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The Best Open-Source Alternatives to Signable

Are you looking for a free or self-hosted alternative to Signable? In 2026, avoiding expensive proprietary software subscriptions is easier than ever. The open-source community has built excellent privacy-friendly tools within the E-Signatures ecosystem. Currently, there are 7 active replacements available, with cosign being one of the most prominent selections.

Quick Comparison: Signable vs. Open Source

Full comparison: Signable vs. cosign →
CriteriaSignableOSS Replacements
Pricing modelPaid / Monthly Fees100% Free / Self-Hosted
Data ControlThird-party ServersFull Ownership & Privacy
CustomizabilityRestricted by VendorUnlimited (Modify Codebase)

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Apache-2.0

Cosign is an open-source project for signing and verifying container images and other artifacts, ensuring the integrity and authenticity of software dependencies, while prioritizing user privacy and control over proprietary solutions like Signable. By providing a secure, decentralized, and flexible signing solution, Cosign empowers developers to maintain trust and transparency in their software supply chain.

⭐ 6,166 Stars
šŸ“ 774 Forks
ā— 0 Open Issues
šŸ·ļø Apache-2.0
Apache-2.0

Notary is an open-source tool that enables trusted, tamper-evident signing and verification of digital content, providing an audit trail and non-repudiation guarantees for sensitive information. This decentralized alternative to Signable allows developers to maintain control over their digital signatures, ensuring privacy and compliance with regulatory requirements.

⭐ 3,286 Stars
šŸ“ 521 Forks
ā— 0 Open Issues
šŸ·ļø Apache-2.0
NOASSERTION

Slsa is an open-source tool that enables secure and private digital signatures, offering a customizable and transparent alternative to commercial services like Signable, without compromising on reliability or scalability. By leveraging Slsa, users can maintain full control over their data while achieving the same level of authentication and verification as commercial solutions.

⭐ 1,896 Stars
šŸ“ 286 Forks
ā— 0 Open Issues
šŸ·ļø NOASSERTION
Apache-2.0

TUF (The Update Framework) is an open-source, cryptographic framework for secure software updates that protects against tampering, ensures authenticity, and preserves user privacy, making it an ideal alternative to proprietary signature services like Signable. This framework empowers developers to manage and sign software updates while safeguarding user anonymity and data confidentiality.

⭐ 1,720 Stars
šŸ“ 295 Forks
ā— 0 Open Issues
šŸ·ļø Apache-2.0
Apache-2.0

Sigstore is an open-source, privacy-centric platform for secure software supply chain management, enabling the creation, verification, and validation of software integrity with cryptographic signatures while protecting user data. By offering a decentralized, open-standard approach, Sigstore serves as a secure alternative to centralized solutions like Signable, empowering developers to maintain control over their software's authenticity.

⭐ 532 Stars
šŸ“ 156 Forks
ā— 0 Open Issues
šŸ·ļø Apache-2.0
NOASSERTION

OpenTimestamps is a decentralized timestamping service that securely records the creation or modification time of digital documents, providing a cryptographically verifiable proof of their integrity and authenticity, without compromising user data. By serving as an open-source, community-driven alternative to commercial platforms like Signable, users can achieve timestamping that prioritizes transparency, security, and confidentiality, free from vendor lock-in.

⭐ 408 Stars
šŸ“ 117 Forks
ā— 0 Open Issues
šŸ·ļø NOASSERTION
Apache-2.0

OpenEEW is an open-source, self-hosted platform for electronic signing and document verification, offering a privacy-friendly alternative to Signable by allowing users to manage their own sensitive documents and signatures in-house without vendor lock-in. It provides a scalable, customizable solution for businesses and organizations seeking to maintain control over their digital signing processes while ensuring compliance with data protection regulations.

⭐ 208 Stars
šŸ“ 40 Forks
ā— 0 Open Issues
šŸ·ļø Apache-2.0

Frequently Asked Questions

What is the best open source alternative to Signable?

Based on GitHub community data (including star count and fork activity), cosign stands out as one of the most reliable open-source replacements for Signable today.

Why should I use an open-source replacement instead of Signable?

Switching to an open-source solution ensures complete data sovereignty, protects your software environment from sudden vendor price hikes, and gives you full transparent control over your tech-stack metadata.