Non-EU vendorE-signaturesHeadquarters: US

SignatureAPI: sovereignty score and 8 European alternatives

SignatureAPI is an API that lets developers add electronic signatures to their own apps and workflows. It supports multiple signers (up to ten), sequential or parallel signing, bundling several documents into one envelope, templates and a dashboard. No-code connectors are also available, including for Power Automate and Zapier. According to the vendor, its signatures are classified as eIDAS simple electronic signatures (SES). The service is delivered as a SaaS API.

SignatureAPI is operated by Signature API, Inc. The company states no business address; its terms are governed by Delaware law and its privacy policy says data is transferred to and processed in the United States. The privacy policy contains a GDPR section for EEA residents, and the vendor has a separate data processing agreement; no EU data centre region is mentioned. European organisations having sensitive documents signed through it are therefore exposed to US jurisdiction, including the CLOUD Act.

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Sovereignty score

17 / 1000 = high exposure
100 = sovereign

Jurisdiction SOV-210
Headquartered in the US: CLOUD Act and FISA 702
Data residency SOV-30
No hosting in Europe (US)
Cryptographic key sovereignty SOV-320
Key management with a non-European vendor
Freedom from lock-in SOV-640
Closed source: switching requires data migration
Source & runtime sovereignty SOV-4 · SOV-615
Closed source, runtime with the vendor

SOV codes: the matching objective in the European Commission's Cloud Sovereignty Framework. Official source

How the score is calculated

Facts and evidence

Last checked October 11, 2026

Headquarters	US (US)Verified by hand
EU adequacy decision	Only for companies individually certified under the EU-US Data Privacy FrameworkVerified by hand
Sovereignty model	Vendor-hosted (non-EU)Verified by hand
Data hosting	USVerified by hand
Open-source	NoVerified by hand
GDPR-compliant	YesVendor-stated
Category	E-signatures
Type	Product
Website	signatureapi.com ↗

How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to SignatureAPI

The European alternatives to SignatureAPI come from our knowledge base of over 7,800 vendors. We only list vendors headquartered in the EU or the EEA; fully European-owned vendors rank before vendors with a foreign owner. For each alternative you see the country, the open-source status and a short description.

Score per alternative: 0 = high exposure, 100 = sovereign

63 European E-signatures vendors are in the catalogue. View the whole category · Submit an alternative · View category on the map

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Why digital sovereignty matters with SignatureAPI

SignatureAPI is headquartered in the United States. US vendors fall under the CLOUD Act and FISA 702: US authorities can compel access to data, even when that data sits in a European data centre. That is the core of the jurisdictional exposure in our model.

SignatureAPI hosts data outside the EU (US). Personal data therefore leaves the EU, which requires a transfer mechanism under the GDPR and pulls the data residency score down.

SignatureAPI is closed source and hosted by the vendor. The encryption keys and the runtime sit with the vendor and switching requires data migration. Ask about bring-your-own-key, export options and open standards.

What this means for your organisation depends on your whole stack and context. The free assessment weighs SignatureAPI together with your other vendors and gives a total score, a heatmap and the main risk drivers.

Frequently asked questions

What is the best European alternative to SignatureAPI?

It depends on your use case. Strong EU alternatives to SignatureAPI include A-Trust, Agrello and ANF AC. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to SignatureAPI?

Our list of EU alternatives to SignatureAPI is mostly commercial options. Browse the category on the map for open-source choices.

Is SignatureAPI GDPR-compliant and where is the data hosted?

SignatureAPI is headquartered in US and hosts data in US. The vendor states it is GDPR-compliant, but the data falls under non-EU jurisdiction. For full EU data residency the EU alternatives on this page usually offer more certainty.

Details and sources

Verified by handHeadquarters, owner, hosting locations and licence have been checked by us against public sources. Free of charge and for every vendor, not a paid label. Nothing in this knowledge base is taken over automatically. Last checked on October 11, 2026.

Sources

Public sources used in the latest check of this record.

Compliance evidence

The links below point to the vendor's own public documents. We only record what we found: a missing link means "not found publicly", not "not compliant".

No public compliance evidence has been recorded for this vendor yet. Do you know its DPA or subprocessor list? Something wrong? Suggest a correction

Digital sovereignty in E-signatures

E-signatures: Electronic signatures, trust services, eIDAS services. In this category the choice of vendor determines who has legal access to your data, where that data lives and how easily you can switch later.

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