At we help our users to bring focus in their work by making complex work simple. A key driver in complexity in work is that work needs to be split into smaller pieces then distributed amongst teams or grouped into bigger chunks. To manage distributed work effectively, you need to link and sync cards. This is where card mirrors come into play.

What it does

This power-up links and syncs cards across boards in Trello, either by making mirrors manually or making mirrors automatically, for example to mirror a card to my personal board when I'm assigned to the card, or to raise an impacted card to the stakeholders board by assigning the 'stakeholder' label to the card. Mirrors cannot only be created between cards, it is also possible to create mirrors from a checklist item on one board to a card on another board. Or to share cards across multiple boards.

This way it is possible to create cascading work breakdown structures that helps teams to manage a portfolio in programs in projects, or a product backlog that consists of epics and user stories into tasks to sync the work between the product team and the development team.

How I built it

The power-up is based on the placker platform, for this power-up we added two features; 1. the ability to create mirrors by using mirror rules in Placker and 2. the ability to mirror multiple cards in one mirror group.

Challenges I ran into

Allowing multiple cards in a mirror group turned out to be tricky as it could happen that the update on one card triggered and update on another and a loop was introduced.

Accomplishments that I'm proud of

We have been testing these features already with a selected user group and the responses have been very great, this power-up contains a lot of the lessons we have learned over the years with regards to why and how people mirror cards, with more features to come very soon.

What I learned

We have learned a lot on the technical side related to managing async updates in groups and ensuring rules get executed correctly. On the functional side on why and how our users are using mirroring and what features are

What's next for Board mirror (by Placker)

  • We will release more triggers and actions for the rules, specifically the ability to automatically create item to card mirrors when a user is assigned to a checklist item.
  • We will be moving the mirror overview and mirror actions to the card-back-are so they are more clear in Trello and some other UI/UX improvements based on feedback that we'll get from our user group.

Try it out

The power-up is not yet officially released, when you are already a placker user, please reach out to us in the chat so we can add you to our Mirror user group and help you get set.

Until then, be sure to test our Projects by Placker Power-up in the power-up directory on

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