Non-EU vendorSMS APIsHeadquarters: US

OneSignal: sovereignty score and 8 European alternatives

OneSignal is a customer engagement platform that lets organisations send messages to the users of their apps and websites. It supports mobile and web push notifications, email, SMS and RCS, and in-app messaging, with SDKs for Android, iOS, Flutter, React Native and Unity, among others. It also offers tools for customer journeys, personalisation and analytics, plus an AI feature for drafting and optimising campaigns. The service is delivered as a cloud service.

OneSignal is provided by OneSignal, Inc., based in San Mateo, California, and is subject to US jurisdiction. According to its privacy policy, data is hosted and stored in Europe and accessed from the United States; no specific location or hosting provider is named. For transfers the company relies on European Standard Contractual Clauses and is certified under the EU-US Data Privacy Framework. The policy does not mention a data processing agreement by name. A European organisation would be well advised to have it confirmed where data is held, which sub-processors are used and on what terms access from the United States takes place.

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Sovereignty score

27 / 1000 = high exposure
100 = sovereign

Jurisdiction SOV-210
Headquartered in the US: CLOUD Act and FISA 702
Data residency SOV-350
Hosting inside and outside Europe (EU, 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 13, 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	EU, USVerified by hand
Open-source	NoVerified by hand
GDPR-compliant	YesVendor-stated
Category	SMS APIs
Type	Product
Website	onesignal.com ↗

How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to OneSignal

The European alternatives to OneSignal come from our knowledge base of over 8,000 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

40 European SMS APIs 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 OneSignal

OneSignal 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.

OneSignal hosts data in EU, US. Exactly what stays within the EU — and what does not — is defined by the vendor's data processing agreement and sub-processor list, not by a setting you control yourself; check those documents for the precise scope, including backups, logs and support access.

OneSignal 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 OneSignal 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 OneSignal?

It depends on your use case. Strong EU alternatives to OneSignal include 46elks, Agile Telecom and AnyMessage. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to OneSignal?

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

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

OneSignal is headquartered in US and hosts data in EU, 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 13, 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 SMS APIs

SMS APIs: API services for sending SMS messages to customers. 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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