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Coldcard MK4 vs Ledger Flex

Coldcard MK4
Overall Rating
Ledger Flex
Overall Rating
Visit Coldcard's Site
Visit Ledger's Site
Coldcard MK4 logo Visit Coldcard's Website Ledger Flex logo Visit Ledger's Website

Key differences

  1. Coldcard MK4 is Bitcoin-only with dual secure elements and air-gapped workflows; Ledger Flex supports 5,500+ assets with a large E Ink® touchscreen.
  2. Ledger Flex is easier for mobile users with Bluetooth and app integrations but costs more at $249 vs Coldcard's $167.94.
  3. Coldcard is built for advanced users needing full control and offline multisig; Ledger Flex suits users looking for sleek design and broad coin support.


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Price

Coldcard MK4

$167.94 USD

Buy Now →
Ledger Flex

$249 USD

Buy Now →

Launch

Coldcard MK4

2022

Ledger Flex

2024

Screen Size

Coldcard MK4

128x64 pixel OLED display

Ledger Flex

2.84” 16 grayscale E Ink® touchscreen

Box Includes

Coldcard MK4

  • COLDCARD™ Mk4

Ledger Flex

  • Ledger Flex hardware wallet
  • USB-C to USB-A cable
  • getting started leaflet
  • 3 recovery sheets
  • keychain strap

Ready to decide?
Coldcard MK4 Get Coldcard MK4 or Ledger Flex Get Ledger Flex

Security Features

Passphrase Support

Coldcard MK4

Ledger Flex

Passphrase Entry

Coldcard MK4

Device

Ledger Flex

Device or computer

PIN Protection

Coldcard MK4

Ledger Flex

Shamir Secret Sharing

Coldcard MK4

Ledger Flex

Tor Support

Coldcard MK4

Ledger Flex

Ready to decide?
Coldcard MK4 Get Coldcard MK4 or Ledger Flex Get Ledger Flex

Usage

Platforms

Coldcard MK4

  • Windows
  • macOS
  • Linux
  • Android
  • iOS

Ledger Flex

  • Windows
  • macOS
  • Linux
  • Android
  • iOS

Supported Coins

Coldcard MK4

Bitcoin Only

Ledger Flex

Manage 5,500+ coins and tokens, including Bitcoin, Ethereum and XRP, and install up to 100 apps.

Interfaces

Coldcard MK4

  • Numeric Keypad
  • NFC-V
  • USB-C
  • AirGap SneakerNET
  • Virtual Disk
  • MicroSD Card

Ledger Flex

USB-C, Bluetooth

Technical Details

Secure Elements

Coldcard MK4

Dual Secure Elements - ATECC608 & DS28C36B

Ledger Flex

CC EAL6+ Certified Secure Element

Open Source

Coldcard MK4


Firmware & Software

Ledger Flex


Software

FIDO Authentication

Coldcard MK4

Ledger Flex

Size

Coldcard MK4

86x50x7.5 mm (3.39x1.97x0.3 in)

Ledger Flex

78.4x56.5x7.7 mm (3.08x2.22x0.30 in)

Weight

Coldcard MK4

30g (1.1oz)

Ledger Flex

57.5g (2.0oz)

Bitcoin-Only Version

Coldcard MK4

Ledger Flex

Integration & Multisig

Integrations

Coldcard MK4

  • Nunchuk
  • Sparrow
  • Bitcoin Core
  • Electrum
  • BlueWallet
  • Casa
  • Fully Noded
  • Specter Desktop
  • Unchained
  • Wasabi Wallet
  • Coldcore
  • Theya

Ledger Flex

Multisig Support ?Multi-signature wallets require multiple keys to authorize transactions (e.g., 2-of-3). Adds security by eliminating single points of failure.

Coldcard MK4

Ledger Flex

Display Technology

Display Type

Coldcard MK4

Monochrome OLED (128x64)

Ledger Flex

E Ink (16 grayscale)

Touchscreen

Coldcard MK4

No (button controls)

Ledger Flex

Yes

Build Quality

Body Material

Coldcard MK4

Plastic with sliding protective cover

Ledger Flex

Aluminum frame + Gorilla Glass

Water Resistance ?IP67 rating means fully dustproof and can survive submersion in 1 meter of water for 30 minutes. Protects against accidental spills and drops.

Coldcard MK4

Not rated

Ledger Flex

Not rated

Haptic Feedback ?Vibration feedback when pressing buttons or confirming actions. Provides tactile confirmation that your input was registered.

Coldcard MK4

No

Ledger Flex

Yes

Connectivity & Power

Bluetooth ?Wireless connectivity for pairing with mobile devices. Enables cable-free transactions but some users prefer USB-only for security.

Coldcard MK4

No

Ledger Flex

Yes

NFC ?Near Field Communication for tap-to-connect with compatible devices. Convenient for quick mobile transactions.

Coldcard MK4

Yes

Ledger Flex

Yes

Wireless Charging

Coldcard MK4

No

Ledger Flex

No

Cable Type

Coldcard MK4

USB-C

Ledger Flex

USB-C to USB-A

Battery

Coldcard MK4

No battery (USB powered)

Ledger Flex

~10 hours / 150 transactions

Advanced Security

Quantum Ready ?Designed to receive firmware updates with quantum-resistant cryptography. Protects against future threats from quantum computers that could break current encryption.

Coldcard MK4

Yes

Ledger Flex

No

Dual Secure Element ?Uses two separate secure chips instead of one. Provides redundancy and additional tamper protection for storing your private keys.

Coldcard MK4

Yes (2 chips)

Ledger Flex

Single chip

iOS Compatibility ?"Full" means you can send, receive, and manage crypto on iPhone. "Limited" typically means view-only or requires desktop for transactions.

Coldcard MK4

Full support

Ledger Flex

Full support

Company Details

Parent Company

Coldcard MK4

Coinkite

Ledger Flex

Ledger

Parent Company Founded

Coldcard MK4

2011

Ledger Flex

2014

Security Incidents

Coldcard MK4

No known security incidents

Ledger Flex

No known security incidents

Ready to decide?
Coldcard MK4 Get Coldcard MK4 or Ledger Flex Get Ledger Flex

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