audition fidelity
mix & master delivery
A focused delivery tool for mix and mastering engineers.
Send your client a single link.
Works in any browser.
Built-in DDP player.
Clients hear the actual mix or master,
not a re-encoded streaming preview. Your mixes and masters stay in your Dropbox or Google Drive Approvals and timecoded comments.
not a re-encoded streaming preview. Your mixes and masters stay in your Dropbox or Google Drive Approvals and timecoded comments.
Mark has created a beautiful, simple and responsive interface. I find the ergonomics of choosing files and making a playlist to be much faster and easier than my previous solution. And boy am I thrilled at the results! My files play directly from my own storage, and the sound quality is perfect high fidelity.
Free trial, no signup required
Click to try it now
The trial version is fully functional with all Pro features
Client playback is limited to 60 seconds, and client downloads are disabled.
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I rely on Mastrly daily for my professional workflow, and it has been outstanding. The platform is intuitive and offers a highly customisable front-end for clients. It is regularly updated with genuinely useful features and is backed by fantastic customer support from Mark. It is refreshing to find such a high-quality, continuously improving tool without the burden of recurring fees. Highly recommended.
what it is
Mastrly is different.
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Your mixes and masters live in your Dropbox or your Google Drive. The only other party who ever has access is your client, and you have total control over what they can hear and what they can download. There is no Mastrly server, no account, and we have no access to your files at any time.
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The Mastrly program is a single HTML file. Literally one file, and everything happens 100% in the browser. You can host this file yourself or use our free hosted version at mastrly.cloud/app.
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Mastrly is a one-time purchase, with free updates for life. If you host it yourself, we can't make changes that you didn't ask for. If you use the free hosted version you will always have the latest features.
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The client player is a blank canvas for you to add your own branding. Mastrly is not even mentioned.
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There is a free Mastrly Player app for iPhone and Android, so you and your clients can audition the music and exchange feedback on the go.
DDP player
Share a DDP image and your client can audition the CD master with sample accurate, gapless playback directly in the browser (pro edition).
metadata
Mastrly extracts and displays artist, track and other metadata for all audio formats and DDP.
sharing with clients
One click access for your clients, no registration or sign in. You control what is shared and what can be downloaded.
simple hosting
Mastrly is a single static HTML file, and all functions run entirely in the web browser. Host it yourself or run it directly from our web site.
no backend
No cloud infrastructure or databases to maintain and pay for. If your site is up, Mastrly is up.
your storage
Mixes and masters stay in your Dropbox or Google Drive and never pass through any third party.
branding
Add your logo, colour scheme, links and contact details to give clients a seamless experience (standard and pro editions).
client player
Try the client player here. The v1 and v2 button crossfade seamlessly between versions.
free mobile apps
Mastrly Player for iPhone and Android
licensing
Mastrly licence model
When you buy Mastrly you are not signing up for a subscription, you are buying a perpetual software licence for a single user. We send you a licence key which you paste on first run. That's it.
Mastrly is built and maintained by Mark Hammond. For any questions, please reach out and you’ll get a quick reply.
Email hello@mastrly.cloud.
The privacy policy was updated on 13 October 2026. These pages now offer Google Analytics, which loads only if you accept cookies. The Mastrly app is unchanged and loads no analytics.