How to use the Sequence diagram template

Start a board from it
Use this template opens a new Freero board with the Sequence diagram template on it (sign up free first). On a board you already have, open Templates in the toolbar and search for “Sequence diagram”.
Follow the instruction on the board
“Time runs down. Solid arrows are calls, dashed ones replies. Drag a message end along a lifeline to reorder it.”
Fill in each part
- Browser
- Web app
- Auth service
- Database
- alt [password matches]
- Notes Add a lifeline per system that takes part. Keep message names to what is sent, not how.
- Open question Should failed attempts be rate limited per email or per IP?
Bring your team and your agents
Invite people to the board or share a link, and work on it together live. The timer is in the top bar, private mode and voting in the board menu, and Claude or ChatGPT can join through Freero’s MCP server.

Work on it with an AI agent

Connect an assistant once and it works on the board with you, with your permissions: by default it reads and proposes, and people decide.

You ask: “Fill in the Sequence diagram board from these notes.”
What happens It reads the board, then proposes sticky notes for it. Nothing changes until someone on the board accepts them.
You ask: “Group what we wrote into themes and list the actions.”
What happens It proposes clusters with a title each and task cards for the actions, labelled with its name and yours.

Data model (ERD)
An online shop’s tables and how they relate, drawn with crow’s-foot ends.
System architecture
Users, apps, services, data stores and outside providers, with what talks to what.
CI/CD pipeline
From pull request to production across four lanes, with BPMN events, tasks and gateways.
System context sketch
The big picture of one system: who uses it, which other systems it talks to, and what flows between them.
Domain events workshop
Map a business process as the events that happen in it, with the commands, people and rules around each one.
Data pipeline map
Follow data from where it comes from to where it’s used: each stage, its owner, the checks and how fresh it is.