Compare

KeepKey, BitBox02 Nova or Ledger Flex?

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

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In short

Transaction approval (iPhone) is confirmed only for BitBox02 Nova and Ledger Flex.

KeepKeyOne edition

Price at KeepKey

BitBox02 NovaMulti-coin edition

Price at BitBox

Choose this edition at the store.

Ledger FlexOne edition

Price at Ledger

KeepKey

NovaMultiple cryptocurrencies

Approve transactions

Computer: KeepKey:
USBKeepKey Desktop · Bitcoin / Ethereum; BitBox02 Nova:
USBBitBoxApp · Bitcoin / Ethereum; Ledger Flex:
USBLedger Wallet · Bitcoin / Ethereum
iPhone: KeepKey:
Support for signing is unconfirmed; BitBox02 Nova:
BluetoothBitBoxApp · Bitcoin / EthereumMust stay plugged in; Ledger Flex:
BluetoothLedger Wallet · Bitcoin / Ethereum
Android: KeepKey:
Support for signing is unconfirmed; BitBox02 Nova:
USBBitBoxApp · Bitcoin / EthereumPhone needs USB OTG; Ledger Flex:
USB · BluetoothLedger Wallet · Bitcoin / Ethereum

Where they differ

Controls / Display: KeepKey:Physical buttonsDisplay: Display without touch input; BitBox02 Nova:Touch sensorsDisplay: Display without touch input; Ledger Flex:Touchscreen
Wallet recovery: KeepKey:Recovery phrase; BitBox02 Nova:microSD backup and recovery phrase; Ledger Flex:Recovery phrase

What they have in common

Cryptocurrencies: Multiple cryptocurrencies
All three

Not fully confirmed

Operating power: KeepKey:USB power; BitBox02 Nova:USB power; Ledger Flex:Not recorded
Battery: KeepKey:Not recorded; BitBox02 Nova:Not recorded; Ledger Flex:Rechargeable

Before you choose

Consider

KeepKeyKeepKey’s current phone instructions don’t clearly explain how to send a transaction to the device for approval. For Bluetooth signing from your phone, compare Flex.

BitBox02 NovaOn iPhone and iPad, Bluetooth carries the data but the wallet still needs a physical power connection. You control it by touching its edges, not the screen. BitBoxApp on iPhone and iPad guides firmware updates when a compatible version is offered.

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

KeepKey

Computer

KeepKey DesktopUSBBitcoin / EthereumWindows · macOS · Linux

BitBox02 Nova

Computer

BitBoxAppUSBBitcoin / EthereumWindows · macOS · Linux

Connection requirements

Ethereum requires the Multi edition. A Bitcoin-only hardware edition cannot be converted to Multi.

iPhone

BitBoxAppBluetoothBitcoin / EthereumMust stay plugged in

Connection requirements

With an iPhone, plug BitBox02 Nova into the phone or another suitable power source. It uses Bluetooth to exchange data. Ethereum needs the Multi edition; the Bitcoin-only edition cannot be changed to Multi.

Android

BitBoxAppUSBBitcoin / EthereumPhone needs USB OTG

Connection requirements

Your Android phone needs USB OTG support to connect to Nova over USB. Ethereum requires the Multi edition; a Bitcoin-only device cannot be changed to Multi.

Ledger Flex

Computer

Ledger WalletUSBBitcoin / EthereumWindows · macOS · Linux

iPhone

Ledger WalletBluetoothBitcoin / Ethereum

Android

Ledger WalletUSB · BluetoothBitcoin / Ethereum

Hardware detailsDifferent: 3 · Same: 0 · Not fully recorded: 19Show details (22)Hide details

KeepKeyBitBox02 NovaLedger Flex

Display

Display type: KeepKey:OLED; BitBox02 Nova:OLED; Ledger Flex:E Ink
Resolution: KeepKey:256 × 64 px; BitBox02 Nova:128 × 64 px; Ledger Flex:480 × 600 px
Colour mode: KeepKey:Not recorded; BitBox02 Nova:Monochrome; Ledger Flex:Grayscale
Screen diagonal: KeepKey:Not recorded; BitBox02 Nova:Not recorded; Ledger Flex:2.8″
Shades of grey: KeepKey:Not recorded; BitBox02 Nova:Not recorded; Ledger Flex:16

Power and charging

Battery life: KeepKey:Not recorded; BitBox02 Nova:Not recorded; Ledger Flex:Up to 10 hrUsage conditions not stated
Charging methods: KeepKey:Not recorded; BitBox02 Nova:Not recorded; Ledger Flex:USB-C
Wireless charging: KeepKey:Not recorded; BitBox02 Nova:Not recorded; Ledger Flex:Not supported

Materials and finish

Materials: KeepKey:Body: Aluminium; BitBox02 Nova:Not recorded; Ledger Flex:Not recorded

Security and software

Security chip: KeepKey:No Secure Element; BitBox02 Nova:OPTIGA Trust M V3; Ledger Flex:ST33K1M5 · CC EAL6+
Device software: KeepKey:Not recorded; BitBox02 Nova:Not recorded; Ledger Flex:Ledger OS

Processor

Controllers: KeepKey:Sources disagree; BitBox02 Nova:ATSAMD51J20A · DA14531; Ledger Flex:Not recorded
Core and clock speed: KeepKey:Not recorded; BitBox02 Nova:Cortex-M4F · 120 MHz; Ledger Flex:Not recorded

Size and weight

Dimensions: KeepKey:Not recorded; BitBox02 Nova:54.5 × 25.4 × 9.6 mmDimensions as listed by the manufacturer · Includes the connector; Ledger Flex:78.4 × 56.5 × 7.7 mmDimensions as listed by the manufacturer
Device weight: KeepKey:Not recorded; BitBox02 Nova:13 g; Ledger Flex:57.5 g

Device connections

USB port: KeepKey:Not recorded; BitBox02 Nova:USB-C; Ledger Flex:USB-C
Memory card slot: KeepKey:Not recorded; BitBox02 Nova:microSD; Ledger Flex:Not recorded
Bluetooth version: KeepKey:Not recorded; BitBox02 Nova:Not recorded; Ledger Flex:5.2
NFC functions: KeepKey:Not recorded; BitBox02 Nova:Not recorded; Ledger Flex:Ledger Recovery Key · Ledger Security Key

Key dates

Announced: KeepKey:Not recorded; BitBox02 Nova:June 20, 2025; Ledger Flex:Not recorded
Released: KeepKey:Not recorded; BitBox02 Nova:Not recorded; Ledger Flex:July 26, 2024