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Founders & product teams

Think the product through before you build it.

Put the business model, the roadmap, and the product on one board that your team and your AI can both read.

Create your first boardSee how it works

The whole company on one canvas.

Early on, the thinking behind a product is spread out: the business model in a doc, the pitch in slides, the roadmap in a tracker, and a flow sketched on a whiteboard that got wiped. In Grein, one project holds all of it, with a nested board for each.

Start from the Lean canvas template to fit the business on one page: problem, customers, value proposition, channels, costs, revenue, and an experiments column for the riskiest guess. When the story is clear, the Pitch deck template turns it into ten slides, one idea each, before anyone opens a slide tool.

Example board

Plan the product where everyone can see it.

The Product roadmap template sorts work into now, next, and later under this quarter’s goals, with a Not doing note so the same debate doesn’t happen twice. Beside it, the User flow template gives each screen a box and each action an arrow, with the edge cases listed next to the flow.

For engineers, the System design template draws services as boxes and data flow as arrows, keeps the API contract in a code block next to the diagram, and records each decision with its trade-off. Paste links to the tickets, docs, and prototypes it relates to, and the board stays the map of how everything fits.

Example board

Ask AI about the whole picture.

On Pro, Dia, Grein’s built-in assistant, reads what’s on your board. Ask it to poke holes in the lean canvas or point out what the roadmap is missing, and it adds its suggestions as notes you keep or delete.

If your team already works in Claude or ChatGPT, connect it over MCP from Settings → Connections. It can read and edit your boards with your access. On desktop, you can also connect your own Claude or ChatGPT account in place of Dia.

Example board

How to take an idea from canvas to roadmap

This works for a new company, a new product, or a large feature inside an existing one.

  1. Fill in the lean canvas

    Start with the customer and the problem, and write down how people solve it today. Put the riskiest assumption in the experiments column.

  2. Map the product

    Lay out the main user flow, one box per screen and one arrow per action, and note what can go wrong at each step.

  3. Sort the work

    Move what you’ll build into the roadmap’s now, next, and later, each item tied to a goal. Give anything with moving parts a system design board.

  4. Look back and adjust

    After each sprint, run the Retrospective template in the same project, and leave with an owner and a date for every change.

Habits that keep a product board useful

  • One project per product

    Business model, roadmap, flows, and architecture as nested boards, so the reasoning behind a decision is one click from the decision.

  • Write down what you’re not doing

    A visible Not doing list ends debates that would otherwise come back every planning meeting.

  • Keep experiments next to the guesses

    The assumption, the test, and the result side by side show what you’ve actually learned.

  • Link out to your tracker

    Day-to-day tickets usually stay in your issue tracker. Paste the links beside the roadmap items they belong to.

Questions, answered.

Workflows for this kind of work

Create your first
board.

Start with a question or a few notes. Bring people in when it’s ready.

Create your first board