How to Connect a MIDI Keyboard to Your Phone

To connect a MIDI keyboard to your phone, plug a class-compliant USB controller into your phone with the right USB-C (or Lightning) cable or adapter, open a music app, and select the keyboard as the MIDI input. Bluetooth MIDI keyboards pair through your app or system settings instead of a cable. If the keyboard does not power up, you usually need a powered USB hub. Here is the full process for both iPhone and Android.

What you need first

Before you can connect a MIDI keyboard to your phone, gather:

• A class-compliant USB MIDI keyboard (most modern Akai and Korg controllers qualify) or a Bluetooth MIDI keyboard.
• The correct cable or adapter for your phone’s port — USB-C on newer phones, Lightning on older iPhones.
• A music app that accepts MIDI, such as GarageBand or Cubasis on iOS, or FL Studio Mobile and BandLab on either platform.

Connecting over USB

On iPhone and iPad (iOS/iPadOS)

1. Connect your controller’s USB cable to a USB-C or Lightning adapter, then into the phone.
2. Open your music app. Many apps detect the controller automatically.
3. If asked, allow the app to use the connected accessory, then play a key to test.

On Android

1. Use a USB-C cable or an OTG (On-The-Go) adapter to connect the controller.
2. Open a MIDI-capable app like FL Studio Mobile, BandLab or n-Track Studio.
3. If your phone prompts you, confirm the USB connection is set to allow the accessory, then test a key.

Android MIDI support is more variable than iOS, so stick to apps known to handle external controllers well. Our overview of making music on Android lists reliable options.

The power problem (and how to fix it)

This is the single most common reason a keyboard “won’t connect.” Phones supply limited USB power, and a bus-powered controller can draw more than the phone gives. If the keyboard’s lights stay dark or it keeps dropping out:

• Use a powered USB hub — plug the hub into power, the keyboard into the hub, and the hub into your phone.
• On iPhone, a Lightning-to-USB adapter with a separate power input does the same job.
• Avoid cheap, unpowered adapters with power-hungry controllers.

If you are building out a travel rig, our guide to accessories for mobile music production covers hubs and adapters worth owning.

Connecting over Bluetooth

Some controllers support Bluetooth MIDI, which skips cables entirely. The pairing happens inside a Bluetooth MIDI screen — in many iOS apps you will find it under a MIDI or settings menu rather than the phone’s main Bluetooth list. On Android, support depends on the app and device. Bluetooth adds a little latency, so for tight playing a cable is still best.

Telling your app to listen

Connecting hardware is only half the job — the app has to route the controller to a sound. In most apps you:

1. Create or select an instrument track (a synth, piano or drum kit).
2. Make sure that track’s MIDI input is set to your controller or to “all.”
3. Play a key and watch for the on-screen keyboard or meters to respond.

To get the most out of those instruments, see what AUv3 apps are — they let you load far better synths and pianos than the stock sounds. For melodic instruments specifically, the best piano and keyboard apps pair well with a hardware controller.

Troubleshooting checklist

• Nothing happens — confirm the controller is class-compliant and the cable is data-capable, not charge-only.
• Keyboard powers on but no sound — check the track’s MIDI input and that an instrument is loaded.
• Drops out randomly — almost always a power issue; add a powered hub.
• Notes stick or lag — close background apps and prefer USB over Bluetooth for timing.

Frequently asked questions

Why won’t my MIDI keyboard turn on when plugged into my phone?

Your phone is probably not supplying enough power. Connect the controller through a powered USB hub or a powered adapter so it gets its own power instead of relying on the phone, and it should light up and stay connected.

Do I need a special app to use a MIDI keyboard on my phone?

You need an app that accepts MIDI input. GarageBand and Cubasis handle it on iOS, while FL Studio Mobile, BandLab and n-Track Studio work across platforms. Once the app sees the controller, you select it as the input for an instrument track.

Can I connect a MIDI keyboard to an Android phone?

Yes, using a USB-C cable or an OTG adapter and a MIDI-capable app. Android support varies by device and app, so use controllers and apps known to work, and add a powered hub if the keyboard needs more power than the phone provides.