Sproof Sign

What Is Sproof Sign?

A procurement officer at a Salzburg law firm needed to get 14 signatures on a real estate contract — from parties spread across Austria, Germany, and Italy. The firm's previous workflow involved printing, posting, scanning, and chasing. DocuSign offered a digital alternative, but the qualified electronic signature requirement for Austrian real estate transfers disqualified it. The contract demanded QES under eIDAS, and DocuSign's qualified signature support in Europe was limited and expensive.

Sproof Sign solved that problem in an afternoon. Founded in 2019 by Dr. Clemens Brunner, Dr. Fabian Knirsch, and Erich Höpoldseder in Puch bei Hallein near Salzburg, Sproof Sign specialises in eIDAS-compliant digital signatures at all three levels: simple (EES), advanced (FES), and qualified (QES). The qualified signature carries the same legal weight as a handwritten signature across every EU member state — a capability that most US-based e-signature platforms either lack entirely or bolt on through third-party partnerships.

Sproof Sign operates from EU-hosted, ISO 27001 certified data centres with an explicit no-data-transfer-to-third-countries policy. The platform integrates natively with Microsoft 365 (SharePoint, Teams, Word) and supports multiple European eID providers including ID Austria, PrimeSign, and InfoCert. Since launch, it has earned IÖB certification for use in Austrian public administration and serves organisations from solo practitioners to enterprise-scale deployments.

Key Features

Three-Tier eIDAS Signature Support

Sproof Sign supports all three eIDAS signature levels in a single platform. Simple Electronic Signatures (EES) work for low-risk documents like internal approvals. Advanced Electronic Signatures (FES) provide signer identification and tamper detection for contracts and agreements. Qualified Electronic Signatures (QES) carry full legal equivalence to handwritten signatures and are required for specific document types in many EU member states — real estate transfers in Austria, notarial acts in France, employment contracts in Belgium. Most competitors offer only EES and FES. Sproof Sign's native QES support removes the need for a separate qualified signature provider.

Microsoft 365 Integration

The SharePoint integration lets users send documents for signature directly from their document library. Signed documents sync automatically back to their original SharePoint location. Microsoft Teams integration enables signature requests within collaborative workspaces, and the Word add-in embeds signing workflows into the document editing process itself. For organisations running Microsoft infrastructure, this eliminates the context-switching that standalone signature platforms require.

European eID Hub

Sproof Sign connects to multiple European electronic identity providers. Austrian users sign via ID Austria. German users can authenticate through yes (formerly YES) and other German eID providers. Italian signers use InfoCert. This multi-provider approach means that signatories across different EU countries can use their existing national eID rather than creating a new account with a third-party trust service. The friction reduction for cross-border signing is substantial.

Workflow Configuration

Each signature request can define specific signature standards per signer — one party might sign with QES while another uses FES, based on the document's legal requirements. Sequential and parallel signing workflows control the order of signatures. Role-based distribution assigns documents to the correct signers automatically. Template management stores recurring document configurations for consistent deployment.

API and Automation

Sproof Sign exposes a REST API for embedding signature capabilities into existing IT systems. Contract management platforms, HR onboarding workflows, and procurement systems can trigger signing requests programmatically. Zapier integration extends connectivity to platforms without native API integration, though at the cost of an additional subscription.

Pricing

Sproof Sign's pricing uses a signature-package model rather than unlimited signing. The free tier covers private use for individuals, students, and non-profits — a generous entry point that few competitors match.

Paid plans start at EUR 14 per month for the User tier, including an annual package of advanced and qualified signatures. The User+ tier at EUR 24 per month increases the signature allocation and adds priority processing. Enterprise pricing is custom and includes API access, white-labelling, and dedicated Microsoft 365 integration support.

A 14-day free trial is available for all paid tiers. The per-signature-package model benefits organisations with predictable signing volumes but can become expensive for high-volume use cases. Organisations signing hundreds of documents monthly should request enterprise pricing to avoid per-package constraints.

Compared to DocuSign's EUR 25 per month starting price (which excludes QES entirely), Sproof Sign delivers more compliance capability at a lower entry point.

EU Compliance & Privacy

Sproof Sign's compliance position is built into the product architecture. All data centres are ISO 27001 certified and located within the EU. The company explicitly states zero connection to third countries — no US sub-processors, no transatlantic data transfers.

eIDAS compliance covers all three signature levels with QES signatures verified through EU-regulated qualified trust service providers. FDA 21 CFR Part 11 compliance extends the platform's utility into life sciences and pharmaceutical documentation. IÖB certification authorises use in Austrian public administration procurement.

As sproof GmbH, an Austrian limited liability company, the entity falls under Austrian and EU jurisdiction with no parent company dependencies outside Europe.

Who It's Best For

Legal professionals and notaries handling contracts that require qualified electronic signatures under eIDAS — real estate, corporate governance, notarial acts. The native QES support is a hard requirement for these use cases.

Austrian and DACH-region businesses deeply integrated with Microsoft 365. The SharePoint, Teams, and Word integrations create a seamless signing experience within existing workflows.

Public sector organisations in Austria and the EU that require IÖB-certified or eIDAS-compliant signing platforms for procurement and administrative documents.

Cross-border European businesses sending documents for signature across multiple EU countries. The eID hub's multi-provider support reduces friction for international signatories.

The Verdict

Sproof Sign occupies a strategic niche: eIDAS-compliant digital signatures with genuine QES support, built on EU-only infrastructure with strong Microsoft 365 integration. For organisations that need qualified signatures — and many European businesses legally do — it is one of the few platforms that delivers natively rather than through third-party bolt-ons. The per-signature pricing model and limited non-Microsoft integrations are genuine constraints. For its target market of European legal, public sector, and compliance-driven organisations, Sproof Sign delivers capabilities that DocuSign and other US competitors cannot easily replicate.

Frequently Asked Questions

Is Sproof Sign eIDAS compliant?

Yes. Sproof Sign supports all three eIDAS signature levels: Simple (EES), Advanced (FES), and Qualified (QES). QES signatures carry the same legal weight as handwritten signatures in all EU member states.

Where is Sproof Sign data stored?

All data is processed and stored in ISO 27001 certified EU data centres. Sproof explicitly maintains zero data connection to third countries, including the United States.

How does Sproof Sign compare to DocuSign?

Sproof Sign offers native eIDAS QES support and EU-only data processing. DocuSign has broader global integrations and brand recognition but limited European QES support and US-based data processing. Sproof Sign starts at EUR 14 per month versus DocuSign's EUR 25 per month entry price.

Is there a free version of Sproof Sign?

Yes. Private users, students, and associations can sign documents free of charge with full legal validity under eIDAS. A 14-day free trial is also available for all paid business plans.

Does Sproof Sign integrate with Microsoft 365?

Yes. Native integration with SharePoint, Microsoft Teams, and Word allows signing directly within the Microsoft ecosystem. Signed documents automatically sync back to their original SharePoint location.