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Sig Gen

iPhone / iPad
  • Utilities
  • Education
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Sig Gen is a dual-channel audio signal generator (aka function generator) for your iPhone or iPod Touch. It uses the audio output of your device to generate sine, square, triangle, and sawtooth waves. This is useful for all kinds of debugging applications involving home audio, hi-fi tube amplifiers, verifying the frequency response of high-end speakers, and annoying your friends with high-pitched tones. Basically anything you might need a audio frequency siggen or oscillator for.


+ Dual channels with independent amplitude, frequency, and waveform settings.
+ Generates usable signals up to 20kHz (44.1 kHz sample rate).
+ Save and recall up to 6 presets.
+ Lock amplitude and/or frequency sliders together.
+ Phase control allows adjustment of the relative phase between channels.
+ Frequency slider is log scale.
+ UI is responsive enough to use sliders in real-time.

Both channels can independently generate any of the following waveforms:

+ Sine wave
+ Square wave
+ Triangle wave
+ Sawtooth wave
+ Nothing

A note on amplitude:

With your device's volume control at maximum the amplitude settings in Sig Gen should roughly equate to the same measured peak-to-peak voltage (e.g. setting to amplitude to 1.0 should result in a measured 1.0 Vpp signal).

If you have any issues with this app drop us a line at A real person will be glad to answer your questions.