iZotope Ozone vs Kilohearts Ultimate

iZotope Ozone9.1Visit Kilohearts Ultimate7.5Visit

Higher score iZotope Ozone #3 in Audio Plugins 9.1/10 10-day trial Free trial✓ 1 of 3 features Visit iZotope

vs

Kilohearts Ultimate #11 in Audio Plugins 7.5/10 10-day trial Free trial✓ 2 of 3 features Visit Kilohearts

• iZotope Ozone fits best

  Producers focused on AI-assisted mastering

• Kilohearts Ultimate fits best

  Sound designers wanting modular effects and synthesis

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature	iZotope Ozone 9.1/10 Visit ↗	Kilohearts Ultimate 7.5/10 Visit ↗
At a glance
Editor score	9.1	7.5
Ranking	#3 in Audio Plugins	#11 in Audio Plugins
Best for	Producers focused on AI-assisted mastering	Sound designers wanting modular effects and synthesis
Pricing model	Paid	Paid
Starting price	$55 one-time	$9.99/mo
Free plan	—	—
Free trial	10 days	10 days
Free trial length	10 days	10 days
Deployment	Desktop	Desktop
Platforms	macOS, Windows	Windows, macOS
Integrations	12 integrations	9 integrations
Features iZotope Ozone 1/3 · Kilohearts Ultimate 2/3
External sidechain	Not checked yet	✓ (best)
Oversampling	✓	✓
Surround support	Not checked yet	Not checked yet
Specs
Plugin formats	AAX, AU, VST3	VST2, VST3, AAX, Audio Unit
Effect types	equalization, dynamics, compression, limiting, saturation, stereo imaging, loudness processing, dithering	modular synthesis, multiband effects, convolution, wavetable filtering, wavetable distortion, all-pass filtering, distortion, graphic EQ, parametric EQ, dynamics
License model	Both	Both
Product scope	Suite	Bundle
Our review
Pros	Master Assistant creates custom processing flows to guide mastering. Advanced includes Stem EQ for separate processing of vocals, bass, drums and instruments. Reference comparison, Codec Preview and dithering support finishing work.	Includes Phase Plant, Multipass, Snap Heap, and Kilohearts Essentials. Run effects as DAW plug-ins or Snapins inside Kilohearts hosts. Macros, automation slots, and compatible external sidechain workflows.
Cons	The $55 Elements edition has core tools; editable modules start with Standard at $219. Advanced costs $499, making its 20-module suite a substantial one-time purchase. Ozone focuses on mastering rather than broad music production tasks.	The $399 perpetual bundle does not include Content Banks. The separate $9.99 monthly subscription is not the Ultimate perpetual license. Future additions require completing the bundle at a discount.
Our verdict	iZotope Ozone is a software suite for audio mastering, aimed at musicians, producers and audio engineers who want tools for finishing tracks. It covers equalization, dynamics, limiting, stereo imaging, saturation, loudness control,… Read the review →	Kilohearts Ultimate is a collection of audio plug-ins for music producers, sound designers, and electronic musicians. Its centerpiece tools include Phase Plant, a modular synthesizer, plus Multipass and Snap Heap, which host effects in… Read the review →

Strengths and trade-offs

• iZotope Ozone — where it wins

  • Master Assistant creates custom processing flows to guide mastering.
  • Advanced includes Stem EQ for separate processing of vocals, bass, drums and instruments.
  • Reference comparison, Codec Preview and dithering support finishing work.

  Where it doesn't

  • The $55 Elements edition has core tools; editable modules start with Standard at $219.
  • Advanced costs $499, making its 20-module suite a substantial one-time purchase.
  • Ozone focuses on mastering rather than broad music production tasks.

• Kilohearts Ultimate — where it wins

  • Includes Phase Plant, Multipass, Snap Heap, and Kilohearts Essentials.
  • Run effects as DAW plug-ins or Snapins inside Kilohearts hosts.
  • Macros, automation slots, and compatible external sidechain workflows.

  Where it doesn't

  • The $399 perpetual bundle does not include Content Banks.
  • The separate $9.99 monthly subscription is not the Ultimate perpetual license.
  • Future additions require completing the bundle at a discount.

• iZotope Ozone9.1/10 · 10-day trial

  AI-assisted mastering with reference tools and tiered, one-time editions.

  Visit iZotopeFull verdict →
• Kilohearts Ultimate7.5/10 · 10-day trial

  A modular synthesis and effects bundle, available as a $399 perpetual license.

  Visit KiloheartsFull verdict →