Signo review
A focused open-source API signer for Linux teams using hardware-backed keys.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Signo is an open-source, self-hosted Node.js service for teams that need API-driven code signing on a Linux machine. It supports plain file signing and Authenticode signing for Windows executables, making it suited to small teams automating signing workflows or incorporating hardware-backed keys into CI/CD processes. Administrators can manage multiple users and API signees while controlling access to the signing service through HMAC-signed API requests.
Its main distinction is the combination of HTTP signing and PKCS#11 support. Signo can detect and manage PKCS#11 tokens, expose hardware-token key and certificate information, and use configurable signing engines. The published configuration supports either SQLite or MySQL, while installation is available through npm or Docker. This gives teams a self-hosted deployment path with a focused feature set for connecting automated workflows to protected signing hardware.
Signo uses an open-source model rather than a tiered SaaS plan, so its appeal is strongest for teams prepared to operate the service themselves. It is a practical fit when Linux hosting, API access, HMAC authentication, PKCS#11 token management, and Authenticode signing cover the requirement. Teams seeking broader target coverage, a managed service, or a wider platform ecosystem should choose a product designed around those needs instead. Signo is most compelling when control over deployment and hardware-backed signing matter more than breadth.
Signo pros and cons
- Where it wins
- Signs files and Windows executables through an HTTP API
- Supports PKCS#11 token detection, management, and visibility
- Handles multiple users, API signees, and CI/CD signing workflows
- Where it doesn't
- Runs on Linux rather than offering broad platform coverage
- Requires self-hosting and operational ownership
- Signing support is focused on files and Windows executables
Signo fact sheet, pricing and score →
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