iPhone Screenshots


Tone Generator Ultra is a simple and easy-to-use test tone and frequency generator. Tones can be set by frequency or musical note.

-Sine, Square & Sawtooth Wave Generation
-Chromatic pitch detection from external sources
-Configurable A4 callibration
-White and pink noise
-Multi-tone generator
-Impulse wave
-Supports frequencies from 20Hz to 22kHz
-Logarithmic / linear sweep utility with
adjustable upper and lower frequencies
and delay

Tone Generators are very useful for a variety of tasks including:
- Balancing your Stereo or Home Cinema System
- Testing Speakers
- Acoustics testing
- White and Pink Noise Generator

Can be used inconjunction with PocketRTA Ultra Spectrum Analyzer for the iPhone.

Or for fun
- Compare your friends hearing, see who is straining to hear the sounds
- Annoy your best friend with that pesky sound.
- But definately not to be used to annoy your teachers.

What's New

Version 1.07

You can now use with an external Bluetooth Speaker.
Background audio is supported.

NOTE: Connect to the speaker prior to running the app. While connected to Bluetooth the input is disabled.

Ratings and Reviews

2.8 out of 5

6 Ratings

6 Ratings


nick i

Best frequency generator ever.
Let me start off by saying that I have used all of the tone gens and none of them do what this one does. Paid apps included. If you don't know audio this app could be a bit overwhelming at first but the UI is just so simple, I love it.

Seriously, I've used them all, I just wish you would expand the range down to 5 Hz. I know the current generation iDevice's DACs don't go up past 22,000 without immense amounts of drop off but it would be nice if you push that up to 30,000. After all when you get into great audio systems this is really what separates the boys from the men.
Best app ever! Highly reccommend! GET IT GET IT GET IT!

Doesn't keep playing in background


This app is worthless because it stops playing sound when you switch away from it, even with the "Keep Alive" setting enabled in the app. How am I supposed to switch to my RTA app to analyze the results of piping the tones through my PA if this app stops making sound when I switch away from it?!?



As a retired Broadcast Engineer, I can use this app along with my iPhone 5 as an audio frequency generator. With the appropriate audio cable plugged into my phone, I can do a freq run into my audio console (mixing board).
The app is very handy & convenient!


Limelight Software
3 MB
Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© Limelight Software Limited 4Pockets.com
In-App Purchases
  1. Unlock Tone Generator Ultra $1.99


  • Family Sharing

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

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