Your EV Is Silent. Your Heart Isn't.

There's a moment that happens to almost everyone who switches to an electric car.

You pull out for the first time, you flatten the accelerator, and the thing goes — instantly, violently, better than the combustion car you traded in. And then you notice what's missing. No rise. No build. No sound telling you what just happened. Just wind, tyres, and a faint whirr.

Most people get over it. A lot of people don't.

Go read any EV owners' forum and you'll find the same thread over and over, usually apologetic: "I love this car. It's faster than anything I've owned. But I miss the noise." People feel slightly silly saying it. They shouldn't.

Sound isn't decoration. It's feedback.

For a century, drivers read their cars through their ears. Engine note told you load, revs, when to shift, when you were near the limit, whether the thing was happy. You didn't consciously decode it — you just knew, the way you know a friend's mood from their voice.

Take that away and something genuinely goes missing. Acceleration becomes abstract. Fast, but weightless. You get the physics without the drama.

Carmakers know this, which is why so many EVs now ship with synthesized sound piped through the speakers. But you get whatever your manufacturer decided, if they bothered at all — and a lot of those systems are a spaceship whoosh nobody asked for.

We wanted something else: not a sci-fi noise, but an engine. A real one, that behaves like a real one.

Why most engine-sound apps disappoint

The App Store already had engine noise apps. We tried them. They mostly fail the same two ways.

They don't know what your car is doing. A loop plays, maybe it gets louder when you tap something. It's a soundtrack, not an instrument. The disconnect is immediate and it kills the illusion within about thirty seconds.

Pitch-shifting doesn't sound like revving. If you take a recording of an idling engine and speed it up, you don't get a revving engine — you get a chipmunk. Real engines change pitch and keep their resonances anchored, because the exhaust and body cavities don't shrink when the crank spins faster. Naive pitch-shifting drags everything up together, and your ear catches the lie instantly.

So we started from the physics instead.

Building an engine from the firing order up

A four-stroke engine completes its cycle over 720 degrees of crankshaft rotation, and each cylinder fires exactly once in that window. That's the whole basis of engine sound: a repeating pattern of pressure pulses, spaced according to where each cylinder sits in the firing order.

So we model it that way. Each cylinder gets a combustion pulse placed at its actual firing angle. We sum them into one complete cycle, run a Fourier transform, and drive an oscillator at RPM/120 Hz — so the firing pattern scales with revs exactly like the real thing.

This is where it gets interesting, because the firing order is why engines sound different from each other.

A cross-plane V8 — the classic American muscle configuration — fires unevenly within each bank. Two cylinders on the same side fire back to back, their exhaust pulses collide in the manifold, and the spectrum fills up with half-orders sitting underneath the main firing frequency. That ladder of half-orders is the burble. It's not a stylistic choice; it's a consequence of crankshaft geometry.

A flat-plane V8 alternates banks perfectly. No half-orders, just a clean harmonic stack — which is why exotics scream instead of rumble.

A V10 sits between the two. A V12 fires every 60 degrees, essentially two straight-sixes interleaved, which is why it sounds less like combustion and more like singing.

We tuned each engine against published order analyses of real recordings and verified the results with FFT — checking that the firing peaks land where the math says they should, that the cross-plane ladder is present, that the V12 stays clean.

And the resonances — the exhaust and cabin formants — stay fixed in absolute Hz while the pitch rises. That's the detail that kills the chipmunk effect.

We also added the imperfection. Real engines never fire two identical cycles; mixture and spark vary slightly, which is what makes a cammy idle lope. So the rough engines wobble at idle and smooth out under load, and the V12 barely wobbles at all.

Reading your car through your phone

None of that matters if the sound doesn't track your actual driving. So EVRoar fuses three sensors:

• Accelerometer

  for instant response — the revs load up the moment you press the pedal, before speed has built.

• Gyroscope

  to reject cornering and bumps, so a pothole doesn't sound like a downshift.

• GPS

  as a slow anchor for absolute speed.

You can rebalance those three yourself if you want the character sharper or calmer.

On top sits a virtual transmission: configurable gear count, top speed, and shift style from relaxed short-shifting to holding every gear at redline. It upshifts, it downshifts, and — because this is what a real driver does — it drops a gear early when you're slowing down, rather than waiting until the engine is lugging.

Everything routes over Bluetooth to your car's speakers, so it fills the cabin instead of buzzing out of your phone.

It's not only for EVs

This surprised us, but it shouldn't have: a lot of the interest came from people with combustion cars.

Modern ICE cars are quiet. Sound-deadened, turbocharged, actively cancelled. Plenty of people drive a perfectly good petrol car that just doesn't sound like much. EVRoar works exactly the same way in an ICE car — the phone doesn't know or care what's under the bonnet, it only reads motion.

So your four-cylinder can sound like a cross-plane V8. Your diesel estate can sound like a V12 on the motorway. A rental car on a good road can sound like whatever you want. It's driven entirely by how the car moves, so it works in anything that moves.

What's in it

Nine engines, each with its own redline and character:

Two are free forever. The rest unlock with a single one-time purchase — US$6.99, no subscription. It's a fixed set of engines, and charging monthly rent for a sound would be absurd.

The app is available in English, German, French, Spanish, Italian and Chinese.

How you actually use it

Mount your phone however you like — EVRoar works out which way is forward from gravity and the gyroscope, then calibrates against GPS. Pair with your car's Bluetooth. Pick an engine. Drive.

What it isn't

Worth being straight about this: EVRoar is sound only. It runs entirely on your phone and plays through your speakers. It doesn't connect to your car's ECU, doesn't change performance, doesn't touch emissions, and doesn't make your car louder to anyone outside it. It's for the person in the driver's seat who wants the drive to feel like something.

If that's you — if you went electric and quietly miss the noise, or you drive something petrol that just doesn't sing — it's live now.

EVRoar on the App Store →