7 best soothe 2 alternatives in 2026 (free + paid, ranked)

why this guide exists

oeksound released the original soothe in 2016 and created a category. soothe 2 became the reference tool that every resonance suppressor since has been measured against. in 2026, soothe 3 raised the floor again. but the landscape below it has changed substantially too.

this guide ranks the seven options worth your time. not every resonance tool on the market. seven.

full disclosure: i make KERN SMOOTH, which sits at #3 on this list. it gets the same honest treatment as everything else. where another tool is better for your use case, i will say so clearly.

ranking is by overall capability and workflow value, not price. a free tool that solves the problem outranks an expensive one that adds features most producers will never use.

quick answer

what a resonance suppressor actually does

before the rankings: a quick frame for what these tools are solving.

every audio signal has resonant frequencies. peaks in the spectrum that ring longer or louder than the surrounding content. a vocal recorded in a boxy room. a snare drum with a hard ring at 800 Hz. a synth pad with a harsh bite at 3 kHz.

a resonance suppressor detects these peaks in real time and reduces them dynamically. unlike a static EQ cut, it only acts when a frequency is actually problematic. the result: the harshness goes away, the life stays.

the rankings

#1: oeksound soothe 3 ($259)

the reference tool, now in its third generation. soothe 3 shipped May 19, 2026 with a redesigned dual-mode engine and a genuine low-latency tracking mode. it is the best resonance suppressor available.

what it does well: the new soft mode uses an adaptive threshold, making it safe to drop on any source without over-processing. the hard mode carries the compressor-like grab that soothe 2 became known for as a creative effect. the headline workflow change is the low-latency mode: zero samples of added latency at base sample rates, about 1 ms at higher sample rates. real tracking through the suppressor is now usable. multichannel up to 9.1.6 and AAX for Pro Tools are built in. a single detail parameter replaces the two-knob system from soothe 2. tilt controls reshape the low-end response. linear phase in two clicks.

where it falls short: $259 retail (or $55 upgrade from a previous soothe) is the highest price in the category. iLok required: no physical dongle is mandatory, but it is iLok-based, which is a hard friction point for some workflows. TBProAudio do not publish a perceptual weighting model for it.

best for: working pros who track vocals through the suppressor, immersive and post engineers who need multichannel, Pro Tools users on AAX, and existing soothe 2 owners for whom the $55 upgrade pays back in one session. for a dedicated head-to-head with KERN SMOOTH, see the SMOOTH vs Soothe 3 comparison.

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#2: tbproaudio DSEQ3 (€79)

DSEQ3 is the most technically capable tool in the category below the soothe 3 price point. it applies dynamic processing at the per-FFT-bin level across the full spectrum from 10 Hz to 22 kHz. TBProAudio describe a dynamic equalizer per FFT frequency, all running at once.

what it does well: seven quality modes let you choose the trade-off between processing precision and CPU load, from eco to ultra. independent pre-filter bands let you shape the detection curve: tell the plugin to ignore certain frequencies or focus its detection on specific regions. built-in loudness matching (AB-LM Lite) makes before/after comparisons accurate rather than level-biased. no iLok (uses its own key-file system). v3 improved CPU efficiency over v2. linear and natural-phase options.

where it falls short: the interface is dense. not hostile, but DSEQ3 rewards producers who are willing to read the manual and understand what the controls do. less elegant than soothe 3 or smooth operator pro. TBProAudio do not describe a perceptual weighting model for it. whether that changes what you hear on a given source is a question for your ears, not for a spec sheet.

best for: technically-minded engineers who want maximum control over the spectral suppression process and are comfortable with a steeper learning curve. the best value for pure processing power in the €50 to €100 range.

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#3: KERN SMOOTH ($29)

full disclosure: this is my plugin.

KERN SMOOTH uses 40 ERB (equivalent rectangular bandwidth) bands mapped to how humans actually hear.[^2] the cochlea has roughly logarithmic frequency resolution: critical bandwidths are narrow low down and widen as frequency rises. a resonance at 1 kHz and a resonance at 8 kHz receive different treatment because your ears perceive them differently. this psychoacoustic approach lets the plugin concentrate suppression where it matters and stay conservative where it does not.

what it does well: psychoacoustic frequency analysis via the ERB scale. dual processing modes: resonance for sustained harshness, transient for percussive spikes. M/S routing for independent mid and side processing. real-time spectral display. under 3% CPU on macOS at 44.1 kHz, single instance. $29, permanent license, no iLok, no account, and nothing touching the network on the audio thread. one online activation, then it works offline, re-checking the key about once a month only if the machine is online. ships alongside CHECK, a free spectral mono compatibility analyzer.

where it falls short: no AAX (VST3 and AU only). no external sidechain input. shorter track record than soothe or DSEQ3. smaller preset library than soothe 3’s. five knobs means less granular per-parameter control than DSEQ3 or smooth operator pro.

best for: producers who want psychoacoustically-informed resonance suppression at an accessible price. anyone for whom iLok is a hard no. ableton users on macOS or Windows, and logic users on macOS, who work primarily in the box.

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#4: CRQL ANINA (free)

ANINA dropped in February 2026 and got a lot of attention quickly. it is a genuine tool, not a stripped-down demo.

what it does well: full-spectrum resonance suppression across 256 to 1024 bands at zero cost. sidechain mode for spectral ducking. delta monitoring. freeze mode for creative spectral imprinting. attack and release controls. block size control from 256 bands upward. VST3 and CLAP on macOS, Windows and Linux, plus AU on macOS. no signup and no iLok; CRQL do not spell out the rest of the activation flow, so confirm at the download. v1.1 (March 2026) added in/out gain controls and a tilt EQ for focusing the detection window.

where it falls short: no M/S processing. no perceptual weighting described by the developer. latency is approximately 11 ms, which is developer-reported and provisional: usable for most mixing work, but worth verifying in your DAW. no published CPU figure. newer product with a short track record.

best for: producers on any budget who need a capable resonance suppressor with sidechain ducking. the best free option in the category by a meaningful margin. for a detailed comparison with SMOOTH’s psychoacoustic approach, see the KERN SMOOTH vs ANINA comparison.

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#5: Kobito ResSup ($49 list, $19 on the launch discount)

ResSup launched in May 2026 and is the closest direct competitor to SMOOTH in the budget tier. the feature overlap is significant: dynamic suppression, M/S routing with stereo link, transient protection, harmonic preservation, and delta monitoring.

what it does well: selectable filter shapes per band: bell, band-pass, cut, and shelf. external sidechain input, so one signal can drive suppression on another track. this is the one feature SMOOTH does not currently offer. VST3 and AU on macOS and Windows. no iLok (sold via Gumroad).

where it falls short: $49 list, though a launch discount currently brings it to $19, with no announced end date, which makes it cheaper than SMOOTH while that lasts. verify the price at checkout either way. Kobito do not publish the band-placement scheme, so i cannot tell you whether it is perceptually weighted or not. no published latency figure. no free companion analyzer. shorter track record than any of the tools above it on this list.

best for: producers who specifically need external-sidechain resonance ducking. if that is your use case, ResSup belongs above SMOOTH on your personal list. for a full breakdown, see KERN SMOOTH vs Kobito ResSup.

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#6: baby audio smooth operator pro ($129)

smooth operator pro takes a different angle than most spectral suppressors: it gives you per-node control over individual detection points rather than a global threshold applied across the spectrum.

what it does well: per-node “override global” controls let you set individual threshold and depth per frequency node. 184 presets, which is a useful starting point for producers who prefer browsing presets to setting knobs from scratch. sidechain mode for cross-track unmasking. stereo imaging controls. linear phase processing. no iLok (Baby Audio use their own key-based activation, up to three computers, though they state they do not offer offline activation).

where it falls short: $129 regular puts it near soothe 3 territory in licensing cost without the same processing depth. it goes on sale often, but the regular price is the honest number to plan around. the per-node workflow is built for surgical control, but the learning curve is steeper than the competition. no M/S processing separate from the stereo imaging section. shorter track record than soothe or DSEQ3.

best for: producers who want surgical per-frequency control with a visual node interface, and who like setting up processing from a deep preset library.

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#7: TDR Nova (free)

TDR Nova is not a resonance suppressor. it is a 4-band dynamic EQ with a spectrum analyzer. it is on this list because it is where every producer should start before buying anything else.

what it does well: 4 bands plus HP/LP filters with multiple processing modes: parametric EQ, dynamic EQ, frequency-selective compression, multiband compression. accurate spectrum analyzer. completely free. no account, no activation. on macOS and Windows. no iLok (TDR Collector).

where it falls short: 4 bands means you must identify problem frequencies yourself. no automatic full-spectrum detection. when resonances shift over time or span a wide range of frequencies, 4 manual bands will not be enough.

the paid upgrade: Nova GE (approximately €60) adds bands, steeper filter slopes, frequency-dependent ratio, and upward compression. worth it if you live in Nova’s workflow.

best for: every producer who has not yet bought a dedicated resonance suppressor. use Nova to learn what resonances look like, where they live, and how dynamic gain reduction feels. when you hit the limits of 4 bands, then you know what you need from a dedicated suppressor.

also new in 2026

the category keeps moving. more resonance tools launched in 2026 after this ranking was set, and both are worth watching before your next purchase: Rast Sound Tamer (€99 list, €59 on their current offer, April 2026, with mid/side processing) and 2B Played Music ToneVeil (around €59.99 intro, list €129.99, July 2026), the most feature-complete rival to launch this year. both are too new to place with confidence here yet. on licensing, ToneVeil is not iLok, but it is account-based (the account is created at checkout), limited to 3 device activations, with a €10-per-plugin transfer fee. so SMOOTH’s difference from it is narrower than it first looks: not “offline” (ToneVeil offers an offline activation file too), and not the device count either, since SMOOTH is also three activations. what is left is no account, no transfer fee, and $29 against a €129.99 list. one more thing worth knowing: oeksound soothe 2 is now discontinued. its product page redirects to soothe 3, so buying soothe 2 new is no longer an option. the choice today is soothe 3 at $259, or one of the alternatives above.

missing from this ranking: Mastering The Mix RESO

a reader flagged in August 2026 that Mastering The Mix RESO (£59) belongs in this conversation and was not in it. he is right. it is a dynamic resonance suppressor whose Calculate Targets feature analyses your audio and hands you the most resonant frequencies to work from, with a frequency sweep tool and your own nodes on top. that guided starting point is a real workflow difference from the tools above, which mostly ask you to set a depth and let them run.

it is not ranked here and not in the table below, for the same reason Tamer and ToneVeil are not: i have not run it through the same material as the ranked tools, and i am not going to place it until i have. one thing to check yourself rather than take from this page: Mastering The Mix do not state the licensing or activation model on the RESO product page, so do not assume it matches any row in the table.

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the best free soothe 2 alternative

if your budget is zero, the answer is CRQL ANINA. it is the only free tool on this list that does what soothe actually does: full-spectrum resonance detection across 256 to 1024 bands, automatically, with sidechain ducking, delta monitoring, and a freeze mode. it ships VST3 and CLAP on macOS, Windows and Linux, with AU on macOS. CRQL do not publish the full activation flow, so check it at the download rather than take my word for it.

TDR Nova is the other free pick, but it solves a different problem. it is a 4-band dynamic EQ, not an automatic suppressor. reach for Nova when you already know the problem frequency and want to place a band on it yourself. reach for ANINA when you want the tool to find the resonances for you, the way soothe does.

one caution on the “free soothe alternative” lists circulating: several name tools that are not actually resonance suppressors. Wavegrove Vastaus, for instance, is a high-frequency tamer, not a full-spectrum suppressor. ANINA is the free tool i would reach for to replace the soothe workflow. Mercurial Tones Dagon also landed free in 2026 in roughly this space, and i have not put it through the same material.

the comparison

how to choose

the right tool comes down to three questions: what is your budget, do you know where the resonance is, and what does your workflow actually require.

if you know the exact problem frequency: TDR Nova first. a dynamic EQ band placed precisely on the problem is cleaner than any suppressor. it is also free.

if resonances shift and you cannot pin them down: you need a full-spectrum suppressor. soothe 3, DSEQ3, or SMOOTH will all handle this. ANINA will too, at no cost.

if you record vocals through the suppressor: soothe 3’s low-latency tracking mode changes the decision. it is the strongest option here for tracking through a spectral suppressor. SMOOTH’s LIVE mode reports roughly 23 ms and ANINA reports around 11 ms, which is developer-stated and worth confirming in your own DAW. on latency alone the order is soothe 3 first, ANINA second, SMOOTH third, and i am not going to dress that up.

if budget is the primary constraint: ANINA (free) for full-spectrum suppression with sidechain. SMOOTH ($29) for psychoacoustic processing and offline-forever licensing. both are genuine tools, not demos.

if you need external sidechain ducking: Kobito ResSup at #5 or soothe 3 at #1. SMOOTH does not currently offer external sidechain.

if you need AAX for Pro Tools: soothe 3, DSEQ3, or smooth operator pro. SMOOTH is VST3 and AU only.

the psychoacoustics behind the rankings

most resonance suppressors work on a linear frequency layout, which spreads their attention evenly in Hz. your ears do not divide the spectrum that way.

the human auditory system resolves frequencies in bands that get wider as pitch rises. at 1 kHz, you can distinguish differences of about 130 Hz. at 8 kHz, that resolution drops to about 890 Hz. these bands are called ERB (equivalent rectangular bandwidth) bands.[^2]

this has practical consequences for suppression:

• a resonance in the 2 to 5 kHz range (where speech formants live, where your ears are most sensitive) is far more noticeable than the same resonance at 12 kHz
• suppressing a narrow resonance at 500 Hz requires more precision than one at 8 kHz, because ears resolve finer frequency detail at lower pitches
• a tool that treats all frequencies equally will either over-process the highs or under-process the critical midrange

this is why SMOOTH’s ranking holds at #3 above ANINA and Kobito despite costing more than zero. the ERB-scale processing is a different architecture, not a different price tier. band count is a useful spec; psychoacoustic placement is a different axis entirely.

keep reading

• what a dynamic resonance suppressor actually is: the mechanism behind every tool on this list.
• smooth operator pro vs soothe 2: a closer head-to-head on the two spectral-balancer approaches.
• the best no-iLok plugins: if account-locked activation is a dealbreaker, start here.
• the best free mixing plugins: a from-scratch free chain beyond resonance.

frequently asked questions

frequently asked questions

what is the best free alternative to soothe 2?

CRQL ANINA is the best free option for full-spectrum resonance suppression. it processes across 256 to 1024 bands, includes sidechain ducking, delta monitoring, and ships VST3 and CLAP on macOS, Windows and Linux, with AU on macOS with no activation at all. TDR Nova (also free) is a 4-band dynamic EQ: useful for known problem frequencies, but it requires you to find the resonances yourself. start with Nova to build your ears, then move to ANINA when you need automatic full-spectrum detection.

what is the best budget alternative to soothe 2?

KERN SMOOTH at $29 is the one i would point most people at on value, and i make it, so discount that accordingly. it uses 40 ERB bands mapped to human hearing, includes M/S routing, runs under 3% CPU on macOS at 44.1 kHz, requires no iLok, and activates once then runs offline forever. it ships alongside CHECK, a free spectral mono compatibility analyzer. for pure technical breadth at a slightly higher price, DSEQ3 at €79 is the runner-up.

is soothe 2 still worth buying in 2026?

with soothe 3 available at $259 ($55 upgrade from soothe 2), buying soothe 2 new is hard to justify. if you already own soothe 2 and it is doing the job, keep it. soothe 3 adds real improvements (low-latency tracking mode, adaptive soft mode, multichannel) but not improvements that affect everyone. if you are buying fresh, the choice is soothe 3 at $259 or a serious alternative at a fraction of the price.

what is the difference between a dynamic EQ and a resonance suppressor?

a dynamic EQ has a fixed number of bands (typically 4-8) that you place manually on problem frequencies. a resonance suppressor watches the whole spectrum at once and pulls down whatever sticks out, on its own, wherever it appears. how finely it divides the spectrum varies a lot between tools, from a few dozen perceptually-spaced bands to thousands of FFT bins. dynamic EQ is the right tool when you know exactly where the problem is. a resonance suppressor is the right tool when resonances shift across the spectrum and you cannot pin them down.

does KERN SMOOTH require iLok?

no. SMOOTH activates once via Lemon Squeezy on first launch, caches the license locally, and runs offline after. it re-checks about once a month if you happen to be online, and stays licensed if that check fails or never happens. no iLok account, no dongle, no nightly check-in. one purchase, permanent access. this is a hard design constraint at KERN, not a feature that gets removed in future versions.

references

a note from the developer

i started building SMOOTH because i could not afford soothe 2. that is the honest origin story. the cheap alternatives at the time were cheap for a reason. so i spent three years reading papers and building the tool i wished existed at a price i could justify.

ranking my own plugin at #3 on a list i wrote is not a hedge. it is what the tools actually warrant. soothe 3 is better software for certain workflows. DSEQ3 has more raw spectral processing depth. SMOOTH’s case is the architecture and the price, not the feature count.

most of these have a demo or a free version. ResSup’s free window closed after its first 1000 licences, so check before you count on one. install two or three of them, run them on the same harsh vocal, compare with your ears. the ranking is a starting point. your ears are the finish line.

if i missed a tool that belongs here, or if your experience differs from mine: jonas@kernaudio.io.