Slo vs Noisli: Ambient Sound Apps Compared (2026)

Overview

Slo and Noisli are both ambient sound apps that include sound mixing capabilities, but they serve different primary audiences. Slo is focused on sleep and relaxation with a large sound library and cross-platform availability. Noisli is productivity-oriented, combining ambient sounds with a built-in text editor and Pomodoro timer. This comparison examines the features, platforms, and pricing of both apps.

What Slo Offers

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

Slo is available on iOS, Android, and macOS, covering both mobile platforms and the desktop. The app includes a sleep timer for automatic fade-out and uses 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.

The app does not include productivity tools, text editing, or work-session timers. Its scope is limited to ambient sound generation and customization.

What Noisli Offers

Noisli is an ambient sound app originally launched as a web application, designed primarily for productivity and focus. The app provides 15+ carefully selected sounds including noise types, nature, and environment recordings. Like Slo, Noisli includes a mixer for combining sounds at different volume levels.

What distinguishes Noisli is its built-in productivity features: a distraction-free text editor for writing and a Pomodoro timer for structured work sessions. These tools are integrated alongside the sound player, positioning Noisli as a work-focused ambient sound environment.

Noisli is available as a web application and an iOS app. The Android app was discontinued in 2023. The web version offers free access with limitations, while the iOS app is available as a one-time purchase at $1.99. Noisli does not offer a native macOS desktop app or an Android app.

The sound library is intentionally compact at 15+ sounds. Noisli’s approach prioritizes a small set of well-recorded sounds over library size, keeping the interface simple and focused.

Key Differences

Primary Use Case

Slo is designed for sleep and relaxation, with sounds selected for their calming qualities and a library that includes a wide range of ambient and nature recordings. Noisli is designed for productivity and focus, pairing ambient sounds with work tools like a text editor and Pomodoro timer. While both apps can be used for either purpose, their feature sets reflect these different priorities. For more on choosing sounds for focus, see our guide on the best sounds for focus and productivity.

Sound Library Size

Slo offers 70+ sounds spanning multiple categories including various noise colors. Noisli offers 15+ carefully curated sounds. Users who want variety and the ability to discover new combinations would find more options in Slo. Users who prefer a minimal set of well-chosen sounds would find Noisli’s approach sufficient.

Productivity Tools

Noisli includes a built-in distraction-free text editor where users can write while listening to ambient sounds. It also includes a Pomodoro timer for structured work intervals. Slo does not include any productivity or writing tools; it is exclusively a sound app.

Platform Availability

Slo is available on iOS, Android, and macOS. Noisli is available on iOS and the web. Noisli discontinued its Android app in 2023, leaving Android users without access. Users who need an Android app or a native macOS app would find those in Slo. Users who prefer a browser-based experience would find that in Noisli’s web app.

Pricing Model

Noisli’s iOS app uses a one-time purchase model at $1.99, which is uncommon in the app category. The web version offers limited free access. Slo provides a free tier with select sounds and a premium subscription for the full library. The pricing models reflect different business approaches: one-time payment versus subscription.

Interface Philosophy

Both apps use clean, minimal interfaces. Noisli uses color-coded tiles for each sound type, creating a visual representation of the sound mix. Slo uses a dedicated mixer view with individual volume sliders. Both prioritize simplicity, though they express it differently.

Which App Is Right for You?

If you are looking for an ambient sound app with a large library, cross-platform availability including Android and Mac, and features designed for sleep and relaxation, Slo provides that experience. The 70+ sound library and dedicated mixer make it suitable for creating varied soundscapes.

If you are looking for a productivity-focused ambient sound tool with a built-in text editor and Pomodoro timer, and you primarily use iOS or a web browser, Noisli provides that integrated work environment. The one-time purchase pricing and compact sound selection appeal to users who prefer simplicity and no recurring fees.

The choice between Slo and Noisli often comes down to use case: sleep and relaxation versus work and productivity, and platform needs: Android and Mac availability versus web-based access.

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

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