Plugin comparison
Specs, price and the Dubspot Score, side by side — with our verdict on which effect to buy.
Independent score / workflow fit / buying signal
Some links on this page are affiliate links. If you buy through them, Dubspot may earn a commission at no extra cost to you. It never affects our scores or what we recommend (read our policy).
Contenders
FabFilter Pro-Q 4 is an equalizer plug-in with up to 24 bands, dynamic EQ, spectral dynamics, and linear/natural/zero-latency phase modes.
Effect / iZotope
iZotope Ozone 11 is a mastering plugin suite, offered in Elements, Standard, and Advanced editions, with AI-assisted Master Assistant workflows.
Editorial analysis
FabFilter Pro-Q 4 is a single, best-in-class equalizer, while iZotope Ozone 11 is a full AI-assisted mastering suite that happens to include an EQ module. Producers pit them against each other because both promise to make tracks sound finished, but they solve fundamentally different problems at different points in the workflow.
Decisive signal
This is a scope mismatch more than a rival matchup. Pro-Q 4 does one job with unmatched depth: precise, dynamic, and creative equalization on any track, driven by a fast GPU spectrum analyzer, up to 24 bands, spectral dynamics, and switchable zero-latency, natural, and linear phase. Ozone 11 does the opposite by bundling an entire chain (Maximizer, Match EQ, Dynamics, Imager, Exciter, Clarity, Stem Focus) behind Master Assistant, an AI pass that builds a mastering starting point in seconds. In short, Pro-Q 4 is a per-track surgical and tonal tool you reach for constantly during mixing, whereas Ozone 11 is an end-to-end mastering environment you load once on the stereo bus.
Choose FabFilter Pro-Q 4 if
The producer who reaches for EQ on nearly every track and wants the fastest, deepest tool for surgical cuts, tonal shaping, and taming resonances without a separate dynamic-EQ plugin.
Open plugin file →Choose iZotope Ozone 11 if
The producer or project-studio engineer who needs a guided, all-in-one mastering chain to get a competitive stereo master fast, ideally bought below list price.
Open plugin file →Buying verdict
For everyday mixing, Pro-Q 4 wins decisively and its 9.3 score reflects a tool that has no real equal at what it does; at $199 it is expensive for an EQ but you use it on nearly every channel. Ozone 11 scores lower at 8.4 partly because it has been superseded by Ozone 12, so its value now hinges entirely on buying at a clear discount, but nothing in Pro-Q 4 replaces its guided limiting, imaging, and loudness stages. Most serious setups end up owning both, since one shapes individual tracks and the other finalizes the master.
Technical matrix
| Signal | FabFilter Pro-Q 4 | iZotope Ozone 11 |
|---|---|---|
| Price | $199 | — |
| Dubspot Score | 9.3 | 8.4 |
| Formats | VST, VST3, AU, CLAP, AAX Native, AudioSuite | VST3, AU, AAX |
| EQ bands | Up to 24 bands | — |
| Filter shapes | Bell, Notch, High/Low Shelf, High/Low Cut, Band Pass, Tilt Shelf, Flat Tilt, All Pass | — |
| Filter slope | Up to 96 dB/octave, plus Brickwall option for LP/HP | — |
| Processing modes | Zero latency, Natural Phase, Linear Phase, plus Gentle/Warm character modes | — |
| Dynamic processing | Dynamic EQ and spectral dynamics with adjustable attack/release | — |
| Channel modes | Mid/side and left/right; surround up to Dolby Atmos 9.1.6 | — |
| Editions | — | Elements, Standard, Advanced |
| Plugin formats | — | AAX, AU, VST3 (64-bit only; VST2 not supported) |
| New modules (Advanced) | — | Clarity, Stem Focus, Transient/Sustain, Upward Compress |
| Master Assistant | — | AI-powered assistant with Assistive Vocal Balance vocal checker |
| Standard modules | — | Maximizer, Imager, Match EQ, Dynamics, EQ, Exciter, Vintage |
| Apple silicon | — | Native Apple silicon (M-series) and Intel Mac support |
Quick reference
For someone learning mastering, Ozone 11 is friendlier because Master Assistant analyzes the track and builds a complete starting chain, removing the blank-page problem. Pro-Q 4 is easier to grasp as a basic EQ but its spectral-dynamics and multi-phase features go unused by beginners, so it can feel like overkill until your ear develops.
They are not substitutes: Pro-Q 4 is a per-track equalizer with no limiter, imager, or loudness stage, while Ozone 11 is a full bus-level mastering chain whose single EQ module is far shallower than Pro-Q 4. Many engineers use Pro-Q 4 throughout the mix and Ozone 11 only on the master, so owning both is common rather than redundant.
Ozone 11 is one version behind, so it only makes sense at a clear discount; at that point the Advanced edition can undercut buying separate mastering plugins. Pro-Q 4 holds its $199 price because it stays current and gets used on almost every track, making it easier to justify as an everyday workhorse than a superseded suite bought at full price.
See the full plugin database for more comparisons.