RTA Pro

RTA Pro transforms your phone into a professional audio spectrum analyzer — no external microphone required, but compatible with a calibrated measurement microphone (UMIK-1, iMM-6) if you have one.

WHAT YOU GET
• Real-time FFT curve, logarithmic or linear scale, with touch cursor and peak hold
• RTA view in octave bands (1/1, 1/3, 1/6) compliant with IEC 61260
• Full-screen spectrogram (waterfall) to visualize the evolution of sound over time
• A, C, and Z weightings (IEC 61672)
• Import of a micro calibration file (UMIK-1 / iMM-6 format) and manual dB SPL offset
• Built-in signal generator: sine wave, white noise, pink noise, 20 Hz–20 kHz logarithmic sweep — useful for testing a speaker or calibrating a room
• Export of the curve as an image (PNG) and data as a spreadsheet (CSV)
• Landscape and tablet mode, dark theme

DESIGNED FOR PRIVACY
• Works entirely offline — no internet connection required or used
• No account, No registration
• No ads, no trackers, no analytics
• Only one permission: the microphone, solely for the audio analysis you request

WHO IS IT FOR? Sound engineers, musicians, home studios, PA installers, or anyone curious to see what they hear. Imports UMIK-1/iMM-6 calibration data for serious acoustic measurements (room treatment, speaker alignment).

SCOPE OF THIS VERSION
No long-duration recording, no analysis of existing audio files, no RT60 or THD measurement in this version — these features are under consideration for a future update.