AUDIOPHILIO › REW COMPARISON

Every REW feature, side by side.

Room EQ Wizard is the free reference for measuring rooms and speakers. Below is everything REW does, taken from its own feature list and help files, and exactly where Audiophilio stands on each item today and in Audiophilio 2.0.

Disclosure: I make Audiophilio. REW's features come from roomeqwizard.com, checked November 9, 2026. Audiophilio 2.0 is in testing now; features marked 2.0 are built but not yet released. Spot a mistake? Email support@audiophil.io and I'll fix it.

74

REW FEATURES COMPARED, INCLUDING THE PRO UPGRADE

26from 15

FULL MATCHES IN AUDIOPHILIO 2.0, PLUS 16 PARTIAL. 13 FEATURES ARE NEW OR IMPROVED IN 2.0

11

THINGS AUDIOPHILIO DOES THAT REW DOESN'T TRY TO, FROM LIDAR ROOM SCANS TO TURNTABLE SETUP

THE SHORT VERSION

REW is free and goes deeper on almost everything in this list. That isn't changing, and this page doesn't pretend otherwise.
Audiophilio 2.0 closes the gaps that matter most for tuning a room: impulse and step response, minimum and excess phase, full ISO 3382 decay and clarity, spatial averaging, room-mode filters, FIR export and STI.
The rest is planned. Every gap that 2.0 doesn't close is on Audiophilio's roadmap, from a timing reference to multi-mic capture, and the table marks each one.
Audiophilio covers ground REW doesn't: it runs on iPhone and iPad, scans rooms with LiDAR, diagnoses your system, sets up turntables and trains your ears.

PART 1 · THE FULL REW FEATURE SET

Everything REW can do

REW is one of the most complete measurement suites available at any price. Here is all of it, grouped by job. The table in part 2 checks each item against Audiophilio.

019 FEATURES

Measurement & capture

Log sweeps or stepped sines, measured with a USB mic, an analog mic or an SPL meter, with a loopback or acoustic timing reference when timing matters.

Log-sweep frequency response
USB or analog measurement mic
SPL meter as input
Mic & soundcard cal files
Loopback / acoustic timing reference
Offline measurement
Stepped sine, 96 points/octave
Clock-drift correction
ASIO drivers

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029 FEATURES

Signal generator

A full test-signal bench: tones, sweeps, bursts, multitones and calibrated noise, all exportable to WAV.

Sine with harmonics
Square
Sawtooth
Dual, triple & multitone
Tone & CEA-2010 bursts
Linear & log sweeps
Filtered pink & white noise
Periodic noise
WAV export

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036 FEATURES

Meters & real-time analysis

An integrating sound level meter with logging, a real-time analyzer down to 1/48 octave, and a two-channel oscilloscope.

A, C & Z weighting
SPL calibration
Leq & SEL
SPL logging
RTA to 1/48 octave
Two-channel scope

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044 FEATURES

Frequency response & phase

Magnitude, phase and group delay, split into minimum and excess phase to show where EQ can actually help.

Phase & group delay
Minimum & excess phase
Minimum-phase generation
Phase wrap / unwrap

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058 FEATURES

Impulse & time domain

Impulse, step and energy-time views, with full control over windowing, filtering and timing.

Impulse response
Step response
Energy-time curve
IR windows
Frequency-dependent windowing
Octave-filtered IR
Delay calculation
Sub/main alignment tool

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065 FEATURES

Room acoustics

ISO 3382 reverberation and clarity, a high-resolution frequency-domain RT60, a multi-sub room simulator, and STI in the Pro upgrade.

EDT, T20, T30, Topt
Frequency-domain RT60
C50, C80, D50, Ts
Speech Transmission Index
Room simulator, 8 subs

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074 FEATURES

Distortion

Harmonic distortion with harmonic phase, THD+N, intermodulation and multitone distortion.

THD & harmonics
THD+N
Intermodulation
Multitone distortion

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084 FEATURES

Speakers & drivers

Electrical impedance with a sense-resistor rig, peak dissipation, component models and Thiele-Small extraction.

Electrical impedance
EPDR
L/C component model
Thiele-Small, added mass

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095 FEATURES

Waterfalls & spectrograms

Fourier and burst-decay waterfalls; Fourier, burst-decay and wavelet spectrograms; 3D views.

Fourier waterfall / CSD
Burst decay
Fourier spectrogram
Wavelet spectrogram
3D views

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103 FEATURES

Averaging & trace math

Overlay any set of measurements, average them three ways, and add, subtract or merge traces.

Overlays
RMS, vector & dB averages
Trace arithmetic

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118 FEATURES

EQ & room correction

Automatic EQ to a target, tunable fitting, predicted results, room-mode analysis with pole-zero plots, and modal filters.

Auto EQ to a target
Speaker-type targets
Tunable fitting
Predicted response
Room-mode analysis
Pole-zero plots
Modal filters
Q definitions

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128 FEATURES

Import, export & hardware

Text and WAV import and export, filter files for 30+ named equalisers, direct send to some hardware, and a scripting API.

Text import/export
WAV/AIFF IR import
Filter IR export
Measurement IR export
30+ equaliser formats
Direct send to AVRs & DSPs
Scripting API
Built-in help

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13PAID UPGRADE

REW Pro

A one-time upgrade for professional users: simultaneous multi-input capture for mic arrays, and STI (listed under room acoustics).

Multi-input capture
Per-input cal & weighting
Up to 16 RTA traces
STI per IEC 60268-16

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PART 2 · LINE BY LINE

REW vs. Audiophilio

A check means Audiophilio has the feature. It doesn't mean it goes as deep as REW. The notes say where it's narrower.

FEATURE	REW	AUDIOPHILIO 1.9 TODAY1.9	AUDIOPHILIO 2.0 COMING2.0	NOTES
01Measurement & capture
Log-sweep frequency response	Yes	Yes	Yes	Log sweep with deconvolution; sweep lengths from 128k to 8M samples.
USB or analog measurement mic	Yes	Partial	Partial	Built-in mic, or a USB measurement mic like the UMIK-1 with its calibration file. Analog mics through an interface aren't a documented setup.
SPL meter as the input, with C-weighting compensation	Yes	No	No, planned
Mic and soundcard calibration files	Yes	Partial	Partial	Mic calibration files (REW and miniDSP .cal). No soundcard calibration.
Loopback or acoustic timing reference	Yes	No	No, planned	Each sweep is timed on its own.
Offline measurement from recorded sweeps	Yes	No	No, planned
Stepped-sine measurement, up to 96 points per octave	Yes	Partial	Partial	The Distortion Analyzer steps a sine through 22 third-octave points from 63 Hz to 8 kHz.
Clock-drift correction for separate input and output devices	Yes	No	No, planned
ASIO driver support	Yes	Not applicable	Not applicable	A Windows driver standard. Audiophilio uses Apple's Core Audio.
02Signal generator
Sine, with optional harmonics	Yes	Partial	Partial	Sine with octave, third-octave or fine frequency steps. No added harmonics.
Square wave	Yes	Yes	Yes
Sawtooth	Yes	No	No, planned
Dual, triple and multitone	Yes	No	No, planned
Tone bursts and CEA-2010 bursts	Yes	No	No, planned
Linear and log sweeps	Yes	No	No, planned	Sweeps run inside the measurement tools, not as a generator signal.
Random pink and white noise, with filtered variants	Yes	Partial	Partial	White, pink and brown noise. No speaker, sub or band-limited variants.
Periodic pink and white noise	Yes	No	No, planned
Export signals to WAV	Yes	Yes	Yes	From both the Signal Generator and the Noise Generator.
03Meters & real-time analysis
SPL meter with A, C and Z weighting	Yes	Yes	Yes	Also B and ITU-R 468 weighting, with Slow, Fast and Impulse response.
SPL calibration against a reference	Yes	Yes	Yes	Trim the live reading to match a reference meter or calibrator.
Integrating SPL: Leq and SEL	Yes	Partial	Partial	Shows minimum, average and peak. No true Leq or SEL integration.
SPL data logging	Yes	Yes	Yes	Record a session and export it as CSV.
Real-time analyzer, up to 1/48 octave	Yes	Partial	Partial	31-band third-octave RTA.
Two-channel oscilloscope with a math channel	Yes	Partial	Partial	Single-channel scope with a zero-crossing trigger.
04Frequency response & phase
Phase and group delay	Yes	Yes	Yes
Minimum phase, excess phase and excess group delay	Yes	No	Yes, new in 2.0	Shows which peaks and dips EQ can fix, and how far a sub lags the mains.
Minimum-phase response generation	Yes	No	Yes, new in 2.0	Used for the phase overlay and for FIR export.
Phase wrap and unwrap	Yes	Partial	Partial	One fixed phase view (wrapped to ±180° in 2.0). No toggle.
05Impulse & time domain
Impulse response	Yes	No	Yes, new in 2.0	Computed from the same sweep as every other view.
Step response	Yes	No	Yes, new in 2.0
Energy-time curve (ETC)	Yes	Yes	Yes	A standalone tool and a Frequency Response view.
Adjustable impulse-response windows	Yes	No	No, planned
Frequency-dependent windowing	Yes	No	No, planned
Octave-filtered impulse response	Yes	No	No, planned
Delay calculation and adjustment	Yes	Partial	Partial	Delay Finder measures speaker-to-mic delay and distance with a tone burst.
Sub and main alignment tool	Yes	No	No, planned	2.0's excess group delay shows the timing offset, but there's no tool to align them.
06Room acoustics
RT60 per ISO 3382: EDT, T20, T30, Topt	Yes	Partial	Yes, new in 2.0	T20 today. 2.0 adds EDT, T30, Topt, curvature and fit quality, in octave bands from 125 Hz to 4 kHz (no third-octave bands).
Frequency-domain RT60 decay plot	Yes	No	No, planned
Clarity and definition: C50, C80, D50, Ts	Yes	Partial	Yes, new in 2.0	C50 and C80 today. 2.0 adds D50 and centre time, per octave band, as a table rather than a graph.
Speech Transmission Index (STI)	Yes, with REW Pro	Partial	Yes, new in 2.0	Today, a rough estimate from C50. 2.0 computes STI from the impulse response per IEC 60268-16, included with Premium.
Room simulator, up to 8 subwoofers	Yes	Partial	Partial	Room Designer maps room modes as a heat map, plus first reflections and SBIR. It doesn't simulate a predicted response for multiple subs.
07Distortion
Harmonic distortion: THD and individual harmonics	Yes	Partial	Partial	THD plus H2 to H8 at each stepped frequency. No harmonic phase, and no distortion from a sweep.
THD+N	Yes	Yes	Yes	Shown alongside THD.
Intermodulation distortion (IMD)	Yes	No	No, planned
Multitone total distortion	Yes	No	No, planned
08Speakers & drivers
Electrical impedance	Yes	No	No, planned	The Impedance Analyzer plots an acoustic response that reflects impedance. True ohms need a sense-resistor rig.
EPDR (equivalent peak dissipation resistance)	Yes	No	No, planned
Inductor and capacitor component model	Yes	No	No, planned
Thiele-Small parameters (added mass, sealed volume)	Yes	Partial	Partial	Calculates Qms, Qes and Qts from values you read off an impedance curve. No added-mass or sealed-volume method.
09Waterfalls & spectrograms
Fourier waterfall and spectral decay	Yes	Yes	Yes	In Frequency Response, plus a live Waterfall tool.
Burst-decay waterfall and spectrogram	Yes	No	No, planned
Fourier spectrogram	Yes	Partial	Partial	A live spectrogram of the mic signal, not of a measured impulse response.
Wavelet spectrogram	Yes	No	No, planned
3D views	Yes	Yes	Yes	3D waterfall.
10Averaging & trace math
Measurement overlays	Yes	Yes	Yes	Overlay saved measurements and imported REW files.
RMS, vector and dB averaging	Yes	Partial	Partial, improved in 2.0	dB average today. 2.0 switches to power (RMS) averaging and can build EQ from the average. No vector average.
Trace arithmetic: add, subtract, multiply, divide, merge	Yes	No	No, planned
11EQ & room correction
Automatic EQ to a target	Yes	Yes	Yes	Finds peaks and fits up to 32 parametric filters (peak and shelves) toward a target, with boosts capped.
Speaker-type and room-tilt target curves	Yes	Partial	Yes, new in 2.0	Flat, Harman, House and imported targets today. 2.0 adds Subwoofer, Full Range and Room Tilt. No crossover modeling.
Tunable auto-EQ: match range, flatness, Q limits	Yes	No	No, planned	Uses fixed defaults.
Predicted response and live EQ'd waterfall	Yes	No	No, planned
Room-mode analysis: frequency and decay time	Yes	No	Yes, new in 2.0	Estimates each mode's frequency, level and T60 from the measured response. REW fits the impulse response instead.
Pole-zero plots	Yes	No	No, planned
Modal filters, with Q matched to the mode's decay	Yes	No	Yes, new in 2.0	Correct room modes adds cut filters whose Q matches each mode.
Configurable Q definitions	Yes	No	No, planned
12Import, export & hardware
Frequency response import and export (text)	Yes	Yes	Yes	REW-compatible text both ways, with phase where available.
Impulse response import (WAV, AIFF)	Yes	No	No, planned
Export EQ filters as an impulse response (WAV)	Yes	No	Yes, new in 2.0	Minimum-phase FIR at 44.1, 48, 88.2 or 96 kHz, for convolution engines.
Export a measurement's impulse response (WAV)	Yes	No	No, planned
Filter files for named equalisers	Yes	Partial	Partial, improved in 2.0	REW/Generic, miniDSP biquad and Equalizer APO today. 2.0 adds CamillaDSP and generic biquad coefficients. REW lists 30+ named devices.
Direct send to AV receivers and DSPs	Yes	No	No, planned	Planned where Apple platforms allow: MIDI and network control, and serial on Mac only. Until then, Audiophilio exports a file you load yourself.
Scripting API	Yes	No	No, planned
Built-in help	Yes	Yes	Yes	Help for every tool, inside the app.
13REW Pro upgradeSTI is also a Pro feature; it's listed under room acoustics.
Multi-input capture for mic arrays	Yes, with REW Pro	No	No, planned	One input at a time for now; planned for multichannel interfaces. Meanwhile, 2.0's guided multi-position capture builds a spatial average with a single mic.
+Beyond REWThings Audiophilio does that REW doesn't try to.
Runs on iPhone and iPad	No	Yes	Yes	REW runs on Windows, macOS and Linux.
Guided multi-position capture	Partial	No	Yes, new in 2.0	Walks you through 3 to 9 seats, saves each sweep, averages them and reports seat-to-seat bass variation. In REW you take and average the measurements yourself.
LUFS loudness meter	No	Yes	Yes
Polarity checker	Partial	Yes	Yes	In REW you read polarity from the impulse response.
Wow and flutter	No	Yes	Yes
Turntable setup suite	No	Yes	Yes	Tonearm alignment and speed stability.
Room Designer with LiDAR room scanning	No	Yes	Yes	Scan a room, place speakers and treatment, and see standing waves and reflections before you buy anything.
System Builder with diagnosis	No	Yes	Yes	Finds problems in your signal chain and ranks them, with plain-English fixes.
Ear Trainer	No	Yes	Yes	Learn to hear all 31 third-octave bands.
Acoustic calculators	No	Yes	Yes	Eleven, including room modes, first reflections, SBIR, Schroeder frequency, crossovers and cartridge resonance.
iCloud sync across your devices	No	Yes	Yes

Counts at the top leave out ASIO, which doesn't apply on Apple platforms. Partial marks are counted separately from full ones.

What's planned after 2.0

Rows marked planned are on Audiophilio's roadmap. There are no dates yet, and this table will change as each one ships. A few come with limits set by the hardware or by Apple's platforms:

Direct control of receivers and DSPs. MIDI works on iPhone, iPad and Mac, and network control works where the maker publishes the protocol. Serial control is possible on Mac only, because iPhone and iPad have no serial access. Exporting a file you load yourself stays the default.
Multi-mic capture and two-input tools. Mic arrays, electrical impedance, the loopback timing reference and the two-channel scope need an audio interface with enough inputs: any multichannel interface on Mac, or a class-compliant one on iPhone and iPad.
ASIO. A Windows driver standard. Apple's Core Audio does the same job, so there's nothing to add.

Everything in Audiophilio is built from REW's public documentation and standard acoustics, not from REW's code.

Questions

When does Audiophilio 2.0 come out?

It's in testing now. Everything marked 2.0 in the table is built, and it ships once real-room testing is done. Follow the changelog for the release.

Does 2.0 cost extra?

No. 2.0 is a free update. The new analysis lives in the Frequency Response & PEQ and RT60 tools, which are part of the one-time $44.99 Premium unlock. There's no subscription.

Is Audiophilio a replacement for REW?

No. REW is free and goes deeper, as the table shows. Audiophilio is the toolkit in your pocket, and the two trade measurements in REW's text format, so plenty of people use both. The longer comparison covers how.

Which one is more accurate?

Both measure with log sweeps, and in practice your microphone and signal path matter more than the software. No head-to-head accuracy test has been published, so be wary of anyone who claims one is more accurate without data.

Where does the REW feature list come from?

REW's own features page, Pro upgrade page and online help, checked November 9, 2026. REW changes over time, so check its site for the current picture.

Try it

The SPL meter, noise generator and calculators are free. If you already use REW, import one of your measurements and see how it looks next to a fresh sweep from your phone.

DOWNLOAD ON THE APP STORE

Sources

REW features: the "Features in detail" list at roomeqwizard.com/features.html, the Pro upgrade page and the REW help files, checked November 9, 2026 (current release V5.31.3; STI needs V5.40 and the Pro upgrade). Audiophilio: the app itself (1.9, and 2.0 in testing) and its changelog. REW is developed by John Mulcahy. Audiophilio is independent and isn't affiliated with or endorsed by REW.