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Spektral is a professional real-time audio analyser for sound engineers. Ring out a PA, find the frequency that is howling, and keep an eye on the level in the room, all from your iPhone or iPad.

THREE VIEWS, ONE WORKFLOW
• RTA: live spectrum on a logarithmic frequency scale, 20Hz to 20kHz
• Spectrograph: scrolling time-frequency heatmap, where feedback shows as a persistent bright horizontal line
• SPL meter: A, C or Z weighted, Fast, Slow or Impulse, with the room's history behind it

RING-OUT
Spektral listens for a frequency that is building rather than one that is merely loud, so a bass note or a mains hum cannot set it off. When it finds one it names the frequency, gives you the musical note, and suggests the notch: centre frequency, Q and cut. Confirmed rings stay in a list as you work through them.

LEVEL AND LEQ
• Leq over 1 minute, 15 minutes, 30 minutes, 1 hour and 8 hours, all running at once
• Three hours of level history on one graph, with min, max and average
• Limit Guard: set a limit and a window, and Spektral forecasts how long you have before you reach it
• Calibrate against an acoustic calibrator when you need accurate absolute levels

PRECISION
• 4096-point FFT
• Parabolic interpolation for sub-bin cursor and peak accuracy
• Peak hold with smooth decay
• Smoothing from 1/24 octave through to 1/1
• Frame averaging up to infinite
• Musical note display on peaks and cursor

TOOLS
• Identify: labels the strongest peaks automatically, or just the single worst one
• Snapshot compare: freeze a trace and A/B against it
• Pink noise generator for reference output

TOUCH-OPTIMISED
• Horizontal pinch zooms the frequency axis, vertical pinch zooms the dB range
• Drag to pan when zoomed, tap to place the cursor
• Double-tap to reset all zoom and pan

DESIGNED FOR THE STAGE
• Full-screen dark interface for low-light environments
• Works in portrait and landscape
• Uses the built-in microphone or any connected audio interface

REMOTE MONITORING (optional in-app purchase)
Send this device's SPL readings to Spektral on your Mac over iCloud, so one engineer can watch several positions at once.

No subscriptions. No account required. The analyser runs entirely offline.