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- Secucard S300 vs DIY
Excelsecu Secucard S300 vs SeedSigner DIY
What Secucard S300 does better (1) and where DIY wins (2) — every spec side by side.
2.6Open source5.9
Why is Secucard S300 better than DIY?
- Thickness1 mm vs 50 mm50×
Why is DIY better than Secucard S300?
- Open-source firmwareNo · Secucard S300: Yes
- Source code availableNo · Secucard S300: Yes
Specifications
Side by side
| Security | ||
| Secure Element chip | — | No |
| Air-gapped signing | — | Yes |
| 100% air-gapped | — | Yes |
| Supply-chain & tamper protection | — | Yes |
| Secure boot | — | No |
| Anti-klepto (anti-exfil) signing | — | No |
| Firmware & open source | ||
| Open-source firmware | No | Yes |
| Source code available | No | Yes |
| Reproducible builds | — | Yes |
| Firmware licence | — | MIT |
| Upgradable firmware | — | Yes |
| Firmware update via | — | microSD |
| Bitcoin-only firmware / edition | — | Yes |
| Device lock | ||
| PIN lock | — | No |
| PIN entered on the device | — | No |
| Fingerprint unlock | — | No |
| Duress PIN / decoy wallet | — | No |
| Brick / wipe PIN | — | No |
| Wipe after failed attempts | — | No |
| Time-delayed unlock | — | No |
| Anti-phishing words | — | No |
| Keys & backup | ||
| BIP39 passphrase | — | Yes |
| Shamir backup (SLIP-39) | — | No |
| Seed XOR | — | No |
| BIP85 child seeds | — | Yes |
| 24-word seed | — | Yes |
| SeedQR backup | — | Yes |
| microSD backup | — | No |
| NFC backup card | — | No |
| User-added entropy (dice) | — | Yes |
| Stateless use (no stored keys) | — | Yes |
| Multiple seeds on one device | — | No |
| Bitcoin features | ||
| Multisig | — | Yes |
| Taproot | — | Yes |
| Message signing | — | Yes |
| Coin control | — | Yes |
| Own node connection | — | Yes |
| Tor support | — | Yes |
| Replace-by-fee | — | Yes |
| Silent Payments | — | Yes |
| Spending limits | — | No |
| Testnet | — | Yes |
| Supported assets | ||
| Altcoins & tokens | — | No |
| Bitcoin only | — | Yes |
| Connectivity | ||
| Signing connectivity | — | QR code, microSD |
| USB | — | No |
| USB-C | — | No |
| Bluetooth | — | No |
| NFC | — | No |
| QR code camera | — | Yes |
| Animated QR (UR) | — | Yes |
| microSD signing | — | Yes |
| Screen & input | ||
| Screen | — | Yes |
| Screen size | — | 1.3″ |
| Screen type | — | IPS LCD |
| Screen resolution | — | 240 × 240 |
| Touchscreen | — | No |
| Colour screen | — | Yes |
| Gorilla Glass | — | No |
| Controls | — | Buttons |
| QWERTY keyboard | — | No |
| Battery & power | ||
| Built-in battery | — | No |
| Wireless charging | — | No |
| Design | ||
| Weight | — | 150 g |
| Length | 86 mm | 190 mm |
| Width | 54 mm | 120 mm |
| Thickness | 1 mm | 50 mm |
| Materials | — | Plastic |
| Water / dust resistance | — | No |
| Several colours available | — | Yes |
| DIY build possible | — | Yes |
| Apps | ||
| Desktop app | — | No |
| Mobile app | — | No |
| Works with wallet apps | — | Bitcoin Safe, Zeus, Nunchuk, Cove, Electrum, Sparrow, Specter Desktop, Blockstream Green, BlueWallet, Bitcoin Keeper, Bull |
| Compatible third-party wallets | — | 11 |
| Other features | ||
| FIDO2 / U2F security key | — | No |
| Password manager | — | No |
