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Maximizer Plugin by UrsaDSP
Boost Boost
Boost by UrsaDSP is a Virtual Effect Audio Plugin for macOS and Windows. It functions as an Audio Units Plugin, a VST 3 Plugin and an AAX Plugin.
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KVR Rank

Overall: 3650   2794   3496

30-Day: 3688; 7-Day: 2617; Yesterday: 6171

Boost increases the loudness of audio material. Use it as a signal enhancer during mastering, or to reveal hidden details while mixing or creating new sounds. Set the Output Ceiling, dial in Attack and Release times, and use the main Boost dial to get anything from a gentle increase in average loudness to an all-out smashed-up signal.

Boost applies transparent signal maximization for a professional sound, and thanks to the unique Focus control, you can maximize a signal upwardly, applying more gain to quieter sounds – no clipping, ever. A Drive control (plus extra Punch setting for transients) are on-hand to add energy and warmth to the signal.


  • Increase average loudness of a signal with no clipping and minimal distortion.
  • Unique Trajectory Technology detection algorithm maximizes gain at every step.
  • Focus control can push quiet sections harder than loud sections and reveal hidden details in audio with up to 52dB dynamic gain.
  • Set Input gain up to 28dB and Output ceiling up to 0dB – Boost's algorithms mean there's no clipping, ever, and True Peak detection is onboard too.
  • Set Stereo Linking from 0% to 100% and process in mid/side mode
  • Choose Attack and Release times to complement your audio and maximization style.
  • Add harmonic distortion and character using the Drive control, and activate the extra Punch setting to add more power to transients.
  • Set Max Gain to limit the range of maximizing, keeping very quiet sounds unaffected.
  • Compare signals with the Bypass button.
  • VST/AU/AAX plugin for PC and Mac.

Focus: Upward Maximizing

Increase Boost's Focus control and quieter parts of the audio signal will be processed harder than louder parts. By bringing quiet signals up instead of peak-limiting loud signals, Boost offers a different way to control dynamic range, and can bring out hidden details in an audio signal.

Increase Average Loudness

Boost's 'upward maximization' process is an alternative way to reduce a signal's dynamic range without simply clipping the highest peaks into distortion or resorting to 'soft clipping'. This method, combined with Boost's Trajectory Technology, leaves the signal more transparent, and can squash dynamic range even further than most limiters, should you wish.

Reveal Hidden Details.

Boost can restore elements that have been suppressed by heavy-handed mixdowns or during the mastering process.

In mixing, use Focus to bring out reverb tails and mechanical noises that were previously too low-down in the mix.

Sound designers can find inspiration using Boost to put a new spin on existing audio, transforming loops, breathing new life into vocals, and bringing out a new focus in acoustic instrument recordings.

Trajectory Technology

Boost can get the most out of any audio signal thanks to Trajectory Technology. Placed at the detection stage of the signal path, this algorithm ensures that the plugin is always achieving the maximum possible gain increase, while keeping the signal transparent and avoiding non-linearities.

You can check out the UrsaDSP whitepaper on Trajectory Technology to find out more.

{See video at top of page}

Latest User Reviews

Average user rating of 5.00 from 1 review

Reviewed By Re:Creation Studio
July 31st, 2020

Amazing plugin - Very rarely do new limiters make it into my mastering chain, but this is just awesome - Great controls and sound quality, a total bar-gain :D.

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Comments & Discussion for UrsaDSP Boost

Discussion: Active
1 August 2020 at 3:40pm

Strange review. Is it a fake? You say you seldom add new limiters. How can you then tell that tis is a 5 star compared to others? Why did you the go for this one? Seems like you are in the delvelopers "family" and not an objectiv reviewer. Awful lot of fake reviews on KVR these days. Takes away the meaning of the whole concept.


2 August 2020 at 6:38pm

Hi Rumdrum, .

I'm the developer behind Boost (and Lagrange before it) and I hear what you are saying.

Whilst I didn't pay for or encourage anyone to leave that review and I honestly have no idea who they are, I am grateful that they put their thoughts on this page, it's always nice when you hear that the effort you put into something is appreciated.

But, equally, I am also glad that you and others are sceptical of relatively anonymous reviews. If this didn't happen then people would just buy based on marketing alone and quality would not matter.

This is the reason there's a 14 day demo period available for the plugin. If you're after a plugin to manage dynamics please give it a try and I'd welcome any feedback. If not then hopefully you'll check out what I write next.

Dave @UrsaDSP.

17 April 2022 at 4:00am

Hi, appreciate your attitude, I'm on the trial version, and so far I'm really impressed with how far I can push Boost while still maintaining clarity, with a lot of control. I'll very likely buy the full version soon. Is KVR the only place I can buy it? Looking forward to more UrsaDSP gems (ie Lagrange is great too). PJT peterjolly333@gmail.com.

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