Mobilizon

Decentralized Application

Federated event planning and group management platform — a free alternative to Facebook Events, Meetup, and Eventbrite. Each instance is independently operated; instances federate via ActivityPub, allowing users on one instance to register for events and join groups hosted on others. Features include account-based event creation, multi-identity profiles, group pages, and discussions, with a search index aggregating events across the federation

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Details

License AGPL-3.0 (gitlab framasoft.org / github mirror)
Dev Status 🟢 Active
Dev Status Detail Released — production; Framasoft handed primary maintenance after v4
Owner Framasoft (French non-profit promoting free software and free culture)
Governing Body Framasoft (French non-profit)
Country France
Start Year 2019
Stack Elixir (Phoenix backend); Vue.js (frontend); GraphQL API; PostgreSQL
Funding Framasoft donations; original development funded by 2019 crowdfunding campaign
Last Investigated Jul 1, 2026

Use Case Domains

Co-Creation & Knowledge

Affordances

Decentralized scheduling Protocol federation

Decentralized Application Attributes

Origins Framasoft (built via crowdfunding raising more than the initial €20,000 goal in 2019)
Database PostgreSQL
Query Language GraphQL
Data Formats ActivityStreams 2.0 / ActivityPub; iCalendar (ICS) feeds
Collaborative Live Editing No (event-by-event editing model)
Rich Text Editing Yes (event descriptions and group pages)
Mobile Support Responsive web; third-party mobile clients via Fediverse
Web Support Yes (primary interface)
Native Apps No first-party native apps; some third-party clients via Fediverse
Terms Open source AGPL-3.0; federation policy and moderation set by each instance operator
Funds Unknown — initial 2019 crowdfunding raised €58,000+ for v1 development; ongoing funding via Framasoft general budget (donation-supported French nonprofit) without a published Mobilizon-specific line item
Based On ActivityPub; ActivityStreams 2.0
Use Case Category Event organization; group coordination; activist mobilization; alternative to Facebook Events / Meetup
User Interface Type Web app (responsive)
Offline Capabilities No (server-dependent)
Collaboration Features Multi-identity accounts, group pages, group discussions, event comments, RSVP management
Data Portability Federation-based — instance-portable in principle; no built-in cross-instance migration
Integration Ecosystem Fediverse — interoperates with Mastodon, PeerTube, and other ActivityPub services; Mobilizon Search Index aggregates federated events
Web2 Data Export ICS export for events with tentative/confirmed/cancelled status; standard data export tools; ActivityPub objects accessible from compatible Fediverse clients
Prosocial Coherence Strong — explicitly designed for activist coordination, climate movements, and civil society organizing; nonprofit stewardship; federation policies emphasize community moderation rather than centralized rules
Economic Flows None — no native payment, dues, or contribution flows; integration with external payment systems possible but not built in
Governance & Decision Making Per-instance governance — each instance defines its own moderation policies, federation choices, and terms; Framasoft governs the joinmobilizon.org reference instance; group-internal coordination happens via the platform's discussion features
Media / Publishing Pages feature for organizational publishing; event descriptions with rich content; not a primary publishing platform but supports it
Knowledge Management Limited — groups have discussion and pages; no dedicated KM features
Sensemaking N/A — not a sensemaking tool; events and groups are the primary primitives
Project Management Group coordination through events, discussions, and pages; not a dedicated project tool
Communication Model Federated server-to-server (ActivityPub); user-to-server (account-based)
Network Resilience Federation — no single controlling instance; each instance operates independently and chooses federation peers
Discovery Mechanism Mobilizon Search Index (search.joinmobilizon.org); instance-level browsing; ActivityPub follow relationships
Max Participants Per-event RSVP scales with instance capacity; federation aggregates across many instances
Data Sovereignty Instance-based — operators control instance data; users can choose instances aligned with their values