline playback, Mac compatibility, and version history.
• Noizio, separate Mac App Store listing — Mac-specific controls, timer/alarm, offline playback, and iOS synchronization notes.
• Noizio, current Android listing — June 2026 redesign, 40+ sounds, saved mixes, timer, offline use, and unlock model.
• Noizio, legacy Android listing — separate package and 2020 update history.
• Noizio, official privacy policy — current ownership/privacy statement and one-time unlock description.
• Slo, live browser players, mixer, presets, and current product source — claims checked July 31, 2026.

Related comparisons and guides

• Best sound mixing apps
• Slo vs Dark Noise
• Brown, white, and pink noise compared
• How to create a sleep soundscape

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