The leap in sound you're hoping for from your next upgrade is already in your room. Antinodal measures it with your iPhone and tells you what to change, and where — so your system finally gives you everything it has. No external microphone needed.
iPhone 12 Pro or later · LiDAR Free to scan · no account · no snake oil
These are real screens from the app, measured in a real living room — not mock-ups.
A 3D model you can turn in your hand, with your speakers, your seat, and the spot on every wall where a mirror would show you a speaker. That spot is where a panel does its work.
LiDAR scan · first reflections · bass nulls
Your phone listens to your own system from your seat. It can tell one speaker arriving 0.45 ms before the other — about 15 cm of path — and says which way to move.
Arrival time · level · treble, left against right
Measured, not guessed from the furniture — and judged against the sound you told us you like: analytical, natural or enveloping.
RT60 by octave, 125 Hz – 16 kHz
Not a wall of findings. Five moves ranked by what you'll hear, each located with a tape measure from two walls — and how to build it yourself, or where to buy it.
Ranked recommendations · DIY or ready-made
This is the whole idea. Move the chair, turn a speaker, hang a panel — then measure again. Every scan and every measurement is kept, so each change is checked against the last. Not a promise: a before and an after.
Every result kept · before against after
The loop at the heart of Antinodal, from countless tests in a real living room: electrostatic panels, two metres apart. Measured, the chair moved, measured again — same system, same phone, a few minutes apart. Nothing else changed. This is a real before and after, not an illustration.
Voices lean to the right.
The left speaker's sound has 33 cm further to travel, so the centre of the stage pulls right.
Sitting nearer the right speaker makes it louder, too — the image leans twice.
The grey band is what a phone can honestly separate. Inside it, we call the two sides equal.
Another evening, another small thing. A vase of flowers came off the front of the left panel. The app heard that side's treble come back by 2.2 dB at 8 kHz — and the speaker hadn't moved an inch.
A typical living room, and the four changes Antinodal most often asks for — each with its exact place. Every number on it is worked out with the app's own acoustics.
Illustration of a typical room — not a customer's. Drag to turn.
The room resonates between its walls. Sit in the wrong spot and whole bass notes disappear — no amplifier brings them back.
One speaker reaching you a fraction of a millisecond first, a side wall answering too soon — and the stage leans and smears.
Put a speaker 50 cm from the wall behind it and the reflection off that wall cancels it at about 171 Hz — the body of a kick drum, the chest of a male voice. No cable fixes that. Moving the speaker does.
One guided run, in the order your room asks for it. The app tells you what to do at every step, and every step can be redone on its own later.
Aim at each speaker and tap. The app pins them to the room itself, so the marks stay put while you move.
Under a minuteThe LiDAR scanner in your iPhone maps the walls, openings and furniture as you walk. Then you sit down where you listen.
Two to three minutesThe phone plays a tone to hear how long your room rings. Then your own system plays a sweep, left then right, and the phone listens from your seat.
About a minute and a halfThen: five things to do, in order of how much you'll hear them.
Honesty isn't our small print; it's the product. The LiDAR scanner measures your room to the centimetre. The microphone is uncalibrated, so we use it only where calibration doesn't matter: comparing — left against right, this seat against that one, before against after — and timing how long the room rings.
We tell you what you'll notice. Then you check it yourself, by measuring again.
If a measurement goes wrong, we say so. If your phone moved, the result tells you in a yellow box — and gives no advice from it.
Free moves come first. Every treatment comes with how to build it yourself; the shop is one option of two.
The advice can't be bought. No maker pays to change what Antinodal recommends.
Most audiophiles agree: treat the room first, and add digital room correction afterwards only if you still need it. Antinodal does the first part. It never sits in your audio chain — no DSP, no EQ — and everything it recommends is physical: where things stand, and what goes on the wall.
The full account of what a phone can — and can't — measure →
Antinodal is made by people who spend their evenings in the sweet spot, for people who do the same. No manufacturer behind it, no product to push — just the room, measured honestly.
Awkward shapes. Open sides. Speakers the LiDAR can barely see.
The hardest rooms to get right are the ones people actually live in, so that's where Antinodal was built. Countless tests, until marking a speaker worked every time. Every figure checked against a tape measure, and when the app and the tape disagreed, the app changed.
“I'd rather give you five good recommendations than fill your screen with findings.” John · Founder
No subscription. See your room before you pay a thing.
Yes. Most of what Antinodal recommends first costs nothing: moving a speaker a few centimetres, moving your chair, matching the toe-in. When treatment would help, it tells you exactly what, how big and where — usually a panel that hangs on a hook.
No. Antinodal uses the iPhone's own microphone, and only for what an uncalibrated microphone does well: comparisons — left against right, before against after — and how long the room rings. If you already own a calibrated mic and love curves, keep using them; Antinodal is for the listener who wants the answer.
An iPhone Pro or Pro Max from the iPhone 12 Pro onwards — the models with a LiDAR scanner — running iOS 26.2 or later. The scanner is what measures your room to the centimetre.
With any stereo system. The reverb measurement needs nothing but the phone. For stereo balance your own system plays a test sweep: send it over AirPlay, or play our sweep file from a USB stick, Roon, a NAS or any streamer — the phone just listens.
About five minutes for the whole room: under a minute to mark your speakers, two or three minutes walking the room, and a minute and a half sitting still in your seat. Each part can be redone on its own — after you move something, for example.
Where your chair should be to avoid bass nulls and centre the image; how far your speakers should stand from the wall behind them; whether both are placed and aimed alike; where panels go for the first reflections, always in pairs; whether your absorption is too thin; and where not to put a subwoofer. Five at a time, ranked by what you'll hear.
Yes — it was built in one: an L-shaped living room with an open side. It works around the furniture you're keeping, and shows separately what it would do with a free hand, so you can see what your constraints cost you.
Yes — the part that decides what you do. With bass sweeps played through your own speakers, the phone hears which notes boom and which vanish at your seat, from 30 to 250 Hz. Antinodal also works out from your room's shape where the bass cancels across your floor, and labels that as calculated. Together they tell you where your chair, your speakers and your bass traps should go. You can check it yourself: play a steady bass line and walk slowly toward the speakers. You'll hear yourself walk out of the null.
No. Every recommendation is complete without a shop — material, size, exact position — and comes with instructions to build it yourself. Ready-made suppliers are listed as a convenience, and if a link ever pays a commission, the app says so right beside it.
There's no account. Your scans and recordings stay on your phone unless you choose to share them. Read the privacy policy.
We're opening Antinodal to 100 listeners before launch. You scan your room, run the full measurement with your own speakers, and tell us what you found. Your findings shape the app.
You'll need an iPhone with LiDAR: 12 Pro or any later Pro or Pro Max.
100 places
A tape measure, a mirror, twenty minutes. No app needed.
While you wait:
Changes that improve any listening room →