AI Mastering

AI Mastering is an online service that uses AI to improve music sound quality. Its limiter can balance loudness and dynamic range, while users can set target loudness and mastering level. The web interface supports drag-and-drop uploads, output-format customization, spectrum analysis, and loudness analysis. Its API handles audio uploads and downloads, mastering, and changes to mastering settings; the documentation links JavaScript (Node) and Ruby client libraries and tutorials. An offline desktop version is also available, and the maker says its focus is shifting toward that version rather than the API. Offline file size depends on the computer’s memory. The online service has file limits, and its maker says waiting time cannot be shortened, suggesting the offline version to reduce it. A bass-preservation setting can reduce low-frequency attenuation. The free plan lists unlimited mastering, and supported input formats are WAV, MP3, and MP4, with WAV export available. The maker says users retain control over mastered tracks without service restrictions.

AI Mastering offers adjustable online mastering alongside an offline desktop version and an API. The online service has file limits and waiting time, while offline capacity depends on the computer’s memory.

AI Mastering suits musicians who want an online way to adjust loudness and mastering level, or users who prefer an offline desktop version. API access may suit developers working with its linked Node or Ruby client libraries.

Overview

AI Mastering is aimed at musicians and audio makers who want a configurable mastering workflow without paying for the online plan. Its strongest case is the combination of adjustable loudness controls, analysis tools and a desktop option for avoiding the online queue. It is less compelling when quick online turnaround is essential.

Automatic mastering is intended to move music toward commercial sound quality, with a limiter balancing loudness and dynamic range. The web interface accepts WAV, MP3 and MP4 files and supports reference-track matching, WAV export and loudness targets. Those controls make it more useful than a hands-off one-click service for users who want to shape the output, though they do not remove the online waiting time.

Key features

Drag-and-drop input, target loudness and mastering-level adjustments, and output-format customization cover the central decisions in a mastering pass. Spectrum and loudness analysis give users ways to inspect the track alongside those adjustments. The bass preservation option can reduce low-frequency attenuation, a useful control when retaining bass weight matters.

AI Mastering says output frequencies up to 24 kHz are possible when the source sample rate is at least 48 kHz and the same rate is selected in custom settings. This depends on the source and configuration, so it is not a blanket guarantee for every file.

The API supports audio upload and download, mastering, and changes to target loudness and mastering level. Documentation links JavaScript (Node) and Ruby client libraries and tutorials. That is a practical starting point for developers automating a workflow, but the maker says its focus is shifting toward the offline desktop version rather than the API.

The offline version avoids the online service's file limitations; its maximum file size depends on the computer's memory. By contrast, the online waiting time cannot be shortened. The desktop version is therefore the more fitting route for users with large files or little patience for a queue, provided their computer has sufficient memory.

The maker says users retain full control over mastered tracks without service restrictions. Its privacy policy says personal information is not provided to third parties without prior consent except in specified cases, including legal requirements. Support is offered by email and telephone; the service provider is Bakuage Co., Ltd.

Pricing

The Free Plan costs nothing, billed $0 / Month, and includes Unlimited Mastering. There is no paid tier to weigh against the free option in the plan information presented here, so it suits users who want ongoing mastering without a subscription charge. Its meaningful tradeoff is operational rather than a stated quota: online users must accept the wait, while offline file capacity rests on computer memory.

For occasional users, the unlimited free plan removes the need to ration mastering runs. Developers may also use the free plan, though the API's future emphasis is less certain as the maker shifts focus toward desktop software. Those needing dependable immediate online processing should look elsewhere rather than assume the free plan offers faster turnaround.

Platforms

AI Mastering lists Android, iOS, Linux, macOS, Windows, web, API, extension and self-hosted platforms. The web service provides the described drag-and-drop workflow, while the offline desktop version runs with file capacity tied to the computer's memory. API documentation includes Node and Ruby clients. These options give users several ways to access the service, but the stated feature details center on web, desktop and API use.

Who it's for

AI Mastering fits independent musicians, producers and audio makers seeking free mastering with adjustable loudness, analysis and WAV export. It is especially suitable for users who can tolerate online processing delays or prefer offline work with a computer capable of handling their files. Teams or developers whose workflow depends on continued API investment may want to compare alternatives before building around it.

Pros and cons

• Pros: Unlimited Mastering on the free plan makes repeated use possible without a listed monthly charge.
• Pros: Loudness and mastering-level controls, spectrum and loudness analysis, and reference-track matching offer more direction than automatic processing alone.
• Pros: The offline version has no matching online file limit; the ceiling instead depends on computer memory.
• Cons: Online waiting time cannot be shortened, making it a poor fit for deadline-driven work that must stay online.
• Cons: API users should account for the maker's stated shift in focus toward the offline desktop version.
• Cons: Offline file capacity varies with the computer, so users handling large tracks need enough memory.

Alternatives

AI Music Mastering Software is a useful place to compare more options in the category.

Choose SoundBoost.ai if Android or iOS access matters and a defined annual unlimited plan is preferable; its free plan allows 10 revisions per project but no finalizing or downloads.

TrackGleam offers unlimited free mastering with WAV and MP3 output and no watermark or sign-up, making it worth considering when those terms are the priority.

MasteringBOX is another freemium option for web and Android.

Auralith Forge may suit users who prefer a limited number of full-length masters and one-time payment options, rather than an unlimited free plan.

SongUp AI is a web alternative if the priority is generating songs, with its free plan offering three instant songs for personal use.

Barichord Audio Lab may appeal to users who want manual EQ and effects tools and before-and-after comparison in a browser-based playground.

HanoLab Mastering is worth comparing for an API-and-web workflow with monthly credits, Studio-track limits and MP3 export on its free plan.

MasterForge is another freemium web option.

Verdict

AI Mastering is a strong fit for musicians who want free, repeatable mastering with meaningful loudness controls and can work around online waits or use the offline desktop version. Choose it for flexible access and a no-cost unlimited plan; look elsewhere if fast online processing is essential or your work depends on a long-term API-focused roadmap.