Tunr

Tunr is a desktop mastering app for DJs and producers who want to process tracks locally and compare them against a reference. Its controlled listening tools and no-cost unlimited licence make it worth considering; the separate-app workflow is a real drawback if mastering needs to happen inside a DAW.

Overview

Tunr analyzes tracks and creates genre-aware masters on the computer, so mastering itself works offline. Auto mode applies a mastering chain, while Reference mode targets a chosen track’s tone, dynamics, and loudness. That gives users a quick route and a reference-led one, though neither makes Tunr a replacement for a DAW: it runs as a standalone app, not a plugin.

The maker says Tunr grew out of a DJ and electronic-music producer’s effort to simplify his own mastering workflow. That focus is relevant to producers seeking a repeatable mastering step, but it does not establish that the app will suit every genre or production approach.

Key features

Reference matching and comparison

Reference mode accepts WAV, FLAC, and MP3. The A/B Mixer adds equal-power crossfade, null and blind tests, loudness matching, and stereo, mono, mid, or side listening. These controls make it easier to compare differences deliberately rather than relying on an unlevelled toggle. Analysis and comparison do not use up the free render allowance, so users can explore that part of the workflow without spending one of their three masters.

Batch processing and output

Batch mode processes queued tracks sequentially with the same settings and saves each as it finishes. That is useful when preparing several tracks consistently, though it is not a simultaneous render. Tunr supports loudness targets and WAV export; its free tier limits output to 16-bit, while the plan details also show a 24-bit output option without specifying which licence includes it.

Local processing and privacy

Mastering does not require a connection, and the maker says audio files are not uploaded, with no usage telemetry or third-party trackers. Tunr does make network requests for GitLab updates and licence activation and periodic revocation checks, described as roughly monthly. Paddle handles billing as Merchant of Record; the maker says it does not see or store card numbers or CVV. The app includes open-source components such as Matchering, Pedalboard, pyloudnorm, and FFmpeg.

Pricing

Tunr has two free options, both shown at no cost. The initial Free plan provides a key by email and permits three masters per machine before a licence key is needed. It is a useful way to try rendering, while unlimited A/B comparison and analysis let users assess the listening workflow without using those renders.

The Free licence key is also free, with unlimited masters, two machines per licence, and free lifetime updates. For ongoing use, it removes the central render cap at no cost; the two-machine allowance is the main constraint for users working across a larger set of computers. The plan terms do not state a 24-bit entitlement, so buyers should not assume it from the output option alone.

Platforms

Tunr is a desktop app for macOS 11 or later on Apple Silicon or Intel, and 64-bit Windows 10 or later. It is not a DAW plugin, so users must treat mastering as a separate step rather than operating it directly in a DAW session.

Who it's for

Tunr suits DJs and independent producers who want offline mastering, reference matching, and controlled A/B checks without paying for an unlimited render licence. Batch processing also makes it a sensible fit for preparing a queue of tracks with consistent settings. It is less suitable for people who need plugin integration or more than two licensed machines.

Pros and cons

• Pros: Local, offline mastering keeps audio on the user’s computer, according to the maker.
• Pros: Reference matching and detailed A/B listening support more disciplined comparisons, and comparison does not count toward the free render cap.
• Pros: The free licence key removes the render limit and includes lifetime updates.
• Cons: The initial no-key allowance is only three masters per machine.
• Cons: Tunr is standalone rather than a DAW plugin, interrupting workflows built around in-session processing.
• Cons: The free licence key covers two machines per licence.

Alternatives

Matchering is a free, open-source option for users who want software available across Linux, macOS, Windows, web, and self-hosted setups rather than Tunr’s specified desktop workflow. StudioZIO Mastering Suite is worth considering for macOS users who want AU, VST3, or AAX plugins as well as standalone operation, with no licence key or account required.

Voxengo SPAN is a free real-time FFT spectrum analyzer plugin, a better fit for users seeking analysis inside a plugin workflow rather than Tunr’s mastering modes. IK Multimedia ReSing focuses on voices and instruments, with a free tier and a 129.99 USD one-time paid plan, so choose it for that scope rather than mastering.

TDR Limiter 6 GE offers a one-user licence for up to five computers at 60.00 EUR one time, making it an option for those seeking a paid limiter instead. DSP-Quattro is a macOS freemium app with a free trial. Acustica Audio Erin Studio is a paid option for macOS and Windows. FabFilter Pro-L 2 is a paid option with a free trial for iOS, macOS, and Windows.

Browse Audio Mastering Software or AI Music Mastering Software for more options.

Verdict

Choose Tunr if you want local, offline mastering with reference matching, useful comparison controls, and unlimited rendering without a licence fee. Its clearest limitation is the standalone workflow; look elsewhere if you need mastering inside a DAW or a licence covering more than two machines.