- How it works
- Forward a document to the service and type 'I sign this document' — your email provider's existing DKIM signature becomes the proof of signing, bundled into one self-contained file anyone can verify offline in a browser.
- What's different
- No third-party signing company is trusted with the signature — the proof relies entirely on infrastructure (DKIM) that already exists and would still verify even if this service disappeared.
- Pricing
- 4 free signatures, then $0.25 per document, no subscription. Open source (Apache-2.0) — self-host or use the hosted version.
- Best for
- People who need a lightweight, verifiable e-signature for occasional documents without paying for a full e-signature platform subscription.
- Watch out
- The provider states it never holds a signing key and can't forge or alter documents — that's the product's own security claim, not independently audited.