SYMPTOM · 01
Bass that "booms" until your head aches
Sound piles up between walls and a few frequencies get boosted 8–15 dB — which is why some tracks slam your chest and others lose their bass entirely.
Acouvero · iOS · Free
Every room
Every room
has a voice.
Sweep duration
3–12sec
Gear required
1iPhone
Add-ons / calibration
0none
Price
$0free
PROBLEM · 01
The same pair of speakers,
The same pair of speakers,
never sounds the same room to room.
SYMPTOM · 02
A "smeared" stereo image
The direct sound reaches your ears first, the wall reflections arrive 4–8 ms later. Your brain merges them — and the vocals slide off-center while instruments float around.
SYMPTOM · 03
A tail that drags on too long
The note ends, but the room keeps ringing for half a second — the tail of one note drags into the head of the next. Drums lose attack, vocals turn mushy, busy passages collapse.
METHOD · 02
Three steps,
Three steps,
and your room makes sense.
No microphone to buy, no cables to run, no decibels to memorise. Place the iPhone where you usually sit — Acouvero handles the rest.
STEP 01 · MEASURE
First, listen.
Your speakers play a log sweep — the default "phone check" preset runs 180 Hz to 4 kHz, and you pick 3, 6 or 12 seconds. The iPhone mic records the whole thing: the direct sound from the speakers, plus every reflection bouncing back from walls, ceiling and furniture. With external speakers you can switch to the low-frequency preset (15–300 Hz), the full-range preset (20 Hz–20 kHz), or a custom range anywhere within 10 Hz–20 kHz.
Duration
3 / 6 / 12 sec
Your job
Sit still
Output
Raw impulse response
SWEEP · 180 HZ – 4 KHZ
LOGARITHMIC
STEP 02 · ANALYZE
See what's off.
From the recording, Acouvero pulls apart three things: ① which frequencies your room is boosting or burying (frequency response); ② where the reflections come from and how delayed they are (early-reflection map); ③ how long the room keeps ringing after a sound stops (RT60).
Resolution
Up to 1/24 octave
Range
20 Hz – 20 kHz
Problem spots
Auto-flagged
FREQUENCY RESPONSE · LP
±15 DB
STEP 03 · OPTIMIZE
Hand you things to do.
Not a wall of numbers — a plan. Move the sofa 30 cm forward. Put a panel on the left wall here. Cut 6 dB at 65 Hz on the sub. Each suggestion comes with a "why"; if you don't care, just do it.
Output
Action list
Priority
Biggest wins first
Cost
From $0
ROOM PLAN · TOP-DOWN
SCALE 1 : 50
IN THE APP · 03
Not a meter. A report for you.
No twenty-knob interface. No jargon pop-ups. Acouvero translates everything it measured into a handful of things you can actually do.
Measuring
Report & plan
3D room
PRO · 04
Beyond the phone check,
Beyond the phone check,
it's a pro measurement kit.
Connect external speakers and a USB measurement mic, and Acouvero reaches desktop-grade depth — real-time spectrum, multi-position averaging, REW interoperability, PEQ and subwoofer alignment, all on your phone.
TOOL · 01
Real-time spectrum (RTA)
1/1 to 1/24 octave bands, A / C / Z weighting, Fast / Slow response and peak hold. With a USB measurement mic and a level calibration, readings show true dB SPL.
TOOL · 02
Overlays & multi-position averaging
Overlay 2–6 frequency responses with 1/3–1/48 smoothing, level alignment and range presets. Measurement groups average in dB, RMS or vector form, and group-vs-group comparison shows spatial consistency at a glance.
TOOL · 03
REW interoperability
Import and export frequency-response text files, import IRs as WAV / AIFF, or export the sweep stimulus and deconvolve an offline recording. Calibrated records export true dB SPL.
TOOL · 04
PEQ target matching
Parametric target curves with limits on filter count, gain and Q — deep cancellation notches are left alone on purpose. Export to Generic text, Equalizer APO, miniDSP and CamillaDSP YAML.
TOOL · 05
Subwoofer alignment
Two-way alignment works out delay, gain and polarity, with before / after sum previews. Multi-sub mode optimizes 1–4 subwoofers across several seats — favor the main seat or lift the worst one.
TOOL · 06
AI acoustic assistant
Runs on your own Anthropic API key, stored only in the device Keychain. It reads your measurements, runs the same PEQ and alignment algorithms, evaluates layout changes — and with your confirmation, starts a measurement itself. Interrupted sessions resume where you left off.
Why it's free ·
WHY FREE
WHY FREE
Room measurement used to be either ridiculously expensive or ridiculously hard. We think it should feel like a speed test — tap once, wait a minute, see what you're actually hearing. Free. Full stop.
Do I need to buy a special mic?
No. The built-in mic isn't absolutely calibrated — results carry a low-confidence label and serve as a cross-check against the geometric model, which is enough to get started. When you need absolute accuracy, plug in a USB measurement mic like the miniDSP UMIK-1 / UMIK-2 — their REW calibration files are supported, and a one-time 94 dB calibrator reference gives you true dB SPL readings.
Is this just another EQ app?
No. EQ flattens the curve with filters; Acouvero tells you what's wrong physically first. Often a small furniture move beats any EQ — and only then does EQ make sense.
My room is small / cluttered / irregular — does it still work?
Yes. Acouvero doesn't assume a shoebox — the sweep measures the actual sound field. Bedrooms, living rooms, L-shapes, open kitchens — all tested.
Does it upload audio from my home?
No. All signal processing happens on-device. The recording is just sine tones — no voice, no music — and we collect zero audio. The one exception: if you choose to use the AI acoustic assistant, it sends the conversation and the measurement data it needs to Anthropic — under your own API key. Never open it, and the app makes no network requests at all.
How much will I have to spend on fixes?
Every suggestion is tagged with effort and cost. The first one is almost always $0 — half the problem usually goes away by moving furniture. Panels and EQ come later.
Surround / multi-channel support?
Up to 5.1: left / right / center / surround L-R / subwoofer can all be added in the 3D room, as many as you like — and every speaker fully participates in reflection paths, RIR simulation and panel recommendations, not just for show. 7.1 (rear surrounds) and Atmos height channels aren't supported yet.
What about Android?
iOS-only for now. With a thousand different mic models in the Android ecosystem, hitting our accuracy target is too costly — we'll revisit down the road.
How does it compare to REW?
Complementary. REW is a full desktop measurement suite — very deep, with a learning curve to match. Acouvero puts room capture, sweeps, analysis and recommendations on your phone, with results on the spot. They're not rivals: Acouvero exports frequency response as REW text, and REW's exported response text and IRs (WAV / AIFF) import back in for further analysis. Want the full Acouvero vs HouseCurve vs REW breakdown? Read the comparison.
Does the AI assistant cost extra?
The app is free and we charge nothing for the assistant — it runs on your own Anthropic API key, so usage is billed to your Anthropic account. The key lives only in your device's Keychain. Don't use the assistant, and the app makes no network requests at all.
iOS · App Store
One minute,
One minute,
and you finally hear your room.
Download free on the App Store and start in a minute. No ads, no list-selling.