Slo vs myNoise: Sound Generator Apps Compared (2026)

Overview

Slo and myNoise are both ambient sound apps, but they approach sound generation from fundamentally different angles. myNoise is created by audio research engineer Dr. Stephane Pigeon and is built around scientific calibration, per-frequency sliders, and an enormous library of community-generated soundscapes. Slo focuses on simplicity, curation, and cross-platform availability. For background on how different noise types work, see our guide on the science behind brown noise. This comparison examines the features, customization depth, 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 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 clean, minimal interface focused on quick sound selection and mixing. A free tier provides access to select sounds, with a premium subscription unlocking the full library.

The app prioritizes ease of use over deep customization. Users can select sounds, adjust volumes, combine layers, and start listening within seconds. There is no per-frequency equalization or animation system; the design philosophy centers on curation rather than granular control.

What myNoise Offers

myNoise was founded by Dr. Stephane Pigeon, a signal processing engineer with a background in audio research. The project began as a web application and has grown into one of the largest collections of sound generators available, with over 300 generators covering noise types, nature, industrial environments, tonal drones, binaural beats, and abstract soundscapes.

The defining feature of myNoise is its per-frequency slider system. Each sound generator presents 10 frequency-band sliders, allowing users to sculpt the spectral content of any sound. This means a single brown noise generator can be tuned to emphasize low rumble, remove high frequencies, or create custom spectral profiles. The system supports calibration to the user’s hearing curve.

myNoise also includes an animation mode that automatically moves the frequency sliders over time, creating evolving soundscapes that change continuously. The “Super Generator” feature allows combining multiple generators into layered compositions with individual slider control for each layer.

The web application is free to use without an account. The iOS and Android apps are available as a one-time purchase at $19.99, which includes access to all generators. There is no subscription model. The project is funded through donations and the one-time app purchase.

myNoise does not offer a native macOS desktop app. The web version works in desktop browsers but requires an internet connection. The mobile apps work offline once sounds are downloaded.

Key Differences

Sound Customization Depth

The most significant difference between these apps is customization depth. myNoise provides per-frequency equalization on every sound, allowing precise spectral shaping. Users can remove specific frequency ranges, boost others, and create profiles that differ dramatically from the source recording. Slo provides volume-based mixing of curated sounds without per-frequency control. This represents a fundamental design tradeoff: deep customization versus curated simplicity.

Library Size and Source

myNoise offers over 300 sound generators, many contributed by the community and curated by Dr. Pigeon. The library spans categories from realistic nature recordings to abstract synthesized tones, binaural beats, and experimental soundscapes. Slo offers 70+ curated sounds focused on sleep and relaxation categories. Users who want an extensive, varied library will find more in myNoise. Users who prefer a focused, curated selection may prefer Slo’s approach.

Scientific Calibration

myNoise includes a hearing calibration feature that adjusts sound output to the user’s specific hearing curve. This is rooted in Dr. Pigeon’s background in audio engineering and signal processing. Slo does not include hearing calibration or scientific measurement tools.

Animation and Evolution

myNoise’s animate mode moves frequency sliders automatically over time, creating soundscapes that evolve continuously rather than looping. This prevents auditory habituation and keeps the sound environment fresh. Slo provides static mixes where the sound remains consistent once set. Users who want constantly evolving audio would find that feature exclusively in myNoise.

Platform Availability

Slo is available natively on iOS, Android, and macOS. myNoise is available as a web application and on iOS and Android, but does not offer a native macOS app. Users who want a dedicated desktop app would find that in Slo. Users who prefer browser-based access would find that in myNoise’s web app.

Pricing Model

myNoise uses a one-time purchase model for its mobile apps at $19.99, with the web version free to use. There is no subscription. Slo provides a free tier with select sounds and a premium subscription for full library access. The pricing philosophies differ: myNoise charges once for everything, while Slo offers free access with optional ongoing premium features.

Interface Approach

Slo presents a minimal interface designed for quick interaction: select sounds, adjust volumes, play. myNoise presents a more technical interface with sliders, calibration options, and generator settings. The myNoise interface rewards exploration and experimentation; the Slo interface rewards speed and simplicity.

Which App Is Right for You?

If you want deep sound customization with per-frequency control, a massive library of 300+ generators, animation features, and are comfortable with a more technical interface, myNoise provides an unmatched level of audio control. The one-time purchase and lack of subscription make it cost-effective for long-term use.

If you want a curated, minimal ambient sound app with native macOS support, a clean mobile experience across iOS and Android, and prefer selecting from pre-designed sounds rather than sculpting frequencies, Slo provides that streamlined experience. The free tier allows trying the app without commitment.

The choice often comes down to how much control you want over your soundscape. myNoise is for users who enjoy tweaking and customizing audio at a granular level. Slo is for users who want quality ambient sound with minimal setup. For a broader overview of mixing approaches, see our guide on how to use sound mixing.

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

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