iZotope Ozone 8

Ozone 9

Master Rebalance: Adjust the levels of vocals and other instruments in a stereo audio file, solve balance issues without needing the original stems.

Low End Focus: Quickly adjust the contrast and definition of low frequencies for a "hard hitting master every time," without need for a more complicated plug-in chain.

Improved Tonal Balance Control: Tonal Balance Control is improved with smoother metering, resizability, new target curves, and inter-plugin communication with Relay and Nectar for gain control across the mixing and mastering stages.

Expanded Master Assistant: Choose from a modern or vintage vibe, with loudness targets for CD and streaming.

Match EQ module: Ozone 9 offers a new experience for Match EQ, with a better preset workflow, the ability to match from a reference track, and deeper controls that let users match parts of the frequency spectrum.

Vintage Modules: A collection of Vintage modules add "warmth, grit, and vibe" to a creator's music, now in Ozone 9 Standard.

Updated UI/UX: Ozone 9 is faster and easier to use, with a modernized resizable interface, fluid metering, and an expanded module chain.

Native Instruments NKS Support: NKS support puts Ozone into the creative production process. Access controls, presets and DSP from within an NKS-supported environment, such as MASCHINE or a KOMPLETE KONTROL keyboard.

Improved Performance: Experience faster performance and smoother workflows, improved visualizations and fluid metering.

Component plug-ins: Use any Ozone 9 Advanced module as a separate plug-in in a DAW, meaning users get more than 10 component module plugins.

https://www.izotope.com/en/products/ozone.html