TDR Kotelnikov is described as 'wideband dynamics processor combining high fidelity dynamic range control with deep musical flexibility'. There are eight alternatives to TDR Kotelnikov for Windows, Mac, iPhone, iPad and Linux. The best alternative is iZotope Ozone. It's not free, so if you're looking for a free alternative, you could try Rough Rider (series). Other great apps like TDR Kotelnikov are Fabfilter Pro C (Paid), Maximus (Paid), Complexer (Paid) and NYCompressor (Paid).
As the industry’s most comprehensive mastering suite, Ozone 8 adds to its legacy by introducing new intelligent signal processing, spectral shaping, Tonal Balance Control, and more. It’s the smartest version of Ozone yet.
FabFilter Pro-C 2 is a high-quality compressor plug-in for the most demanding engineers. Whether you need subtle mastering compression, an upfront lead vocal, that magic drum glue or deep EDM pumping: Pro-C 2 gets the job done with style!
Complexer 2 is a multi-stage dynamics processor, featuring three independently controlled dynamics processors, each with a choice of six different modes: Upward and downward compressors, upward and downward expanders, a limiter, and a gate.
NYCompressor is a compressor plugin for Windows, Mac and iOS, available in VST and Audio Unity plugin format. FEATURES – Compression ratio up to 1:10. – Optional key signal filtering. – True sidechaining (4 inputs, needs to be supported by host) – Hard/soft knee.