Propper launches self-hosted eSignature platform for Nutrient customers

Propper AI has launched Sign Unlimited, a white-label eSignature platform for companies already using the Nutrient Document Engine. The product is available now and is designed to let enterprises add signing workflows, audit trails, and branding without building their own system.

Why it matters: - Nutrient customers can now add a production-ready signing layer without starting an eSignature build from scratch. - The platform targets enterprises that want full control over documents, data, branding, and deployment. - The offering is positioned to reduce time to launch, engineering effort, and usage-based signing fees.

What happened: - PropperDocs, Inc. (Propper AI) announced the general availability of Propper Sign Unlimited on September 29, 2026. - Sign Unlimited is built on the Nutrient Document Engine SDK and is aimed at customers already licensing Nutrient. - The platform is available now, and Propper says customers can be up and running in as little as 72 hours. - Nutrient customers procure their Nutrient Document Engine license directly from Nutrient.

The details: - Sign Unlimited includes signing workflows, audit trails, notifications, branding, and APIs. - The platform uses a single-tenant model and runs on infrastructure the customer controls. - Supported deployment options include AWS, Azure, GCP, private data centers, and hybrid environments. - The licensing model does not include per-envelope, per-user, or per-signature fees. - Propper says the one-time licensing model means cost per signature approaches zero as volume grows. - Customers keep documents and metadata inside their own environment. - The platform supports custom retention and deletion policies. - White-label features include custom domains such as sign.yourcompany.com, branded emails, a customizable signing ceremony, and multi-brand support. - The platform uses REST APIs for embedding signing into existing applications and workflows. - It is designed to connect with identity providers, audit systems, and existing security infrastructure. - The software runs on a standard Linux server with Docker and PostgreSQL. - Optional Redis caching and S3-compatible storage are supported. - Source code is available for purchase.

Between the lines: - Propper is trying to turn existing PDF infrastructure into a full agreement workflow product, which can lower the barrier for enterprises that already standardized on Nutrient. - The pitch emphasizes ownership and control over the subscription-style and per-envelope pricing common in the eSignature market. - Regulated industries and data-residency-heavy buyers are the clearest target because the product keeps data in the customer environment. - The company is also signaling that it wants to serve SaaS vendors that need embedded signing under their own brand.

What's next: - Propper is taking requests for licensing details and technical demos at Propper Sign Unlimited. - The company provides deployment documentation, software updates, security patches, and an optional enterprise support subscription. - Customers will still need to manage their own Nutrient licensing relationship separately.

The bottom line: - Propper is betting that Nutrient customers will pay for speed, control, and predictable economics rather than build an eSignature platform themselves.