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Chordical: Guitar Tuner is a chromatic guitar tuner. Play a string and it shows the note, and how many cents sharp or flat it is, in real time. There is no account and nothing to sign in to.

The tuner asks for the microphone

The tuner needs the microphone to hear your guitar. Allow it when asked. The audio is analyzed on your device and is never recorded or uploaded.

If you said no before, turn the microphone back on in your device's settings:

• On iPhone and iPad, open Settings, find Chordical - Free Guitar Tuner in the list of apps, and turn on Microphone.
• On Android, open Settings, Apps, Chordical - Free Guitar Tuner, Permissions, and allow Microphone.

The needle does not move

Play one string at a time and let it ring. Hold the phone near the guitar's sound hole or amplifier, and check that the microphone permission is on.

Chordical - Sheet Music shows sheet music, plays it back, and listens while you play along. It has thousands of public domain pieces for piano, guitar, voice and drums. Play a piano piece on a MIDI keyboard and the app checks each note against the score. Play a guitar piece or sing a voice piece and it listens through the microphone. It runs on iPhone and iPad and on the web at sheetmusic.chordical.com. There is no account and nothing to sign in to.

Connect a Bluetooth MIDI keyboard

1. Open a piece.
2. Open Settings and choose the Practice tab.
3. In the Bluetooth MIDI section, wait for your keyboard to appear in the list, then press Connect.

The keyboard has to be ready to pair before it shows up in the list. On a Roland FP-90, hold the Bluetooth button until its light flashes. Other keyboards have a similar button or a menu setting: look for Bluetooth MIDI in the keyboard's manual. Once connected, the app remembers the keyboard and reconnects to it by itself.

A USB keyboard needs no pairing. Plug it in, open a piece, and allow MIDI access if asked.

Guitar and voice pieces ask for the microphone

A guitar or voice piece asks for the microphone the first time it listens, so the app can hear the notes you play or sing. Allow it when asked. If you said no before, open Settings on your iPhone or iPad, find the app in the list, and turn on Microphone. In a browser, allow the microphone for the site in the browser's site settings. The audio is analyzed on your device and is never recorded or uploaded.

None of the Chordical apps has an account, and nothing you play, sing or record is sent anywhere. The privacy policy has the details.

For help, bug reports or anything else, write to jasonlmcaffee@gmail.com.