Question: How can I get constructive criticism on my music without hiring a professional audio engineer?

Mix Check Studio is a good option. This AI-powered tool offers feedback on music mixes and masters so you can spot problems and fix them. You upload your track, tell the service whether it's a mixed or mastered track, and what genre it is, and you'll get a detailed report on how to improve. The service is free to use, so it's a good option for musicians and audio engineers.

Another option is Cryo Mix, a collection of tools for music mixing and mastering. It includes AI mixing, pitch correction and an audio separator that isolates individual stems from a single file. The mastering tool will bring your sound up to industry standards with adjustments to dynamics and EQ. Cryo Mix's interface is designed to be easy to use, so you don't need to be an audio engineering expert to get good results.

If you want more professional-sounding processing, check out eMastered, an online AI-powered service that lets you upload tracks and get mastering results in seconds. It's based on the expertise of Grammy-winning engineers and offers stem-based editing. eMastered offers a free account with limited features, good for getting started, and paid options for more advanced results.

Last, LANDR is an all-purpose music production service that includes AI-powered mastering, music distribution and a collection of plugins and samples. It offers a variety of pricing options, including unlimited mastering and distribution, so it's a good option for musicians and producers at any level.