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  3. KISS Signer DIY vs Cosmos

DIYbitcoin KISS Signer DIY vs OPOLO Cosmos

What KISS Signer DIY does better (1) and where Cosmos wins (0) — every spec side by side.

DIYbitcoin KISS Signer DIY
DIYbitcoin · 2026KISS Signer DIY
1 advantage
vs
OPOLO Cosmos
OPOLOCosmos
0 advantages≈ €200
7.4Open source3.3

Why is KISS Signer DIY better than Cosmos?

  1. Source code availableYes · Cosmos: No

Why is Cosmos better than KISS Signer DIY?

Cosmos has no measurable advantages in this pair.

Specifications

Side by side

DIYbitcoin KISS Signer DIYDIYbitcoin KISS Signer DIY
OPOLO CosmosOPOLO Cosmos≈ €200
Firmware & open source
Open-source firmwareNoNo
Source code availableYesNo
Reproducible buildsNo—
Upgradable firmwareYes—
Design
Weight—3 g
Length—89 mm
Width—66 mm
Thickness—9.5 mm

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