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

Recorded differences: Cryptocurrencies.

Approve transactions

Computer
Keystone 3 Pro:
QRSparrow · BitcoinFirmware installation required

Computer · Sparrow · QR · BitcoinSupport for wallet setup is unconfirmed

Ledger Flex:
USBLedger Wallet · Bitcoin / Ethereum
iPhone
Keystone 3 Pro:
QRBlueWallet · BitcoinFirmware installation needs a computer

iPhone · BlueWallet · QR · BitcoinSupport for wallet setup is unconfirmed

Ledger Flex:
BluetoothLedger Wallet · Bitcoin / Ethereum
Android
Keystone 3 Pro:
QRBlueWallet · BitcoinFirmware installation needs a computer

Android · BlueWallet · QR · BitcoinSupport for wallet setup is unconfirmed

Ledger Flex:
USB · BluetoothLedger Wallet · Bitcoin / Ethereum

Where they differ

Cryptocurrencies
Keystone 3 Pro:Bitcoin-only
Ledger Flex:Multiple cryptocurrencies

What they have in common

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

SparrowQRBitcoinFirmware installation requiredSupport for wallet setup is unconfirmed
Connection requirements

Create or import the wallet on Keystone first. QR connection needs Bitcoin-Only 1.0.1-BTC or later, with Sparrow 1.8.5 or later on a computer or BlueWallet 6.6.2 or later on a phone. Installing or updating firmware uses a computer.

iPhone · Android

BlueWalletQRBitcoinFirmware installation needs a computerSupport for wallet setup is unconfirmed
Connection requirements

Create or import the wallet on Keystone first. QR connection needs Bitcoin-Only 1.0.1-BTC or later, with Sparrow 1.8.5 or later on a computer or BlueWallet 6.6.2 or later on a phone. Installing or updating firmware uses a computer.

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 ProBitcoin-only firmware

Documentation checked Oct 16, 2026

Ledger FlexOne edition

Documentation checked Oct 6, 2026

Replace Keystone 3 Pro

Our picks

Current wallets

Discontinued