FourKeys vs Engine Sound

FourKeys is a super satisfying sound button toy. 4 big buttons, tap to play — blast funny sound effects anytime on your iPhone and Apple Watch. Perfect for pranks, parties, or just stress relief. WHAT YOU CAN DO - Tap to instantly play sound effects - Create multiple keyboards with custom colors, text, and icons - Choose from 40+ built-in sound effects - Record your own sounds (up to 15 seconds) - Import audio files (MP3, M4A, WAV, and more) - Set a custom image for each key cap - Share keyboard packs with friends — swap and play! iPHONE + APPLE WATCH Manage your keyboards, record audio, and import sounds on iPhone. On the go, just raise your wrist and tap on Apple Watch — fun anytime, anywhere. INTERACTIVE WIDGET Add an iOS widget to your Home Screen. Play your favorite sounds without even opening the app — prank your friends effortlessly! FREE & PRO Free includes: • 3 keyboards • 40+ built-in sounds • Sound recording • Audio import Upgrade to FourKeys Unlimited (one-time purchase) to unlock: • Unlimited keyboards • Custom App Icons (8 color themes) • Keyboard pack import/export & sharing PRIVACY FIRST All data is stored locally on your device. No analytics, no tracking, no ads.

Give any car the sound it deserves. Engine Sound synthesizes a lifelike engine in real time and plays it softly under your music. It follows your speed and acceleration, so the engine swells as you pull away and settles when you cruise — without ever stopping your music or podcasts. FIVE ENGINES • Inline-4 — eager and rev-happy • V8 — deep, lumpy rumble • Rotary — smooth, high-pitched buzz • Inline-6 — silky and balanced • V10 — shrieking, race-bred wail Preview each one with a tap. FEELS CONNECTED • GPS combined with the motion sensors reacts faster than GPS alone • Virtual gearbox: hear the shifts as you accelerate • Big animated tachometer with gear, RPM and shift lights PLAYS NICE WITH YOUR AUDIO • Mixes under music, podcasts and navigation — never takes them over • Choose how loud it sits under your music and how much it swells on acceleration • Subtle and Lead modes TRY IT PARKED Test Drive mode lets you rev every engine with an on-screen throttle before you head out. All sound is generated on your iPhone. Your location never leaves the device. Please drive safely and follow local laws. Keep the volume at a level that lets you hear traffic and emergency vehicles.