A microblogging app built from Bluesky's own client, run by the Eurosky programme. People post text, photos and video, follow others and read feeds, including a customisable news feed, across the AT Protocol network, with a Eurosky account or any other.
03–01Belowcompute, networks and resources are not recorded per app
Every layer above links to what it rests on. The figure counts the EU, the EEA, Switzerland and the UK as European, as the landscape does.
How it is run
nine questions
ArchitectureWho holds your account and posts?
Open protocol, through Bluesky Social PBC
open protocol: yes
move your account and keep your followers: yes
hub: Bluesky Social PBC
Posts live in each user's AT Protocol repository, whether on Eurosky's server or another provider's, and a Eurosky account can migrate elsewhere keeping its handle, followers and follows. By default mu reads posts through Bluesky's AppView in the US, and it also uses Bluesky's search, direct messages and PLC directory. Eurosky's own AppView is in beta and opt-in.
Stichting Modal funds mu through grants, donations and unspecified "programme revenue", and says it will never sell data or profile users for ads. Eurosky started on money from the Free Our Feeds campaign, raised mainly from individual donors plus several foundations, and Germany's SPRIND is now backing a feed-algorithm project. The terms allow for optional paid features later, but none is live and no plan is stated.
Eurosky FAQ, how is Eurosky funded?raised funds primarily through individual donations, as well as the contributions of several foundationsread 28 Sep 2026
control: Stichting Modal, a Dutch foundation with no shareholders; board: Ivan Sigal (executive chair), Robin Berjon, Sherif Elsayed-Ali
Modal was founded in November 2025 to deliver a commitment of the Free Our Feeds campaign, and it runs both mu and the Eurosky account server. A stichting has no owners, so it cannot be sold; control lies with its board.
mu terms of service, s.1a non-profit foundation established under the laws of the Netherlandsread 28 Sep 2026
Modal Foundation, board and historyModal was founded in November 2025, fulfilling a commitment of the Free Our Feeds campaignread 28 Sep 2026
FeedWho decides what you see?
Feeds you choose
Users pin and switch between feeds, including third-party AT Protocol feeds, and can turn off personalised recommendations. A code change merged on 22 September 2026 makes Eurosky's own "For you" feed the landing feed for new users (previously Bluesky's Discover), though the terms say default feeds still rely on Bluesky's AppView during the transition. Eurosky is also developing a "bridging" ranking algorithm with SPRIND and TU Dresden.
mu applies Bluesky's moderation labels as its baseline and is introducing its own moderation layer, which will be able to reverse those labels. Until that layer is live, mu can suspend accounts but cannot hide individual posts. Users can add third-party labelling services on top, and the Eurosky account server itself removes only illegal content.
Stichting Modal says it will not train general-purpose AI models on users' content without separate opt-in consent, and it will never sell personal data. Opt-out does not apply because training would need opt-in. The commitment leaves out AI-based spam and abuse detection, and the policies do not address training by third parties that read public AT Protocol posts.
This counts the accounts hosted on the Eurosky server, including 931 deactivated and 36 taken down, the same way Eurosky's live stats page counts them. It is not a count of mu users, since mu also serves accounts hosted elsewhere (for example on Bluesky). No mu-specific figure is published.
A Dutch foundation (The Hague, RSIN 868779465) with no shareholders, governed by a board of Ivan Sigal, Robin Berjon and Sherif Elsayed-Ali. It grew out of the Free Our Feeds campaign and runs both mu and Eurosky accounts.
mu terms of service, s.1mu is operated by Stichting Modal, a non-profit foundation under Dutch law, as part of the Eurosky programme.read 24 Sep 2026
07Shared servicesWhat does it lean on but not run?
Bluesky Social PBC · United States
also Stichting Modal · Netherlands: Eurosky's own AppView (beta, opt-in), relay and feed generator, on Hetzner
By default mu reads through Bluesky's AppView, and uses Bluesky's search, direct messages, image and video CDN, moderation labels and feature flags. Identities resolve through the PLC directory, which Bluesky runs on AWS in Ohio while a Swiss association is set up to take it over. Eurosky's own AppView is in beta and can be selected in settings.
mu privacy policy, s.22.2 (v1.1, in force 19 Sep 2026)fetched and served through Bluesky's appview in the United States, so your interactions and the content displayed to you may transit Bluesky's US-based infrastructureread 24 Sep 2026
07VerificationWho checks users' identity, age or account?
hCaptcha (Intuition Machines, Inc.) · United States
checks: account
ID needed to post: no
No identity check; the age gate is a self-declared date of birth (18+). Sign-up on the Eurosky server passes an hCaptcha bot check, run by Intuition Machines in the US and served through Cloudflare, which the policies do not name. Optional badges come from volunteer trusted verifiers, and mu also shows Bluesky's.
mu privacy policy, s.10We do not, at launch, use payment-card checks, government-ID verification, or any third-party age-assurance vendorread 24 Sep 2026
measured · js.hcaptcha.com · AS13335 Cloudflare, Inc. · 18 Oct 2026 · loaded by the sign-up gate at eurosky.social/gate/signup, with an hCaptcha site key
06ModelsWhose models moderate, rank or check?
None
Planned, not running. AI-based detection is to come with mu's own moderation layer, from an unnamed vendor. Until then the automated signal is Bluesky's labels (see shared).
mu privacy policy, s.7 and s.23.3We may use automated systems (including AI-based systems) to detect spam, abuse, and prohibited contentread 24 Sep 2026
05DataWhere does the data sit?
Stichting Modal · Germany
also Bluesky Social PBC · United States: serves users' content through its US AppView while mu relies on it
where: Eurosky accounts sit on Eurosky's server at Hetzner in Germany. The mu web app is stored in Bunny.net's EU data centres, and analytics run on Plausible (EE).
transfers: To Bluesky in the US, for content delivery, search, media, direct messages and labels, on the basis of the contract and the public nature of posts; no standard contractual clauses are cited. Also to Apple and Google for push, once the apps ship.