Compare
SignUnder against each alternative, cell by cell, from each vendor’s own pages with the date we read them.
SignUnder and fal.ai's Content Credentials, compared
fal signs its hosted applications' output as fal, with an invisible watermark; API scope is undocumented. A supplier's mark, not yours. Read 12 Oct 2026.
Last reviewed 12 October 2026
SignUnder and Resemble AI's Watermarker, compared
Resemble signs C2PA records and detects SynthID, but is not on the conforming products list, so verifiers show Unrecognized. Read 12 Oct 2026.
Last reviewed 12 October 2026
SignUnder and SSL.com's C2PA certificates, compared
SSL.com issues the free Level 1 certificate a listed product needs, in your name. A CA, not a conformance service. Read 12 Oct 2026.
Last reviewed 12 October 2026
SignUnder and Trufo, compared
Trufo is a Trust List CA selling C2PA and CAWG certificates and managed signing in its own name; conformance is still yours to do. Read 12 Oct 2026.
Last reviewed 12 October 2026
SignUnder or do it yourself with c2pa-rs and TrustMark
Open source signs and watermarks well: c2pa-rs, TrustMark, PDQ, free listing and certificate. Left: paperwork, renewal, rules, detection. Read 12 Oct 2026.
Last reviewed 12 October 2026