This is the highly recommended and praised Function Generator App - an amazingly great and powerful tone generator. Enriched with a vast amount of features yet it is extremely intuitive and designed for simplicity.

Get to know this great App now! It is very well maintained and has received considerable upgrades over the past years.

So, … what can you do with this App?

• PLAY TEST TONES Sine, Rectangular, Triangular and Sawtooth.

• PLAY FREQUENCY SWEEP TEST TONES in both directions (minimum to maximum frequency and maximum to minimum frequency).

• PLAY VOLUME SWEEPS (from minimum to maximum volume).

• Try the SWEEP REPEAT / WOBBLE function.



• Or create your own CUSTOM PRESETS!

• And SAVE an endless amount of CONFIGURATIONS (Frequency, Sweep, Noise) for later quick access and direct playback function.

• Even play back different kinds of NOISE – White, Pink, Violet, Grey, Brown, Blue is also supported.

The Function Generator is AMAZINGLY INTUITIVE and SIMPLE!

=> Extending The Frequency Range
=> Extending The Sweep Times
=> Changing Min/Max Slider Frequency Ranges
=> Changing Max Sweep Time Slider Range
=> Changing Signal Amplitude
=> Enabling Of The Sweep Repeat / Wobble Function
=> Frequency Slider Setting to Linear or Logarithmic
=> Left/Right Channel Individual Selection
=> Permanently Saving Custom Presets
=> Saving Of Endless Number Of Audio Configurations
=> Phase Out Setting (custom phase shift of the generated signal)
=> BPM (Beats per Minute) Feature
=> Dual Function Generator
=> MultiTone Generator (playback of up to eight individual tones)
=> Background Theme Selection (Light/Dark)

Check out the new Tutorial page:

What’s New

Version 6.0.0

• added support for the Apple Watch. Supports running without iOS App installation
• fixed memory leak in the Sweep repeat implementation
• repeat button in the Sweep tab now has 3 functions: off, repeat, siren-mode
• improved Dual Tone Generator UI
• refactoring Master Volume control

Ratings and Reviews

4.9 out of 5
110 Ratings

110 Ratings


Outstanding App!

The details and options of controlling sound waves is more than you could ask for in a iOS app! It’s pure mathematics in your hand... and ears! Although I have many technical/scientific uses for it, I like to set up a deep-bass, oscillation, multiphase-waveform as I lay on a couch with a subwoofer underneath - a fully customizable back massage... the ultimate no-contact TENS device! Thank you to the developer for keeping it up all these years!

zambot ,

Panning function?

Great app, good quality sound and array of functions and uses. I have a request: can you add a panning function? That is, make it possible to pan between left and right on tones and during sweeps?

ZaetH33 ,

Best bang for the buck, 2nd only to...

Tom Gruber’s other application Multitone Pro. All his applications are phenomenal though; especially the EE Toolkit!

The only suggestions I have are to enable ping-pong sweeps in the Multitone windows and to allow sweeping of the noise/adding noise in the Multitone sweep (with a sweeping bandpass filter).

App Privacy

The developer, Thomas Gruber, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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