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Master music with souliOS, iPadOS & macOS

ReSoul

Professional control without losing the feeling.

Turn rough mixes and AI-generated tracks into clear, controlled, release-ready masters with a tactile mastering deck built for musicians.

See what it does Get support

ReSoul live mastering deck in Rainbow Spectrum mode — Inside ReSoulReSoul’s mastering deck, with live spectrum and stereo metering.

Original photography · Solution 7 Media

5Decision-ready meters

4Independent color modes

LocalAudio stays on device

A tactile mastering deck for music that still needs to feel human

Hear the problem. Shape the answer. Keep the soul.

ReSoul combines corrective EQ, stereo control, dynamics, harmonic character, true-peak protection, and loudness metering in one responsive deck. Every color mode changes the room—not the sound.

Load and listen

Open a stereo track and see separate channels, live spectrum, level, loudness, peak, and phase evidence.

Shape with intent

Start with Easy Fix or a musical preset, then control bass, mud, body, harshness, width, punch, warmth, and air.

Audition the truth

Match level, switch Before and After, protect true peak, and export a polished stereo WAV.

Real product. Current interface.

See ReSoul at work.

ReSoul Rainbow Spectrum mastering workspace on macOS — macOS Mastering Deck

ReSoul Aurora Prism color mode on iPhone — Aurora Prism

ReSoul Rainbow Spectrum color mode on iPhone — Rainbow Spectrum

ReSoul High Contrast color mode on iPhone — High Contrast

Built around the real workflow

Tools that earn their place.

Turn rough mixes and AI-generated tracks into clear, controlled, release-ready masters with a tactile mastering deck built for musicians.

See both channels

Separate left and right waveforms, a live spectrum, and a six-band equalizer keep the stereo picture visible.

Meter what matters

Read LUFS, RMS, true peak, correlation, and limiter gain reduction while you make decisions.

Difficult sources welcome

Work on dense mixes, compressed AI music, harsh guitars, phasey stereo, metallic highs, and uneven low end.

Audition with confidence

Use Before/After, one-click Easy Fix, musical starting points, streaming targets, and true-peak protection before WAV export.

Apple distribution

Internal TestFlight beta — no public listing

ReSoul is currently in internal TestFlight beta.

Listing pending

The craft behind the master

Your music stays yours at every stage.

01PrivacyHow ReSoul handles your work and data 02SupportHelp for the next master 03TermsStraightforward terms for your creative work

Privacy PolicyEffective July 13, 2026

Overview

ReSoul is designed as an on-device mastering tool. The app does not require an account and does not use your music for advertising or model training.

Data collection

ReSoul does not collect personal data. It does not include advertising SDKs, cross-app tracking, analytics profiles, or a ReSoul cloud account.

Your audio

Audio files are opened only after you select them. Analysis, playback, mastering, metering, and export occur locally on your device. ReSoul does not upload audio to a ReSoul server.

Files and settings

The app may store local preferences, mastering presets, theme selection, and security-scoped file bookmarks needed to reopen files you selected. You control exported masters and their destination.

Required-reason APIs

ReSoul uses system uptime for accurate audio timing and file timestamps for user-selected files and app-container file management. These APIs are not used for tracking or fingerprinting.

Third parties

ReSoul does not sell or share personal information. Operating-system services and storage providers you choose remain governed by their own privacy terms.

Children

Because ReSoul does not collect personal data or require an account, it does not knowingly collect information from children.

Changes

If ReSoul's data practices change, this policy and the App Store privacy disclosure will be updated before the changed behavior is released.

Questions

For privacy questions during beta testing, use Send Beta Feedback on ReSoul's TestFlight page. A permanent public support contact will be added before production release.

SupportHelp for the next master

Overview

A clean path from rough mix to finished master.

ReSoul includes a full in-app guide. These essentials will get a new session moving quickly.

Recommended workflow

Add Music File and choose a stereo WAV, AIFF, FLAC, MP3, or M4A.
Confirm the separate Left and Right waveform lanes.
Choose Easy Fix or a mastering preset as a musical starting point.
Press Play and alternate Before and After.
Watch LUFS, RMS, true peak, correlation, and limiter reduction while adjusting.
Use Match Level when appropriate, then Export Master.

No sound?

Check the selected output device, system volume, and the Before/After state. On iPhone or iPad, reconnect headphones or the audio interface and press Play again after a route change.

File will not open?

Confirm the file is a supported audio format and is stored locally or fully downloaded from its cloud provider. Protected streaming-library files cannot be mastered.

Master sounds too aggressive?

Toggle Before/After, lower Output Drive, reduce harmonic character controls, and keep the true-peak limiter enabled. Preserve dynamics instead of chasing loudness alone.

Understanding the target

Streaming Universal starts at -14 LUFS with a -1.0 dBTP ceiling. This is a safe delivery reference, not a rule every artistic master must hit exactly.

Beta feedback

During TestFlight testing, open the TestFlight app, select ReSoul, and choose Send Beta Feedback. Include the source format, device model, OS version, and what you heard or expected.

Version

ReSoul Support · Version 1.3

End User License AgreementStraightforward terms for your creative work

ReSoul is offered under Apple’s Standard License Agreement.

Read Apple’s Standard EULA