CarSweep

Does your audio system sound muddy, boomy, or just not right? CarSweep measures the actual frequency response of your system and tells you exactly how to adjust the equalizer, right from your iPhone. WHY CARS SOUND DIFFERENT THAN EXPECTED A car interior is anything but acoustically neutral. Seats absorb high frequencies, windows reflect sound, and the small cabin builds up bass unevenly. The result: factory equalizers often sound boomy or dull, even though the system itself is perfectly capable. HOW IT WORKS The app plays a test tone through your car's speakers over Bluetooth and records the result with the microphone. From that recording, CarSweep calculates the actual frequency response at your listening position and derives concrete correction values. Everything runs on the device, no data ever leaves your iPhone. EZ TUNING - FOR EVERYONE A guided flow in just a few steps: set the level, take a reference measurement, then measure bass, mids, and treble individually. Instead of a curve to interpret, you get clear instructions like "reduce bass on the stereo by 2." Perfect if your sound feels off but you don't know why. EXPERT MODE - FOR ENTHUSIASTS Full control over the measurement: frequency response chart, target curve, metrics like delay, SNR, and RMS deviation, plus an automatic suggestion for parametric or fixed-band EQ, exportable as a JSON preset. Also supports external measurement microphones like the miniDSP UMIK-1, including calibration files. FEATURES AT A GLANCE - Guided EZ Tuning for beginners, no experience needed - Expert mode with full sweep, frequency response, and EQ suggestion - Support for external measurement microphones (e.g. UMIK-1) - EQ export as JSON - History of all measurements, always available - Fully offline, no accounts, no ads, no analytics trackers - Available in English and German CARSWEEP PREMIUM (one-time purchase) The free version reliably measures from 100 Hz to 10 kHz. Premium extends the measurement range to 32 Hz to 16 kHz, covering exactly the range where subwoofer output, cabin gain, and bass buildup happen in a car. Premium also unlocks support for external measurement microphones and microphone calibration files. Pay once, unlocked for good, no subscription. Whether you just want to know why your car sounds off, or you're a car audio enthusiast who already owns a measurement microphone: CarSweep gives you the tools to improve your sound based on real measurements instead of guessing by ear.