Compare

Keystone 3 Pro or Ledger Flex?

The exact editions, side by side: how you’ll use them and the limits to know.

Keystone 3 Pro

Change wallet: Keystone 3 Pro

Ledger Flex

One edition

Change wallet: Ledger Flex
Add a wallet

In short

Transaction approval confirmed (iPhone): Keystone 3 Pro and Ledger Flex.

Approve transactions

Computer
Keystone 3 Pro:
QROKX Wallet · Bitcoin / Ethereum
USBRabby Wallet · Ethereum

Computer · OKX Wallet · QR · Bitcoin / EthereumSupport for wallet setup is unconfirmed

Computer · Rabby Wallet · USB · EthereumSupport for wallet setup is unconfirmed

Ledger Flex:
USBLedger Wallet · Bitcoin / Ethereum
iPhone
Keystone 3 Pro:
QROKX Wallet · Bitcoin / EthereumFirmware updates need a computer

iPhone · OKX Wallet · QR · Bitcoin / EthereumSupport for wallet setup is unconfirmed

Ledger Flex:
BluetoothLedger Wallet · Bitcoin / Ethereum
Android
Keystone 3 Pro:
QROKX Wallet · Bitcoin / EthereumFirmware updates need a computer

Android · OKX Wallet · QR · Bitcoin / EthereumSupport for wallet setup is unconfirmed

Ledger Flex:
USB · BluetoothLedger Wallet · Bitcoin / Ethereum

What they have in common

Cryptocurrencies
Multiple cryptocurrencies
Both
Controls / Display
Touchscreen
Both
Wallet recovery
Recovery phrase
Both
Battery
Rechargeable
Both

Before you choose

Consider
Keystone 3 ProCheck the app, asset and firmware together. USB signing is documented for specific integrations; firmware updates use a computer.
Ledger FlexiPhone connects by Bluetooth. Android connects by USB or Bluetooth. NFC does not replace USB or Bluetooth for ordinary transactions. Cryptocurrency support depends on the app.

Apps and requirements

Show detailsHide details
Connectivity
Keystone 3 Pro

Computer

OKX WalletQRBitcoin / EthereumSupport for wallet setup is unconfirmed
Connection requirements

Create or import the wallet on Keystone before connecting OKX Wallet. QR association needs Multi-Coin 0.9.0 or later for the phone app, or 1.2.6 or later for the browser extension. Firmware updates use a computer; device verification may also need one.

Rabby WalletUSBEthereumSupport for wallet setup is unconfirmed
Connection requirements

For Ethereum signing with the Rabby browser extension on a computer, use an already configured Keystone with Multi-Coin firmware 1.1.4 or later. Approve USB access on the device and keep it unlocked on its home screen. This route does not confirm initial setup. Supported desktop operating systems and minimum versions remain unconfirmed.

iPhone · Android

OKX WalletQRBitcoin / EthereumFirmware updates need a computerSupport for wallet setup is unconfirmed
Connection requirements

Create or import the wallet on Keystone before connecting OKX Wallet. QR association needs Multi-Coin 0.9.0 or later for the phone app, or 1.2.6 or later for the browser extension. Firmware updates use a computer; device verification may also need one.

Ledger Flex

Computer

Ledger WalletUSBBitcoin / EthereumWindows · macOS · Linux

iPhone

Ledger WalletBluetoothBitcoin / Ethereum

Android

Ledger WalletUSB · BluetoothBitcoin / Ethereum
Hardware detailsDifferent: 5 · Same: 1 · Not fully recorded: 17Show details (23)Hide details
Keystone 3 ProLedger Flex

Display

Display type
Keystone 3 Pro:LCD
Ledger Flex:E Ink
Screen diagonal
Keystone 3 Pro:4″
Ledger Flex:2.8″
Resolution
Keystone 3 Pro:480 × 800 px
Ledger Flex:480 × 600 px
Colour mode
Keystone 3 Pro:Not recorded
Ledger Flex:Grayscale
Shades of grey
Keystone 3 Pro:Not recorded
Ledger Flex:16

Size and weight

Dimensions
Keystone 3 Pro:62.44 × 103.9 × 12.08 mmDimensions as listed by the manufacturer
Ledger Flex:78.4 × 56.5 × 7.7 mmDimensions as listed by the manufacturer
Device weight
Keystone 3 Pro:103 g
Ledger Flex:57.5 g

Power and charging

Battery chemistry
Keystone 3 Pro:Lithium-ion
Ledger Flex:Not recorded
Battery capacity
Keystone 3 Pro:1,000 mAh
Ledger Flex:Not recorded
Battery energy
Keystone 3 Pro:3.7 Wh
Ledger Flex:Not recorded
Compatible USB charging input
Keystone 3 Pro:5 V / 1 A
Ledger Flex:Not recorded
Charging methods
USB-CBoth
Battery life
Keystone 3 Pro:Not recorded
Ledger Flex:Up to 10 hrUsage conditions not stated
Wireless charging
Keystone 3 Pro:Not recorded
Ledger Flex:Not supported

Materials and finish

Materials
Keystone 3 Pro:PC/ABS
Ledger Flex:Not recorded

Device connections

Memory card slot
Keystone 3 Pro:microSD
Ledger Flex:Not recorded
USB port
Keystone 3 Pro:Not recorded
Ledger Flex:USB-C
Bluetooth version
Keystone 3 Pro:Not recorded
Ledger Flex:5.2
NFC functions
Keystone 3 Pro:Not recorded
Ledger Flex:Ledger Recovery Key · Ledger Security Key

Memory

Storage space
Keystone 3 Pro:Not recorded
Ledger Flex:1.5 MB

Security and software

Security chip
Keystone 3 Pro:Not recorded
Ledger Flex:ST33K1M5 · CC EAL6+
Device software
Keystone 3 Pro:Not recorded
Ledger Flex:Ledger OS

Key dates

Released
Keystone 3 Pro:Not recorded
Ledger Flex:July 26, 2024

Official stores

Next steps
Keystone 3 ProMulti-coin firmware

Documentation checked Oct 16, 2026

Ledger FlexOne edition

Documentation checked Oct 6, 2026

Replace Keystone 3 Pro

Our picks

Current wallets

Discontinued