Introduction to Decidim

Decidim, a web platform


  • A software for any actor eager to engage in a participative approach.
  • Online platform that allows the set up ofparticipatory processes through its numerous functions.
    Examples: participatory budget, debate, contributation space (allows users to "post" contributions), questionnaires/forms, etc. .
  • Allows organizations to have a digital tool dedicated to participation.

"The Decidim platform ("We decide" in Catalan) is one of the most emblematic projects in the ecosystem of civic technologies. Born in Barcelona and initially financed by the municipality, it is built since its origins on the model of a common. The source code of Decidim is made available under the following license GNU GPL, which allows the reuse and evolution of the program as long as you share the identical modifications. But Decidim goes further by adding to the licence clauses, the adhesion to a social contract, setting out the additional "democratic safeguards" that must be respected when using the platform. »


Civic Tech, Data and Demos report.

🖥 platforms

deployed across 18 countries

Check the list.


maintain the software and ensure its continuous evolution with several new versions released per year.

Check the Github.

🤝 Partners

Decidim is a network of organizations (public institutions, universities, companies, foundations and associations).

See the list.

🏆 Second prize

for the most innovative open source software awarded by the European Union in 2019

See the tweet

Free and open source software

  • Everyone has the opportunity to adapt the software, improve it or analyze its code.
  • Promise of greater quality (continuous improvement), greater security (the code can easily be tested and corrected) and total transparency.
  • Enables the development of a more open and participatory democracy.
  • Builds trust: data management, transparency, etc.

Participatory budgeting, consultation forums, calls for ideas, referendums... the digital platform offers all the usual participation solutions, but it has the particularity of being part of an approach of "digital communities", designed under a free licence, i.e. their code is open. A guarantee of transparency for its creators, and also a means of pooling the tool, which can be copied free of charge and improved by other players, as part of a "social contract".

Claire Legros

Journalist, The World

Service offering

Our technical and consulting teams will help you:

A solution certified by :

Installation, configuration, adaptation


Quantitative summaries
and qualitative summaries

of new functionalities

Design of
your participative approaches


Animation and

"Decidim is now asserting itself as a true digital commons. Proof of this is that a growing number of public players are using Decidim internationally (in France, Finland, Belgium, Mexico, etc.) and adapting it to their uses, also attracted by the great modularity of the digital platform and the range of participatory functionalities offered. »

Digital Society Mission

"Penser ensemble le numérique" report,Labo Société Numérique

Four areas allowing the creation of functionalities and content: Concertations, Assemblies, Initiatives, Votes, etc.


  • The Concertations are suitable for the establishment of a temporally-bound participatory mechanismwith steps (participatory budget, classic consultation with collection/proposal voting for example, etc.).


  • The Assemblies are better suited to a participatory governance over a long period of time. It is also possible to create sub-assemblies and/or to link an assembly with a consultation.
    → Assemblies can for example be useful to set up a participatory mechanism within an organisation, allowing the creation of working groups/sub-groups via sub-assemblies.


  • The Initiatives are a space similar to a petitions (coming soon).
  • The Votes allow for the implementation of referendums (coming soon). 
  • The Conferences allow you to enter information about a particular event in order to provide a maximum of detail on the programme, benefit from a more developed registration module, etc.

Numerous participation modules:


  • Proposal : allows for the creation of a participatory space for users to post a contribution/idea/proposal; to vote for proposals; to support proposals (equivalent to the "Like" functionality); to comment on proposals; to filter proposals, etc.
  • Meetings: allows you to highlight an event (workshop, public meeting, debate, etc.) by indicating its date, location, description/objectives and/or by integrating visuals (posters, "flyers", etc.).
  • Survey Create surveys/forms/questionnaires and choose how to answer them: single choice; multiple choice; short answer; long answer; sort in the desired order. This feature allows you to easily set up a registration form, questionnaire or survey that lends itself to the format.
  • News : allows you to organize a "blog" type section on the platform, allowing users to comment on the different articles and the administrators to communicate. 

  • Debates : enables open debates initiated by the administrator and/or by users through a comment thread.
  • Budgets : enables the set up of a participatory budget after a submission of proposals by users or by the administrator. Users can thus vote for different projects, follow the budget and its evolution, etc.
  • Page Create and edit pages that inform the user about the platform administrator, the current consultation, the methods of participation, the objectives, etc. 
  • Random selection:allows you to draw lots for applications/proposals. For example, it can be useful to create assemblies by random selection.
    Example of the platform of the European Metropolis of Lille
  • Follow-up: The "Follow-up" functionality allows users to monitor the progress of implementation (overall, by category and/or by sub-category) of an action linked to a concertation.
    Example of the Barcelona Platform


Functionality Details

  • Category : allows the creation of categories and permits users to classify their proposals by theme (e.g. housing, environment, social justice, etc.).
  • Sectors allows you to create geographical categories (e.g. by neighbourhood, district, etc.).
  • Pages : allows you to create "cold pages" (FAQ, T&Cs, Legal Notice, etc.)

Advantages of the Decidim platform 

A social and engaging dimension: 

User profiles enables the development of a form of a social network, including the possibility for users to subscribe to a profile, exchange messages, create user communities, etc.

A transparent participatory path from the submission of an idea to its realization

A platform offering real traceability of participation through the proposal and follow-up modules. For each proposal, Decidim makes it possible to indicate its origin, whether it comes from a public meeting, an institution or a group of citizens.
A proposal on Decidim is living content that can be linked to other content on the platform: an investment project from the participatory budget, an achievement announced by an institution whose progress is monitored over time.

An inclusive and accessible platform through the combination of digital technologies and face-to-face interaction:

16% of French people do not feel able to carry out procedures online, 40% are worried about the idea of carrying out procedures online and 28% would like to be assisted in local establishments. This shows a real need to combine digital and face-to-face tools, in order to allow the greatest number of people to participate. Thus, the "represented user" function makes it possible to contribute on the platform in the name of a person, whether or not they already have an account. This can be very useful to include people who are not very familiar with digital technology in a participatory process, for example by collecting contributions in markets or during a door-to-door session.

Convinced by Decidim?

Read our references and their detailed presentation pages.
Discover the specificities of each Decidim by OSP platform.

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