EU Sovereignty Score
Non-EU vendorBrowserHeadquarters: GB

SigmaOS: sovereignty score and 8 European alternatives

SigmaOS is a browser for macOS, built on Apple's WebKit engine and written in native SwiftUI. It offers workspaces, vertical tabs, split-screen viewing and an AI assistant called Airis. Passwords can be stored in Apple Keychain. Windows and iOS versions were announced by the vendor as planned but not yet available.

SigmaOS Inc. is registered in England and Wales, with its registered office in London, so the publisher is outside the EU. Its privacy policy says personal information may be stored and processed in any country where the company operates, without naming those countries. Cloud sync, which is off by default, runs on Amazon Web Services, and the AI assistant is described as using LLM agents whose processing locations are not stated. A European organisation should assess these transfers before enabling sync or the AI features.

See the 8 European alternatives ↓Assess your stack with SigmaOS pre-selected
MastodonLinkedInBlueskyXEmail
Sovereignty score
32 / 1000 = high exposure
100 = sovereign
  • Jurisdiction SOV-250
    Headquartered outside the EU (GB)
  • Data residency SOV-30
    No hosting in Europe (OTHER)
  • Cryptographic key sovereignty SOV-340
    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-630
    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
HeadquartersGB (OTHER)Verified by hand
EU adequacy decisionYes — found adequate by the European CommissionVerified by hand
Sovereignty modelVendor-hosted (non-EU)Verified by hand
Data hostingOTHERVerified by hand
Open-sourceNoVerified by hand
GDPR-compliantNoVendor-stated
CategoryBrowser
TypeProduct
Websitesigmaos.com ↗

How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to SigmaOS

The European alternatives to SigmaOS come from our knowledge base of over 6,800 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

18 European Browser vendors are in the catalogue. View the whole category · Submit an alternative · View category on the map

Is SigmaOS one of many dependencies?

Score your whole stack in about three minutes. Free, no account needed.

Assess your stack →View a sample report (opens in a new tab)

Why digital sovereignty matters with SigmaOS

SigmaOS is headquartered in GB, outside the EU. Contracts and data therefore also fall under non-European law. The GDPR applies through contractual terms, but in a conflict with local legislation you have less certainty than with a European vendor.

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

SigmaOS 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 SigmaOS 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 SigmaOS?

It depends on your use case. Strong EU alternatives to SigmaOS include Ecosia Browser, Falkon and Iridium Browser. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to SigmaOS?

Yes. Open-source EU alternatives to SigmaOS include Falkon, Iridium Browser, Konqueror, LibreWolf, Midori, Mullvad Browser and Nyxt. These keep your data fully under your own control and let you self-host if you want to.

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

SigmaOS is headquartered in GB (OTHER) and hosts data in OTHER. Its GDPR compliance is limited or unclear. 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

Cyber Resilience Act

Public signals that relate to the EU Cyber Resilience Act. They do not count towards the score. A missing line means "not found publicly".

We found none of these signals on the vendor's own site when we checked.

For products in scope of the CRA, CE marking is required from 11 December 2027; this cannot be checked yet.

Checked on October 11, 2026. What is the Cyber Resilience Act?

Digital sovereignty in Browser

Browser: Web browser — browsing, privacy, extensions, sync. 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.

Also in this category

See all →
Open in the alternatives dashboardMissing a vendor? Submit itAre you this vendor? You can also become a sponsor on the Browser page — with no effect on your score
8 European alternatives to SigmaOS — GDPR-compliant & EU-hosted · EU Sovereignty Score