Kandy Records
Signal Lock app icon
Signal Lock by Kandy Records

Tune. Practice. Perform.

An iPhone musician's toolkit from Kandy Records. A free guitar tuner with chromatic mode, a metronome, and a setlist tool. One optional upgrade. No ads, no subscription, no account.

Coming Soon to the App StoreSee what's in Pro

Version 1.0 · iPhone · Requires iOS 16.6 or later

Signal Lock tuner in the Digital Dark look, showing an in-tune low E
Digital Dark · free
Signal Lock tuner in the Industrial Outlaw finish with a brass needle gauge
Industrial Outlaw · Pro
Signal Lock tuner in the Vintage Ivory finish
Vintage Ivory · Pro
Signal Lock drum machine with the eight practice grooves
Drum machine · Pro
Free

Your essential tools. Always free.

Tuner

Fast, accurate detection for every guitar string, down to drop-tuned low strings. Shows which string you're on and which way to turn, with haptic feedback that speeds up as you get close. Presets for Standard, Drop D, Drop C, Drop C#, Half Step Down, and Whole Step Down. Chromatic mode shows any note, including bass notes, without a string number. 440 Hz or 432 Hz reference. Works with the built-in mic or a guitar interface.

Metronome

40–240 BPM with a tap-tempo dial you can hit with your thumb. Time signatures 4/4, 3/4, 6/8, 2/4, 5/4, and 7/8. Six click sounds including kick, snare, and cowbell. Accented beat one, haptics on every beat, and it keeps playing with the screen locked.

Setlist mode

Save a tempo and time signature for every song in the set. Tap or swipe to the next song between numbers and the metronome switches instantly. Unlimited songs, edit on the fly.

Two free looks

Digital Dark and Digital Light: high-contrast originals built for dark stages and daylight.

Signal Lock Pro

$2.99. One time. That's it.

No subscription · No ads

Unlock once and keep it. Pro adds two premium instrument finishes and the drum machine. The free tuner, metronome, and setlist stay free.

Pro

Industrial Outlaw

A dark premium instrument finish: brass gauges, needle dial, riveted panels.

Pro

Vintage Ivory

A light premium instrument finish in the same brass-and-needle style.

Pro

Drum machine

Eight practice grooves: Rock, Half-Time, Four Floor, Punk, Metal 16ths, Shuffle, Waltz, and 6/8. Same tempo controls as the metronome.

Purchased through Apple's App Store. Restore Purchases is built in for a new phone or a reinstall. Price shown in US dollars; your local App Store sets the price in other regions.

Privacy

Your sound stays yours.

The microphone is used only to hear your instrument while the tuner is open, and audio is never recorded or sent anywhere. Settings and setlists are saved on your phone. No analytics, no tracking, no third-party code.

Support

Something not working?

Tuner not hearing you, metronome silent, Pro not showing up after a reinstall: the support page covers the common fixes, and a human reads the inbox.

Coming Soon to the App Store