Give your EV the voice of a real engine.
WattGrowl synthesizes a V8 growl, turbo whistle and pops & bangs live on your phone and plays them through your car speakers. No hardware, no OBD dongle, no wiring.
- 37 synthesized engines
- Any EV
- Any car stereo
- 3-day free trial of Live Drive
How it works
Mount, pick an engine, drive.
Live Drive turns the way you drive into an engine note, in real time, using only your phone.
Mount your phone
Put it in any phone mount and connect it to your car stereo over Bluetooth, USB or a cable. WattGrowl calibrates itself to the mount.
Pick an engine
Small-block V8, twin-turbo straight-six, rotary, flat-plane V8, V12, diesel or superbike: choose from 37, or build your own.
Drive
The phone's motion sensors and GPS tell WattGrowl how hard you accelerate, brake or coast. You hear the pull, the shifts, the turbo and the crackle on lift-off.
Features
Every engine is modeled, not looped.
Firing order, exhaust pipes, muffler, turbo, supercharger and rev limiter all shape the sound, so each engine has its own voice.
Live Drive Premium
Real-time engine sound from your real driving: idle, pull, gear changes, turbo spool, blow-off and lift-off crackle. Keeps steady over bumps and rough roads. Try it free for 3 days.
37 engines
Small-block and big-block V8s, a flat-plane screamer, straight-sixes, a rally boxer, V10s, V12s, a quad-turbo W16, rotaries, diesels and superbikes.
Pops, bangs & crackle
Overrun crackle shaped by each engine's own exhaust, rally anti-lag, dual-clutch upshift "brap" and limiter bangs. Tap POP for a backfire at a standstill.
Gearboxes & drive modes
Manual, dual-clutch, automatic, sequential, CVT or direct drive. Shift with on-screen paddles or your steering-wheel media buttons. Eco to Track modes.
Sound Studio
Mix exhaust, intake, mechanical, turbo and pops on their own faders, then fine-tune with a three-band equalizer. Build your own engine in the Workshop.
Sounds right in your car
Front/rear sound stage puts the intake ahead and the exhaust behind you. Latency compensation keeps the sound in step over Bluetooth. Music ducking balances it with your playlist.
- Simulator with on-screen throttle and brake: try any engine anywhere
- Garage rev mode: blip the throttle while parked
- Throttle pad at traffic lights: rev at a standstill, back to gears when you move off
- 0–60 mph, 0–100 km/h and quarter-mile timers, trip statistics
- Stops when the car audio disconnects, restarts when the same car reconnects
- Drive recordings, plus classic, modern, race and retro dashboard themes
Screens
Built to read at a glance.
A dark dashboard with big controls, an engine garage you can search, and a studio for shaping the sound.
Pricing
Free to play with. Premium to drive.
Try every engine for free. Try Live Drive free for 3 days, then keep it with the yearly plan or unlock it for life.
Free
- All 37 engines
- Simulator with throttle and brake
- Garage rev mode
- Sound Studio and Engine Workshop
- Timers, trip statistics and recordings
Live Drive Premium
- Engine sound from your real driving
- Self-calibrates to your phone mount
- Revs at a standstill, pops on lift-off
- Cancel anytime in Google Play; cancel during the trial and you pay nothing
Prices in US dollars. Google Play shows the price in your local currency.
Good to know
For the driver, inside the car.
Not a pedestrian warning
The sound plays inside the car for you. WattGrowl is not a pedestrian warning system and does not replace your car's AVAS.
Eyes on the road
Set everything up before you drive. Once started, WattGrowl runs hands-free with the screen off.
Your data stays on your phone
No account, no ads, no tracking. Location is used only to measure speed for the sound. Privacy policy
FAQ
Questions
Do I need any extra hardware?
No. WattGrowl uses your phone's own motion sensors and GPS. There is no OBD dongle and nothing to wire into the car.
Which cars does it work with?
Any electric car, and any car stereo you can connect your phone to over Bluetooth, USB or a cable. You can also listen on headphones; a hearing-safety cap limits the volume there.
Does it need Android Auto?
No. WattGrowl plays through the car stereo like any audio app. You start it on the phone, and it keeps running with the screen off.
Can people outside the car hear it?
Only as much as they would hear your car stereo. The sound is for the people inside the car.
What is free and what is premium?
The simulator, garage rev mode, all 37 engines, the Sound Studio and the Engine Workshop are free. Live Drive, the engine sound from your real driving, is premium: try it free for 3 days, then $2.99 a year, or pay $14.99 once for life.
How does the free trial work?
Pick the yearly plan in the app and the first 3 days are free. When the trial ends, Google Play charges $2.99 for the year unless you cancel before then in Google Play under Payments & subscriptions. The trial is for new subscribers.
Is there an iPhone version?
An iPhone version is in development and coming soon. WattGrowl is available on Google Play for Android today. Follow us on Instagram @engine_sound_app to hear when it lands.
Miss the growl?
Bring it back to your EV.
iPhone Coming soon
Follow us on Instagram @engine_sound_app for new engines and the iPhone launch.