| Category | Winner | Why |
|---|---|---|
| Security Transparency | Trezor Safe 5 | Trezor Safe 5 runs fully open-source firmware — every cryptographic operation is auditable on GitHub. Ledger Flex uses closed-source firmware on its ST33K1M5 secure element, relying on Ledger's proprietary Clear Signing architecture where the secure element both parses and signs transactions. Both hold CC EAL6+ certification, but only Trezor lets independent researchers verify the code that handles private keys. |
| Display Quality | Ledger Flex | The Ledger Flex has a 2.84-inch E-Ink touchscreen at 600x480 resolution — nearly twice the diagonal of the Trezor Safe 5's 1.54-inch color display at 240x240. The Flex can show full transaction addresses without scrolling. The Safe 5 counters with a vibrant color screen under Gorilla Glass 3 and haptic feedback, which feels more responsive during interactions. E-Ink is readable in direct sunlight; the IPS LCD is better in low light. |
| Connectivity | Ledger Flex | The Ledger Flex offers USB-C, Bluetooth 5.2, and NFC — three connectivity options versus the Safe 5's USB-C only. Bluetooth enables wireless transaction signing from iOS and Android via Ledger Live without a cable. The Trezor Safe 5 has no wireless connectivity at all, requiring a USB-C connection for every signing operation. |
| Cryptocurrency Support | Trezor Safe 5 | Trezor supports 9,000+ cryptocurrencies versus Ledger's 5,500+. Trezor's open-source model enables community-contributed chain support without waiting for internal development. Both support Bitcoin, Ethereum, Solana, and all major EVM chains. Trezor Suite also allows adding any ERC-20 token by contract address. |
| Build Quality and Portability | Trezor Safe 5 | The Trezor Safe 5 weighs 23g and measures 65.9 x 40 x 8mm — less than half the weight of the 57.5g Ledger Flex at 78.4 x 56.5 x 7.7mm. The Safe 5's Gorilla Glass 3 display is chemically strengthened against scratches and cracks. The Flex is card-sized with an aluminum frame. Both are pocketable, but the Safe 5 disappears into a pocket more easily. |
| Battery and Power | Ledger Flex | The Ledger Flex has a 200 mAh Li-Po battery that lasts weeks on standby thanks to E-Ink's near-zero power draw when displaying static content. The Trezor Safe 5 has no battery and requires USB power for every interaction. If you want to sign a transaction on the go via Bluetooth without plugging in, only the Flex can do it. |
Data from PAM Finds