EU Sovereignty Score
Self-hosted / open sourcePhoto & VideoHeadquarters: FR

Siril: sovereignty score and 8 European alternatives

Siril is software for processing astronomical images, aimed at amateur astronomers and researchers. It calibrates raw frames with bias, dark and flat files, aligns multiple images, stacks them to improve the signal-to-noise ratio, and then offers tools to refine the result. Siril runs as a desktop application on Linux, Windows and macOS, and also comes in a variant without a graphical interface for scripting.

Siril is developed by the free-astro community and released under the GPL (version 3 or later). There is no identifiable legal entity: the source code lives on GitLab and managed by the development team. According to the paper about the software in the Journal of Open Source Software, three of its four authors are based in France and one in the United Kingdom. The software runs entirely on your own computer, so your images stay with you. No vendor platform is required, and the source code is free to inspect and modify.

See the 8 European alternatives ↓Assess your stack with Siril pre-selected
MastodonLinkedInBlueskyXEmail
Sovereignty score
94 / 1000 = high exposure
100 = sovereign
  • Jurisdiction SOV-2100
    Headquartered in the EU: European law applies
  • Data residency SOV-3100
    EU-only hosting
  • Cryptographic key sovereignty SOV-390
    Self-hostable: encryption keys under your own control
  • Freedom from lock-in SOV-680
    Open source: low switching costs
  • Source & runtime sovereignty SOV-4 · SOV-6100
    Source code auditable, forkable and self-hostable

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 14, 2026
Headquarters
FR (EU)Verified by hand
Sovereignty model
Open-source, distributedVerified by hand
Data hosting
EUVerified by hand
Open-source
YesVerified by hand
GDPR-compliant
NoVendor-stated
Category
Photo & Video
Type
Product
Website
siril.org ↗

How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to Siril

The European alternatives to Siril come from our knowledge base of over 8,400 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

31 European Photo & Video vendors are in the catalogue. View the whole category · Submit an alternative · View category on the map

Is Siril 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 Siril

Siril is headquartered in FR and therefore falls under European law: the GDPR, NIS2 and the Data Act. No foreign legislation can compel access to your data.

Data is hosted exclusively in the EU, so Siril scores best on data residency.

Siril is open source. You can audit the source code, self-host the software and keep the encryption keys under your own control. Switching is easier because data and software are not tied to a single party.

What this means for your organisation depends on your whole stack and context. The free assessment weighs Siril 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 Siril?

It depends on your use case. Strong EU alternatives to Siril include Audacity, Black&White projects and Blender Video Editor. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to Siril?

Yes. Open-source EU alternatives to Siril include Audacity, Blender Video Editor, darktable and digiKam. These keep your data fully under your own control and let you self-host if you want to.

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

Siril is headquartered in FR (EU) and hosts data in EU. It is also open-source, so you can self-host it. That makes Siril an EU-sovereign choice in its own right; the EU alternatives on this page are comparable European tools.

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 14, 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

In the changelog

Earlier changes to this page, as listed in the public changelog.

Digital sovereignty in Photo & Video

Photo & Video: Photo editing, video editing, colour grading and media production. 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 Photo & Video page — with no effect on your score
8 European alternatives to Siril — GDPR-compliant & EU-hosted · EU Sovereignty Score