Unlike virtually all of the other signal tone generators apps on the AppStore, this one is truly free and doesn’t have a nag screen for subscriptions or spam you with ads. GUI/UX is smart and simple, and the app works as expected. Generates a proper sine wave that you can use to calibrate equipment. I verified the accuracy of the signal test tones being generated with a chromatic tuner. They are 100% spot on. if I had any complaint, it’s that this app hasn’t been updated in over two years, so it’s anyone’s guess if it will keep working with regular iPad OS updates. As of 16.5.1, it’s working fine. The only other improvement I’d ask for is to be able to directly type in frequencies. having to virtually spin a pot is irritating and archaic. but for free it’s hard to complain! Anyway, time to calibrate the speed on my old cassette deck.

I’m a musician, and this app has become one of my go-to tools. It’s not just another tone generator — it’s actually useful. The built-in keyboard that lets you hear each note and see its exact frequency is brilliant. It’s perfect for composing, tuning, referencing pitches, and reaching that low-end response — everything just works the way it should. Most tone apps feel like technical utilities. This one feels musical. The layout is clean, intuitive, and it reacts instantly. Whoever designed it clearly understands how musicians think and work.I have a request however door the developer. No, it’s a plea. If the frequency range could be extended to 10hz and I’d love to see a VST3 / AUv3 / desktop plugin version of this. It’d be a perfect addition to any DAW — not just for testing tones.This app is accurate, reliable, and free — easily the best tone generator I’ve found on mobile. Don’t change the formula; just give it a plugin version and it’s perfect. Please oh please.

This is the only app that I found that actually lets me type in the frequency with two decimal digits. I’ve tried several other apps that that show the decimals in the screenshot and none of them actually allowed me to type in a frequency that specific. This one is the only one that works as advertised. Honestly, I’d be happy to pay a fee to remove the ads and I wish that option would exist. Maybe in the future?

Thank you for making a wonderfully simple app available! Used it as a signal generator for my oscilloscope. Works beautifully!There are some significant high order oscillations in the square and saw-tooth waves, which become comparable with the signal at high frequency. Perhaps adding more terms to the series at high frequency would help? In any case, a great app!