Blue Box app icon

Apps Like Blue Box for iPhone and iPad

Encode and decode DTMF touch tones.

The app encodes and decodes DTMF signals. Users can generate tones using a keypad or decipher tones via the microphone.

by Sunshine Valley Systems★ 5.03 ratingsUtilities$4.99Data updated 2026-09-16
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Ranked alternatives

Showing 541–560 of 1,000 ranked alternatives.

  10. SoundScope: Audio Toolkit app icon

    SoundScope: Audio Toolkit

    ROBERT PRICE

    Measure sound, analyze frequencies, record

    Measure and analyze sound with real-time decibel readings and color-coded safety indicators. Track minimum, maximum, and average levels. Save measurements with location and notes. Receive warnings at dangerous sound levels.

    ★ 0.00 ratingsUtilitiesFreeData updated 2026-09-06
    App details
  11. Oscillator app icon

    Oscillator

    正行 Akamatsu

    Generate tones and test audio waves

    Udio tones with four waveforms: sine, square, saw, and white noise. Adjust frequency using a slider or numeric input. Control amplitude with a dB-style slider. Pan sound left or right with a slider. Toggle sound output on or off.

    ★ 3.73 ratingsMusic$0.99Data updated 2026-09-08
    App details

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