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A music toolkit that listens. It finds a song's key, tempo and chords, and has 28 tools for playing and practicing: tuner, metronome, drone, chord charts, songbook, improvisation coach, ear training and more. See all tools.

It's free, with no ads and no account.

iPhone, iPad, Android, and in a web browser at app.notecurrent.com.

Open Tools › Detect key, tap Start listening and play the song near your device. The key updates live; most songs settle within about 20 seconds. Tap Done to finish early.

How closely the notes in the song fit that key. “Strong match” means it's clear-cut. A lower match means the song sits between keys, borrows chords or changes key, so check the alternatives.

A major key and its relative minor (C major and A minor, for example) use the same notes. Which one is “home” depends on where the song rests. NoteCurrent picks the likelier one and shows the other.

Play the music louder and closer to the device, avoid talking over it, and let it listen through a chorus. Songs with heavy drums and little harmony, or that change key, are harder.

On iPhone and Android, NoteCurrent sends a short audio fingerprint (not the audio) to Apple's Shazam service. You can turn this off in Settings › Identify songs with Shazam. The web app doesn't identify songs.

Phones don't let apps hear other apps' audio. Play the song on another device or speaker, or out loud from this one.

Not yet.

Check that the microphone is allowed:

• iPhone and iPad: Settings › NoteCurrent › Microphone.
• Android: Settings › Apps › NoteCurrent › Permissions › Microphone.
• Web: click the lock or site-settings icon in the address bar and allow the microphone, then reload.

Detect key, Chord finder, Tuner, Whistle to notes, Practice a scale and Sing the note, only while their screen is open and listening.

Tap the star on any tool. Pinned tools appear under Favorites at the top of Tools; long-press and drag to reorder.

Settings › Color theme: Neon, Sunset, Ocean or Forest. Appearance switches between dark, light and your system setting.

Turn up the media volume and check that the phone isn't in silent mode (iPhone ring/silent switch).

In your Library, on your device only. Turn off Settings › Save every result automatically to save only the ones you choose.

Settings › Delete all saved results. Deleting the app removes all its data too.

There's no account or cloud sync, so the Library stays on the device where you made it.