Moving from Trello

What comes across

Export your board from Trello as JSON (Menu, More, Print and Export, Export as JSON) and drop the file in. Nothing is created until you have seen a preview of exactly what will be.

• —Lists, in order, including which one means “done”.
• —Cards with their descriptions, due dates and start dates.
• —Labels, mapped onto Tarsen's palette rather than invented.
• —Checklists, with each item's ticked state.
• —Comments, with who wrote them and when.
• —Attachments. Links come across as links; files stored inside Trello come across as links back to Trello, and the preview tells you how many.
• —Archived cards, still archived.

Trello's own file storage needs a Trello login to download, so an importer cannot fetch those files. They arrive as links to where they already live, and the preview says how many before you commit. Everything else lands in one step, and importing the same file twice is detected and refused unless you say to go ahead.

If your board lives in a spreadsheet rather than in Trello, a CSV with a title column works too, plus columns for list, description, labels, priority, due date and estimate if you have them.

What you get that Trello does not offer

• —Mission Mode: a realistic plan for today, scored on due dates, priority, estimates and the capacity you actually have.
• —An MCP server, so Claude can read and act on your real board instead of you pasting cards into a chat.
• —A calendar that shows the estimate booked on each day, and a timeline that shows how the plan overlaps.
• —Recurring cards that only reappear once you finish the last one, so two weeks away leaves one card waiting rather than fourteen.
• —Card identifiers like TAR-102, priorities, estimates, blocked state with a reason, and sub-cards.
• —A command palette and a full keyboard layer.

What Trello still does better

• —Power-Ups. Trello has a large ecosystem of integrations; Tarsen does not.
• —Butler automation. Tarsen has recurring cards, but no general rule builder, deliberately.
• —Native mobile apps. Tarsen installs as a progressive web app, which is close but not identical.
• —Sheer familiarity. If your team already knows Trello, that is worth something real.

If those matter more than a planned day, stay where you are. Migrating a tool your team already understands has a cost that no feature table shows.

Getting your data back out

Export any project, or the whole workspace, as JSON or CSV whenever you like. The JSON round-trips the structure and the CSV opens in a spreadsheet, and it comes straight back in through the importer, so leaving is the same two steps as arriving.