Pricing
These are the prices we intend to launch with, published early so you can judge whether Signunder is worth waiting for. You cannot buy yet, and we will not take payment until the signing API and your own-name path are both working.
Open source
Free
Run it yourself. Signing, watermarking and fingerprinting libraries for .NET, TypeScript and Python, used with your own certificate.
- Self-hosted, no usage limit
- Your own C2PA certificate
- Community support
Cloud Free
$0
For trying it, and for being marked before your own conformance listing comes through.
- 2,000 outputs a month
- Signed under Signunder’s certificate, with an identity assertion naming you — labelled as interim
- Public verification page
- The coverage checker
Growth
$149 a month
The main plan: your own name on every manifest, and the conformance work done for you.
- 25,000 outputs a month
- Own-name signing under your key once you are listed
- Guided C2PA conformance and certificate request
- Rule packs for every jurisdiction you ship to
- Verification and detection endpoints on your own subdomain
Business
$599 a month
For teams with auditors, procurement and volume.
- 250,000 outputs a month, plus video minutes
- Single sign-on and audit log
- Exportable compliance evidence pack
- Priority support
Larger deployments
Above the Business plan we expect two shapes: a Scale plan from $2,000 a month for high volume, hardware-isolated key custody and a custom domain, and a self-hosted deployment inside your own cloud and key store, from $25,000 a year. Both involve a conversation rather than a card.
Prices in US dollars, excluding VAT. An output is one signed image, audio file or video. Published 8 October 2026 and subject to change before launch.