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AI Mastering

aimastering.com

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Spec score 9.1 #1 of 50 in AI mastering tools

What it is

AI Mastering is an online service that uses AI to master audio with the aim of improving music sound quality. Its limiter can balance loudness and dynamic range, while the web interface lets users set target loudness and mastering level. It also supports drag-and-drop uploads, output-format customization, spectrum analysis, and loudness analysis. The API supports audio upload and download, mastering, and changes to target loudness and mastering level; its documentation links JavaScript (Node) and Ruby client libraries and tutorials. An offline desktop version is 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, while the online service has file limits. The maker says online waiting time cannot be shortened and suggests using the offline version to reduce it. A bass-preservation option can reduce low-frequency attenuation. Supported input formats are WAV, MP3, and MP4, and WAV export is available. The free plan lists unlimited mastering, and users retain control over their mastered tracks without service restrictions.

Spec sheet

What it does
AI Mastering is an online service that automatically improves music and balances loudness and dynamic range.Read 15 Oct 2026 · aimastering.com
API
The API supports audio upload and download, mastering, and changes to target loudness and mastering level.Read 2 Oct 2026 · aimastering.com
Privacy
The privacy policy says personal information is not provided to third parties without prior consent except in specified cases, including legal requirements.Read 2 Oct 2026 · aimastering.com
Support
The site lists email and telephone contact options, and the privacy policy directs policy inquiries to the email contact listed under Service Provider.Read 2 Oct 2026 · aimastering.com
Maker
The service provider is Bakuage Co., Ltd.Read 2 Oct 2026 · aimastering.com
API clients
The API documentation links JavaScript (Node) and Ruby client libraries and tutorials.Read 2 Oct 2026 · aimastering.com
API functions
The API supports audio upload and download, mastering, target-loudness changes and mastering-level changes.Read 15 Oct 2026 · aimastering.com
API specification
The API is described with the OpenAPI specification and linked through SwaggerHub and a raw specification.Read 15 Oct 2026 · aimastering.com
Automatic mastering
The service says AI brings music sound quality closer to commercial music.Read 2 Oct 2026 · aimastering.com
Bass setting
A bass preservation option can reduce low-frequency attenuation.Read 2 Oct 2026 · aimastering.com
CLI authentication
The CLI generates a separate guest API key for each command and requires no configuration.Read 15 Oct 2026 · github.com
CLI maintenance warning
The CLI repository warns that maintenance of the auxiliary tool is not guaranteed.Read 15 Oct 2026 · github.com
CLI tools
The public aimastering-tools repository provides command-line tools for the API with Windows, macOS and Linux installation instructions.Read 15 Oct 2026 · github.com
Controls and analysis
The web interface offers drag and drop, target loudness and mastering level customization, output format customization, spectrum analysis, and loudness analysis.Read 2 Oct 2026 · aimastering.com
Copyright date
The site footer carries a 2018 AI Mastering copyright notice.Read 15 Oct 2026 · aimastering.com
Data disclosure policy
The privacy policy says personal information is not provided to third parties without consent except for listed legal and operational exceptions.Read 15 Oct 2026 · aimastering.com
Desktop version
The maker released an offline desktop version and says development emphasis shifted toward it rather than the API.Read 15 Oct 2026 · aimastering.com
Drag-and-drop workflow
The web interface accepts audio by drag and drop.Read 15 Oct 2026 · aimastering.com
High frequency support
The maker says 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.Read 2 Oct 2026 · aimastering.com
Large-file limit
The FAQ says offline file size is primarily limited by the computer's available memory, unlike the online service.Read 15 Oct 2026 · aimastering.com
Limit: distortion reports
A Reddit user testing an AI mastering site reported too much added distortion and said they were not ready to entrust a project to it.Read 15 Oct 2026 · reddit.com
Limit: price criticism
Several Reddit commenters criticized paying about $5 per song for automated mastering and preferred free tools or subscriptions.Read 15 Oct 2026 · reddit.com
Limit: quality ceiling
Reddit commenters repeatedly described automated masters as below what a skilled engineer or careful manual processing can achieve.Read 15 Oct 2026 · reddit.com
Loudness analysis
The interface includes loudness analysis.Read 15 Oct 2026 · aimastering.com
Loudness and dynamics
Its limiter can balance loudness and dynamic range.Read 2 Oct 2026 · aimastering.com
Maker legal name
The commercial-notation page identifies the seller as Bakuage Co., Ltd.Read 15 Oct 2026 · aimastering.com
Mastering level
Users can adjust the mastering level.Read 15 Oct 2026 · aimastering.com
Node client
Official API documentation links a Node.js client and tutorial that run from the command line.Read 15 Oct 2026 · aimastering.com
Offline desktop
An offline desktop version is available, and the maker says its focus is shifting toward that version rather than the API.Read 2 Oct 2026 · aimastering.com
Offline file limits
The offline version does not have the same file limitations as the online service; the maximum file size depends on the computer's memory.Read 2 Oct 2026 · aimastering.com
Online wait time
The FAQ states that users cannot shorten online processing waits; it recommends the offline version for faster processing.Read 15 Oct 2026 · aimastering.com
Online waiting
The maker says waiting time for the online version cannot be shortened and suggests using the offline version to reduce it.Read 2 Oct 2026 · aimastering.com
Open-source licence
The phaselimiter mastering algorithm repository is public and licensed under MIT.Read 15 Oct 2026 · github.com
Other SDKs
The documentation says clients for other languages were being prepared with swagger-codegen and welcomes contributions.Read 15 Oct 2026 · aimastering.com
Output formats
The service provides output-format customization.Read 15 Oct 2026 · aimastering.com
Praise: affordable fallback
A Reddit commenter said AI mastering can be good enough for users with limited budgets even though it is below the best available quality.Read 15 Oct 2026 · reddit.com
Praise: useful results
A Reddit commenter reported getting good results from AI mastering when supplying an unmastered track and following preparation guidance.Read 15 Oct 2026 · reddit.com
Privacy data collection
The privacy policy says the service may collect registration, transaction, usage-history, IP, cookie, location and device-identification data.Read 15 Oct 2026 · aimastering.com
Reference sound
The related Bakuage service allows a reference recording to guide the desired sound.Read 15 Oct 2026 · bakuage.com
Rights to tracks
The FAQ says users retain full control of mastered tracks without service-imposed rights restrictions.Read 15 Oct 2026 · aimastering.com
Ruby client
Official API documentation links a Ruby client and tutorial.Read 15 Oct 2026 · aimastering.com
Runtime dependencies
The open-source algorithm lists Python/pipenv, FFmpeg, Intel TBB, LAPACK, BLAS, Armadillo and libsndfile dependencies.Read 15 Oct 2026 · github.com
Self-hosting
The FAQ says the open-source mastering algorithm can be run on a user's own server.Read 15 Oct 2026 · aimastering.com
Service interruptions
Terms allow suspension for maintenance, updates, disasters or communication failures and disclaim liability for resulting interruption damages.Read 15 Oct 2026 · aimastering.com
Source project status
The phaselimiter repository describes itself as inactive and says the maintainer may respond about once every three months.Read 15 Oct 2026 · github.com
Spectrum analysis
The interface includes spectrum analysis.Read 15 Oct 2026 · aimastering.com
System requirements
The commercial-notation page lists Windows 7 and Chrome as system requirements.Read 15 Oct 2026 · aimastering.com
Target loudness
Users can set a target loudness for mastering.Read 15 Oct 2026 · aimastering.com
Track rights
The maker says users retain full control over their mastered tracks, with no service restrictions.Read 2 Oct 2026 · aimastering.com
Usage statistics
The homepage reports more than 2,700 total users, over 50 daily users and over 3,600 monthly masterings, combined with Bakuage.com.Read 15 Oct 2026 · aimastering.com

Plans and prices

Free Plan Free $0 / Month Unlimited Mastering Read 2 Oct 2026 · aimastering.com
Free Plan Free Unlimited mastering Read 15 Oct 2026 · aimastering.com

Every AI Mastering plan and price →

Strong points and limits

Strong points

  • Free plan lists unlimited mastering
  • Adjustable target loudness and mastering level
  • Offline desktop version available
  • WAV, MP3, and MP4 inputs supported
  • WAV export available

Limits

  • Online waiting time cannot be shortened
  • Online service has file limits
  • Offline maximum file size depends on computer memory

Who it suits

It suits musicians seeking automated online mastering or an offline desktop option, and developers who want an API for mastering audio. The web interface includes loudness and spectrum analysis controls.

AI Mastering in depth

Read the full write-up

Overview

AI Mastering is an automated music-mastering service for musicians and producers who want adjustable loudness and analysis alongside the processing. Its mix of online, API and offline desktop access is useful, though the online wait and the desktop version’s computer-dependent file ceiling shape the choice of workflow.

Automatic processing aims to move music toward commercial sound, with a limiter for balancing loudness and dynamic range. Reference-track matching, WAV export and configurable loudness targets round out a service that offers more control than a one-click finish, without making the result entirely hands-off.

Key features

The web interface accepts files by drag and drop, supports WAV, MP3 and MP4 input, and allows adjustment of target loudness, mastering level and output format. Spectrum and loudness analysis help users inspect a track while making those choices. That combination suits people who want to guide the result; those seeking a fully unattended workflow may have less reason to use the extra controls.

A bass-preservation option can reduce attenuation in low frequencies. The maker says output can reach 24 kHz when the source sample rate is at least 48 kHz and the same rate is selected in custom settings, so that high-frequency capability depends on both the source and the chosen setting.

The API supports audio upload and download, mastering, and changes to target loudness and mastering level. Its documentation links JavaScript (Node) and Ruby client libraries and tutorials, giving developers starting points for integration. The maker says its focus is shifting toward the offline desktop version rather than the API, which makes the offline option the more aligned choice for users planning around the maker’s current direction.

The offline version does not share the online service’s file limitations; its maximum file size depends on the computer’s memory. Online waiting time cannot be shortened, and the maker suggests offline use to reduce it. The service also says users retain full control over mastered tracks, with no service restrictions.

Pricing

The Free Plan costs nothing, billed $0 / Month, and includes Unlimited Mastering. It is a practical fit for users who want ongoing access without a subscription charge or a stated mastering quota. WAV export, loudness targets and reference track matching are supported.

The free plan’s appeal is straightforward, but it does not remove the online waiting time or the online file limitations. Users with larger files or little tolerance for waiting should consider the offline version, whose maximum file size is governed by computer memory.

Platforms

AI Mastering is available on web, through an API and as offline desktop software. Listed platforms also include Android, iOS, Linux, macOS, Windows, extension and self-hosted. The range accommodates both browser-based mastering and local workflows, although online processing remains subject to waiting.

Who it's for

AI Mastering is best suited to musicians and producers who want free automated mastering but still value control over loudness, mastering level and output format. Its analysis tools and reference-track matching are relevant to users who want to assess a track rather than simply submit it for processing. Developers can use the API, while people handling large files or prioritizing shorter waits have a stronger case for the offline version.

It is a weaker fit for anyone who needs online processing to finish on a predictable schedule: the wait cannot be shortened. Users who depend on API development should also weigh the maker’s stated shift in focus toward the offline version.

Pros and cons

Pros: Unlimited mastering for free lowers the barrier for repeated use without a stated mastering quota.

Pros: Target loudness, mastering level, output format and audio analysis give users meaningful ways to guide and examine processing.

Pros: The offline version avoids the online service’s file limitations, with file size instead dependent on computer memory.

Cons: Online waiting time cannot be shortened, making the browser workflow less suitable when turnaround matters.

Cons: The maker’s focus is shifting away from the API and toward offline desktop software, a consideration for users building around the API.

Alternatives

Choose Auralith Forge if you prefer a one-time payment option: its free plan offers three full-length masters and unlimited 30-second previews, while an extra master costs €2.99, paid once with no subscription.

Matchering is a free, GPLv3 open-source option for users who want software available on Linux, macOS, Windows, web or self-hosted deployments.

TrackGleam is a fit for users seeking unlimited free mastering with WAV and MP3 output and no watermark or sign-up, across Android, iOS and web.

Consider SoundBoost.ai if its project-based revision model suits you: the free plan provides 10 revisions per project but no finalizing or downloads, while the annual Unlimited plan costs $48 a year.

SongUp AI is a web-based alternative for users looking for instant song creation, with three free instant songs for personal use and a Pro plan at $9.99 a month.

Tunr may suit users who want a free mastering key by email on macOS or Windows; its free plan counts per machine and allows three masters before a licence key.

HanoLab Mastering is an API and web option for users who prefer a monthly credit allowance: its free plan provides 30 credits per month and up to five Studio tracks monthly, with MP3 export marked by a watermark.

MasterForge is another web-based option.

Browse AI mastering tools for more options in the category.

Verdict

AI Mastering is a strong fit for musicians and producers who want unlimited free mastering with adjustable loudness, analysis and reference-track matching. Choose it for that combination of control and no stated mastering quota; look elsewhere, or use its offline version, if online waiting or file constraints are incompatible with your workflow.

Verdict

AI Mastering provides automated processing with adjustable loudness settings, analysis tools, and an offline version. Consider the online file limits and waiting time when choosing between online and offline use.

Where Specifiction places it

Alternatives to AI MasteringAll alternatives →