Slo vs Noizio: Minimalist Sound Apps Compared (2026)

Feature	Slo	Noizio
Brown Noise	✓	✓
White Noise	✓	✓
Sound Mixer	✓	✓
Sleep Timer	✓	✓
Sound Library	70+	40+
iCloud Sync	—	✓
iOS App	✓	✓
Android App	✓	Separate version
Mac App	✓	✓
Free Tier	✓	5 sounds free
Price	Free / Premium	$2.99 one-time

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Overview

Slo and Noizio are both minimalist ambient sound mixing apps that prioritize clean design and sound mixing. They share a similar core philosophy: provide quality ambient sounds in a simple, uncluttered interface. However, they differ in library size, platform strategy, sync capabilities, and pricing. This comparison examines how these two apps compare across features, platforms, and value.

What Slo Offers

Slo is an ambient sound app designed for sleep, focus, and relaxation. The app provides a curated library of 70+ sounds including brown noise, white noise, pink noise, nature recordings, and atmospheric audio. Users can layer multiple sounds simultaneously using the built-in mixer with individual volume controls.

Slo is available natively on iOS, Android, and macOS. The app includes a sleep timer for automatic fade-out and presents a minimal interface focused on sound selection and mixing. A free tier provides access to select sounds, with a premium subscription unlocking the full library.

Slo’s Android app is the same product as its iOS version, providing feature parity across both mobile platforms. The macOS app brings the same experience to the desktop.

What Noizio Offers

Noizio is a minimalist ambient sound mixer that started as a macOS app before expanding to iOS. The app provides a library of approximately 40+ sounds including noise types, nature recordings, and urban environments. Sounds can be layered and mixed with individual volume control, similar to Slo’s mixer approach.

Noizio’s distinguishing feature for Apple ecosystem users is iCloud sync. Mix presets created on one device synchronize across iPhone, iPad, and Mac automatically. This allows users to set up a mix on their phone and have it available on their desktop without manual recreation.

The macOS version of Noizio sits in the menu bar, providing quick access to sound controls without a full application window. This menu-bar approach is designed for users who want ambient sound running in the background without occupying screen space.

Noizio offers 5 sounds free on iOS, with the full library available as a one-time purchase at $2.99. The macOS app is a separate purchase. The Android version exists as a separate app with its own development cycle and may not have full feature parity with the iOS version.

Noizio does not include a sleep timer in the same integrated manner as Slo. The app focuses purely on sound mixing without additional scheduling or timer features.

Key Differences

Library Size

Slo offers 70+ sounds, providing a larger selection across more categories. Noizio offers approximately 40+ sounds. Users who want more variety and the ability to discover new sound combinations will find more options in Slo. Users who prefer a compact, focused selection may find Noizio’s library sufficient.

iCloud Sync

Noizio syncs mix presets across Apple devices via iCloud. Users who create a favorite mix on iPhone can access it automatically on Mac. Slo does not currently offer cross-device sync for mix presets. For users deeply embedded in the Apple ecosystem who switch between devices frequently, this is a meaningful differentiator.

Android Support

Slo offers a full-featured Android app with parity to the iOS version. Noizio’s Android situation is less straightforward; it exists as a separate version that may differ in features or update cadence from the iOS app. Users who primarily use Android would find more consistent support in Slo.

Desktop Experience

Both apps offer native macOS applications. Noizio’s Mac app lives in the menu bar, providing lightweight access without a full window. Slo’s Mac app offers a standard application window. The menu-bar approach may suit users who want ambient sound as a minimal background utility; the standard window may suit users who want a more visual, browsable experience.

Pricing Model

Noizio uses a one-time purchase model at $2.99 for the iOS full library unlock, making it one of the most affordable ambient sound apps available. The macOS app is a separate purchase. Slo offers a free tier with select sounds and a premium subscription for full access. Users who prefer paying once with no recurring fees will find that in Noizio. Users who want to try a larger library before committing may prefer Slo’s free tier approach.

Timer Features

Slo includes a built-in sleep timer that fades audio out after a set duration, designed for users who listen while falling asleep. Noizio focuses on continuous playback for ambient background sound. Users who specifically want timed sessions for sleep will find that feature more developed in Slo.

Platform Consistency

Slo maintains a consistent experience across iOS, Android, and Mac. Noizio’s experience is most cohesive within the Apple ecosystem (iOS and Mac with iCloud sync), with the Android version existing somewhat separately. Users who use both iOS and Mac will find Noizio’s ecosystem integration appealing. Users who use Android or mix platforms will find more consistency in Slo.

Which App Is Right for You?

If you want a larger sound library, consistent cross-platform support including Android, a built-in sleep timer, and a free tier to explore before paying, Slo provides that broader experience. The 70+ sound library and platform parity make it suitable for users on any device.

If you are primarily in the Apple ecosystem, value iCloud sync for mix presets across iPhone and Mac, prefer a lightweight menu-bar app on desktop, and want an extremely low one-time price, Noizio provides that focused Apple-first experience. The $2.99 price point makes it one of the most affordable options in the category.

Both apps share a minimalist design philosophy and sound mixing capabilities. The choice often comes down to ecosystem preference, library size needs, and whether you value iCloud sync or broader platform support. For guidance on building effective mixes, see our guide on how to create the perfect sleep soundscape.

Information based on publicly available data as of April 2026. Visit the official Noizio and Slo app store listings for the most current details.

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