Mobilizon

Open-source event organizing from the Fediverse, honestly reviewed. No marketing fluff, just what you get when you self-host it.

TL;DR

• What it is: Open-source (AGPL-3.0) federated event and group management platform — think Facebook Events and Meetup, but running on ActivityPub, on your own server, with no ad-targeting [1][2].
• Who it’s for: Privacy-conscious organizers, activist groups, local communities, and anyone who wants to run recurring events without feeding data to Facebook or paying Meetup’s organizer subscription [1][2].
• Cost savings: Meetup charges organizers roughly $29.99/month. Eventbrite takes 3.5% + $1.59 per ticket on paid events. Mobilizon self-hosted costs whatever your VPS costs — typically $5–10/month — plus zero per-event fees.
• Key strength: Federation. Your instance connects to every other Mobilizon instance and the broader Fediverse via ActivityPub, which means attendees don’t need an account on your server to discover or join your events [1][2].
• Key weakness: Serious recent usability complaints — one AlternativeTo reviewer (November 2024) reports login appearing broken, search non-functional, and group creation failing across five different browsers [1]. With only 155 GitHub stars and slow release cadence, the project’s active maintenance is unclear.

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What is Mobilizon

Mobilizon is a federated, self-hosted platform for creating and managing events and groups. It was built by Framasoft, a French non-profit dedicated to free software and digital emancipation [3]. The pitch, from Mobilizon’s own positioning: “From a friends and family birthday party to a march for climate change, today, our gatherings are trapped in the tech giants’ platforms. How to get organized, how to click on ‘I join’ without providing intimate data on Facebook or locking yourself in MeetUp?” [2].

That framing tells you exactly who Framasoft built this for. Not startups running growth webinars. Not SaaS companies with Eventbrite integrations. The target is communities — climate groups, neighborhood associations, activist networks, local open-source meetups — that have been using Facebook Events by default because nothing else was easy enough, and who are uncomfortable with what that actually costs.

The ActivityPub federation layer is the structural differentiator. Mobilizon isn’t one website like Meetup.com. It’s a protocol. You can run your own instance, join a community-run one, or point your attendees to joinmobilizon.org’s instance directory. An attendee on a different Mobilizon instance can still discover and RSVP to your events without creating an account on your server [1][2]. That’s the Fediverse model — the same reason your Mastodon account can follow someone on a different Mastodon server.

The project launched around 2018–2019 and reached version 4 in December 2023, which added the ability to import and synchronize events from Facebook and Meetup — a meaningful addition for anyone migrating their existing community calendar [1]. As of this review, it sits at 155 GitHub stars, which is a strikingly low number for a self-hosted tool of this scope, and a useful signal about where it sits in the self-hosted community’s awareness versus more prominent tools in the space.

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Why people choose it

The reasons people gravitate toward Mobilizon split cleanly into two camps: ideology and economics.

The ideological camp is the primary one, based on the review record. AlternativeTo users consistently cite privacy and anti-surveillance as the core motivation. “THE free and open-source alternative to Facebook Events,” writes one user [1]. “Open-sourcing events rather than Facebook selling your data and Meetup charging you,” writes another [1]. The Framasoft connection matters here — Framasoft has a decades-long track record in the French free software movement [3], and their involvement gives Mobilizon credibility with communities who care about provenance as much as features.

The economic camp is smaller but clear. Meetup’s organizer pricing has been a recurring grievance for community organizers since the platform moved away from its free tier. Local tech meetups, book clubs, running groups, and civic organizations that run events several times a month found themselves looking at $300+/year for the privilege of using a platform their attendees had always assumed was free. Mobilizon is, financially, a straight-line replacement: no per-event charges, no organizer subscription, no percentage of ticket sales [1][2].

What the negative reviews say. The honest picture is messier. A November 2024 AlternativeTo reviewer describes the software as “completely unusable” — login appeared to not register, search produced no results, and the group creation button failed entirely across five browsers [1]. A January 2024 reviewer documented a different problem: the French interface makes extensive use of interpuncts (middle dots) as a gender-neutral writing convention — an unconventional typographical choice that the reviewer found disruptive to readability, pedagogically problematic, and lacking any option to disable [1]. Neither of these is a trivial complaint. The first suggests possible serious regression bugs in a production instance; the second is a genuine accessibility and UX issue for non-French users running the French localization.

The older positive reviews (2019–2021) describe a project that worked and was valuable. The 2024 reviews raise flags about where the project is now. That gap is worth taking seriously.

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Features

Based on AlternativeTo’s feature list and what’s publicly documented:

Core event management:

• Create events with title, description, location, date/time, cover image
• Public, restricted, and private visibility settings
• RSVP and attendee management
• Event ticketing support [1]
• Recurring event scheduling
• iCal export for calendar integration

Groups:

• Create groups with members and roles
• Group-specific event calendars
• Discussion boards within groups
• Multiple profile support — you can participate under different identities without creating separate accounts [1]

Federation and discovery:

• ActivityPub federation with other Mobilizon instances and the broader Fediverse [1][2]
• Public event discovery across federated instances
• Community-based event discovery [1]
• No tracking across sites [1]

Import (added in v4, December 2023):

• Import and synchronize events from Facebook [1]
• Import and synchronize events from Meetup [1]
• This is the most practical migration feature — you can bring your existing event history over rather than starting from scratch.

Mobile:

• Android app available via F-Droid and standard app stores [2]
• iOS support listed among platforms [2]

What’s absent from the feature list:

• No paid ticketing integration (Stripe, etc.) — if you charge for events, you’ll need a separate solution
• No built-in email marketing or attendee messaging beyond basic notifications
• No analytics dashboard comparable to Eventbrite or Meetup’s organizer tools

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Pricing: SaaS vs self-hosted math

Mobilizon (self-hosted):

• Software license: $0 (AGPL-3.0) [1][2]
• Hosting: $5–10/month on any Linux VPS (Hetzner, Contabo, DigitalOcean)
• Per-event cost: $0

Mobilizon (managed instance, e.g. joinmobilizon.org):

• Free to use on community-run instances. You get all features, but you’re dependent on whoever runs that instance. Pricing data for dedicated managed hosting is not available for this review.

Meetup (their SaaS):

• Attendees: free to browse and RSVP
• Organizers: roughly $29.99/month (Pro), or ~$23.99/month billed annually — that’s $288–$360/year before you’ve run a single event
• Meetup also historically offered a free organizer tier they then removed, which is part of why migration interest exists

Eventbrite:

• Free events: free to publish
• Paid events: 3.5% + $1.59 per ticket (Essentials), higher tiers available with lower per-ticket fees plus monthly subscription
• If you’re running a 100-person event at $20/ticket, Eventbrite takes roughly $230 in fees. Mobilizon takes $0.

Facebook Events:

• No direct cost, but the price is your attendees’ behavioral data being used for ad targeting. This is precisely the trade Mobilizon is designed to avoid [1].

Concrete scenario: A local community organization running 4 events/month with ~50 attendees each, using Meetup as organizer. Annual cost: $288–$360/year on Meetup, plus any ticketing fees elsewhere. With self-hosted Mobilizon on a $6/month Hetzner VPS: $72/year. Savings: roughly $200–$290/year — modest in absolute terms, but meaningful for volunteer-run organizations.

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Deployment reality check

The self-hosting story for Mobilizon is more involved than Docker-Compose-and-done tools. Framasoft provides installation documentation, but you’re setting up an ActivityPub server, which has moving parts: the application itself, a PostgreSQL database, an Elixir/Phoenix runtime, and an outbound email provider for notifications.

What you actually need:

• A Linux VPS with at least 1–2GB RAM
• Elixir/Erlang runtime (or Docker)
• PostgreSQL
• A domain name with DNS configured (mandatory for federation — federation won’t work without a proper domain)
• Outbound SMTP for event notifications

AGPL-3.0 implications: Unlike MIT-licensed tools, AGPL-3.0 means that if you modify Mobilizon and run it as a network service, you must publish your changes. For most self-hosters running it stock, this is irrelevant. If you’re building a business on top of a modified Mobilizon, you’ll want to understand this before deploying.

What can go sideways: The November 2024 usability review [1] is a yellow flag here — if the software has regressions visible on public instances, self-hosted deployments may hit the same issues. The project’s GitHub star count (155) and release history suggest a slower development pace than the tools with active commercial backing. Before committing to a production deployment, spin up a test instance and validate the core user flows: creating a group, creating an event, and having a test user RSVP. The reviewer who failed across five browsers [1] suggests these may not be edge cases.

Federation setup: Unlike a single-tenant app, federation means you need to think about how your instance communicates with others. If you’re running this for a private community and don’t want federation at all, Mobilizon allows closing registration and running effectively as a private instance. But the value proposition of cross-instance event discovery requires federation to be on and working.

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Pros and cons

Pros

• Actually free for organizers. No per-event fees, no organizer subscription, no percentage of ticket sales [1][2]. This is a structural advantage over Meetup and Eventbrite for frequent, low-revenue community events.
• Federation via ActivityPub. Attendees from any Fediverse instance can discover and join events [1][2]. Your community isn’t siloed to one platform.
• No ad-targeting or data harvesting. The explicit design goal is to move events off platforms that monetize attendee behavior [1][2][3].
• Multiple profiles. One account, multiple public identities — useful for organizers who run several distinct community spaces [1].
• Android app + F-Droid availability. Not just a web app; mobile-first attendees are covered [2].
• Facebook and Meetup event import (v4). Migration path exists without manual re-entry of your event history [1].
• Framasoft backing. A non-profit with an established track record in the French free software community [3], not a venture-backed startup likely to pivot or shut down.

Cons

• Serious recent usability complaints. A November 2024 reviewer reports login, search, and group creation all broken across five browsers on a live instance [1]. This is the most significant red flag in the review record.
• Low GitHub activity. 155 stars suggests limited community adoption compared to comparable self-hosted tools. Slow release cadence (v3.1 in June 2023, v4 in December 2023) means bugs may wait longer for fixes.
• AGPL-3.0, not MIT. AGPL’s network-use copyleft clause matters if you’re customizing and deploying for clients. It’s not a casual license for commercial modification [1][2].
• French localization has interpunct issues. The gender-neutral typography convention (middle dots) in the French interface was flagged as disruptive to readability with no way to disable it [1]. Non-issue if you’re running English, worth verifying for French-language deployments.
• No built-in paid ticketing. If your events charge admission, you need to bolt on Stripe or a separate ticketing solution yourself.
• Federation complexity. Running an ActivityPub server is more operationally complex than running a simple web app. DNS, federation allowlists/blocklists, and cross-instance discovery all require setup and occasional maintenance.
• Limited third-party reviews. The review corpus for this article is thin — mostly listing-site entries rather than in-depth writeups. This makes it harder to triangulate real-world experience compared to tools with active communities producing guides and forum posts.

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Who should use this / who shouldn’t

Use Mobilizon if:

• You’re running events for a community group, activist organization, local tech meetup, or civic association that currently uses Facebook Events — and you want to stop feeding attendance data to Facebook.
• You’re paying Meetup’s organizer subscription for non-commercial community events and want to eliminate that recurring cost.
• Your attendees are already in the Fediverse, or you want to make it easy for Mastodon and other ActivityPub users to discover your events without creating new accounts.
• You have (or can hire) someone comfortable setting up a Linux server, and you’ll validate the installation before going live.
• You understand and accept AGPL-3.0 terms for your deployment context.

Skip it (stay on Meetup or Facebook Events) if:

• Your events depend on reaching new attendees through platform-native discovery. Meetup’s SEO and recommendation engine still drives significant event discovery; Mobilizon’s federated model doesn’t replicate that for audiences who aren’t Fediverse users.
• You need paid ticketing with integrated payment processing. Eventbrite and Luma handle this; Mobilizon doesn’t.
• The 2024 usability reports concern you and you can’t afford to validate before committing. A broken group-creation flow on a production instance is not a minor bug.
• You’re building a commercial product that needs custom modifications — AGPL-3.0 has real implications.

Skip it (pick Gancio or Get Together) if:

• You need a simpler shared agenda or local event board without the group management complexity. Gancio [2] is a lighter-weight self-hosted option for community event listings that may be easier to maintain.

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Alternatives worth considering

From the AlternativeTo listings and the broader space:

• Facebook Events — the default everyone is fleeing. Massive reach, zero organizer cost, complete data surveillance. The incumbent this tool is explicitly designed to replace [1][2].
• Meetup — dominant for interest-based groups, strong discovery, organizer costs $29.99/month, fully closed-source [2].
• Eventbrite — best for ticketed events with payment processing, percentage-based fees, proprietary [2].
• Luma Events — clean modern UX, free tier, good for conferences and small community events, proprietary SaaS [2][4].
• Gancio — Italian-origin open-source shared local event agenda, simpler than Mobilizon, also self-hosted [2].
• Get Together — BSD-licensed open-source event manager for local communities, simpler feature set [2].
• Cactoide — AGPL-3.0 mobile-first RSVP platform, described as an alternative to Meetup and Eventbrite for small groups, Docker-based self-hosting [4][5].
• Flockstr — Nostr-based events platform, MIT-licensed, for communities already in the Nostr ecosystem [4][5].

The realistic comparison for a community organization moving off Facebook Events is Mobilizon vs Gancio vs Get Together. Mobilizon is the most complete but also the most operationally complex. Gancio is lighter. Get Together is simpler still. If you don’t need federation, Get Together may be the lower-friction path.

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Bottom line

Mobilizon is the right idea with an honest execution gap. The premise is sound: events don’t belong to Facebook, Meetup’s organizer fees are punishing for volunteer-run communities, and ActivityPub federation is a genuinely superior architecture for decentralized event discovery. Framasoft has a real track record and the AGPL-3.0 license is at least honest about what it is.

But the 2024 review record is a problem. When a user tries five different browsers and can’t create a group on a live instance [1], that’s not a configuration issue — that’s a software quality problem. With 155 GitHub stars and a release pace measured in half-years, the question isn’t whether Mobilizon is theoretically the right tool. The question is whether it’s actively maintained enough to trust for a community’s event infrastructure in 2026.

If you’re evaluating this for a real deployment: stand up a test instance, run through the core user flows yourself, and check the project’s commit history on Framasoft’s Gitlab before committing. If it works cleanly, the self-hosting math is compelling and the federation story is genuine. If you hit the usability issues described in recent reviews, you haven’t lost much.

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Sources

1. AlternativeTo — Mobilizon Reviews and Details (9 reviews, 34 likes). https://alternativeto.net/software/mobilizon/about/
2. AlternativeTo — 12 Great Meetup Alternatives (Mobilizon listed as top alternative). https://alternativeto.net/software/meetup/
3. Framasoft — Popular Education (Framasoft organizational context; Mobilizon developer). https://framasoft.org/en/educ-pop/
4. AlternativeTo — Openki Alternatives (Mobilizon listed). https://alternativeto.net/software/openki/
5. AlternativeTo — Agorakit Alternatives (Mobilizon listed). https://alternativeto.net/software/agorakit/

Primary sources:

• Official website: https://joinmobilizon.org
• Framasoft (developer organization): https://framasoft.org