Comparison

slowandreverb vs SonicLab slowed and reverb generator

Slowandreverb vs SonicLab compared feature by feature: speed range, reverb and decay controls, pitch shift, presets, export formats, batch processing and privacy.

SonicLab's slowed and reverb generator is one of the closer comparisons to this site. Both are free browser tools, both say they process audio locally, and both aim at the same job. The differences are in the details: which controls each gives you, what each exports, and how each handles more than one song. This page puts them side by side using what SonicLab's own page states at the time of writing, with no guesses filled in.

Our tool is the slowed reverb generator that runs on this site. If you want to see how we compare with other browser tools, the best slowed reverb makers list covers the field, and the LuminaAudio comparison looks at another in-browser generator with a different feature set.

Feature table

Where SonicLab is ahead

WAV export. SonicLab offers a WAV download alongside MP3. We export MP3 only, at 96 kbps and 32 kHz. If you need a lossless file from a browser tool, SonicLab gives you one and we do not. Our rate is chosen so the encode finishes fast in a tab, including on phones, and it is fine for YouTube, TikTok and Shorts because those platforms re-encode. It is not a master. For a true master we point people to a WAV source and a DAW.

Independent pitch shift. SonicLab lists a pitch shift of up to six semitones in either direction. On this site, pitch is tied to speed unless you turn Preserve pitch on, which holds the original key in the live preview only; exported files keep the speed-linked pitch. There is no slider that moves pitch on its own. If your edit needs the song two semitones down at the original tempo, SonicLab has a control for it and we do not. Our lower pitch of song page explains how far speed alone takes you: 0.84x is roughly three semitones down.

Five style presets. Classic, Dreamy, Lo-fi, Vapor and Subtle give a new user more named starting points than our four.

Where slowandreverb is ahead

Reverb decay. We separate the wet mix from the decay time. The Space slider runs from 1.2 to 6.0 seconds, so you can have a quiet, long tail or a loud, short one. SonicLab's page describes a single reverb depth from dry to fully wet and does not mention a decay control.

Tone and width. We have a high shelf from -10 to +10 dB for darkening or brightening, and a stereo width control from mono to 1.5. SonicLab's page does not list either.

Batch processing. This is the biggest practical difference. Add an album here, click Select All Tracks, set the sliders once, and Download All gives you a ZIP. You can also select subsets for different settings. SonicLab's page does not mention processing more than one file at a time. For channel work, see bulk slowed reverb.

Custom presets. Once you like a sound, Create preset saves it in your browser next to the built-ins. SonicLab's page lists fixed presets only.

No file size cap. SonicLab states a 500 MB limit. We do not impose one; the practical limit is your device's memory.

Matching a SonicLab preset here

SonicLab does not publish the values behind its presets, so there is no exact mapping. These are our own starting points for the moods those names suggest. Adjust by ear.

Pitch: two different philosophies

SonicLab bolts a pitch shifter onto the speed change. That is flexible, but it means two separate processes act on the signal, and time-stretch plus pitch-shift can add artifacts on dense material.

We keep it simple. Speed changes pitch the way a turntable does, and Preserve pitch holds the key with a single time-stretch. For the classic slowed and reverb sound, the linked pitch drop is the point; it is what makes a voice sit lower and heavier. For practice tracks or dance edits, Preserve pitch keeps the key while you listen; it changes the live preview only, and exported files keep the speed-linked pitch. What we do not offer is a third option, "same tempo, new key". That is a real gap, and SonicLab fills it.

Privacy

Both tools say processing happens in the browser and files are never uploaded. SonicLab's page states it in its own words and we state ours. In our case you can load the page, disconnect from the internet, and the editor keeps working, which is a quick way to check the claim yourself. We cannot test SonicLab's internals from its page, so we take its statement at face value and note that it is a claim.

Who should use which

Pick SonicLab if you need a WAV from a browser tool, or an independent pitch shift, or you like its preset names. Pick this site if you process more than one song at a time, want separate control over reverb decay, tone and width, want to save your own presets, or have files above 500 MB. Many people keep both open. There is no account on either side, so switching costs nothing.

Open the free editor: upload MP3, WAV, AAC, OGG or FLAC, adjust speed, reverb, bass, tone, width and space, then export MP3 or a ZIP of many tracks. Everything runs in your browser.