No account, no cloud, no upload. PSLM turns a rough mix into a finished master entirely offline on your Mac, and tells you what it fixed on the way.
Free beta, runs to 31 Dec 2026 · Version 0.1.7 · macOS 10.13 or newer · Apple Silicon and Intel · signed and notarized
Also on iPhone
Hear the difference
Both versions sit at the same loudness, so nothing here wins by being louder. Switch while it plays.
A real trapsoul record, not a demo loop. Watch the peak ceiling drop when you switch: same average level, about six decibels more room under the transients. The same A/B lives inside the app, level-matched at the file's native sample rate.
How it works
01
WAV, AIFF or MP3. Nothing uploads, and there is no account to make first.
02
PSLM reads the track and sets the chain. Pick a loudness tier or let Smart decide for you.
03
Print a loud, clean, release-ready file, verified by Master Check before it lands on your drive.
PSLM Listen
Boom, harshness, mud, phase. Listen reads the track, says what it found and why it matters, then sets the chain for you. You can take the suggestion or overrule it.
Your target is louder than this track's clean ceiling of −9 LUFS. Expect the 808 to pump. Ease the loudness, or apply the recommended fixes first.
Loud, but clean
A clip-before-limit engine, band-split and sub-protected and oversampled, gets the record as loud as modern streaming asks for without the harsh, crunchy artifacts that usually come with it. True-peak safe at −1.0 dBTP, never hard-clipped.
Low
−14 LUFS
Mid
−11 LUFS
High
−9 LUFS
Smart
automatic
Smart Bass Limiter tames only the 808 that's clipping, so the low end stays huge without pumping the mix.
Master Check
After the render, PSLM verifies true peak, loudness, clipping, phase, dynamics, and whether the master introduced any mud or harshness that wasn't in your source. The safe problems it fixes on its own.
New in 0.1.2: auto de-harsh. If a loud master brings up harsh vocal highs, PSLM measures it and tames it gently. Masters that are already clean and bright are left alone.
Nine gates, every time. Here it caught 2.5 dB of sibilance the loud chain added, and flagged it rather than letting it through.
Export
WAV 24-bit for lossless delivery, WAV 16-bit dithered for CD, MP3 320, AAC 320 and FLAC. Album mastering batches a whole project with coherent loudness across every track.
Every export comes with its numbers: integrated loudness, true peak, loudness range and a mono-safety check.
Private by design
Everything runs locally.
No uploads, no accounts, no listening in.
Works with the wifi off.
Cloud mastering services need your file on their servers to work at all. PSLM doesn't, which is why there is no sign-up between you and your song. Read the privacy policy.
Platforms
macOS
Available now — v0.1.7
Universal build for Apple Silicon and Intel. Runs on macOS 10.13 High Sierra and newer. Signed and Apple-notarized, so it opens without a security warning. Updates itself.
Download for MaciOS
Available now — v0.1.4
Free on the App Store for iPhone, in the US. Same engine, same local processing, nothing uploaded.
Get it on the App StoreAndroid
In development
An Android build is being worked on. No date yet, and it won't be announced until it's ready to install.
In developmentWhere this is at
PSLM is a public beta and it's free to download and use, with nothing held back and no watermark on your exports.
Right now
The whole app. Every feature, every export format. The beta runs until 31 December 2026.
At 1.0
$79 for the first 500, $99 after
A perpetual licence covering two machines. Everyone who runs the beta gets founder pricing, so getting in now is the cheapest this will ever be.
One email when 1.0 lands. Unsubscribe anytime.
Questions
There isn't one. PSLM is a public beta, so it's free while the rough edges are found with real users on real records. Nothing is held back and there's no watermark. The beta does run to a date though — 31 December 2026. After that, mastering and export switch off until you move to the current version; nothing you've already made is affected. At 1.0 it becomes a paid app at $79 for the first 500 licences, and anyone who ran the beta keeps that founder price.
No. Analysis, mastering and export all happen on your machine. There is no account, no server and nothing listening in. It works with the network switched off.
A Mac running macOS 10.13 High Sierra or newer. The build is universal, so it runs natively on both Apple Silicon and Intel machines.
No. PSLM is signed with an Apple Developer ID and notarized by Apple, so it opens normally without a security warning or a right-click workaround.
They're built in. PSLM checks for new versions and updates itself, so you only ever need to download it once.
WAV 24-bit lossless, WAV 16-bit dithered for CD, MP3 320, AAC 320 and FLAC.
Four tiers: Low at −14 LUFS, Mid at −11, High at −9, or Smart which picks for you based on the track. Everything stays true-peak safe at −1.0 dBTP and is never hard-clipped.
Yes. PSLM is free on the App Store for iPhone, in the US for now. Android is in development.
It works on any music. The voicing is tuned around 808-heavy, vocal-forward mixes because that's what it was built for, and Sonic Profile lets you point it at a reference from any genre.
Free while it's in beta. No account, no upload, no waiting on anyone.
Download for MacFree public beta · Version 0.1.7 · macOS 10.13+ · Universal