Once a month is done, you usually want to look back at it — not for blame, but to see what actually happened. The monthly archive is where past months live, and the Sankey diagram is the picture of where the money went.

Open the archive

Go to Budget. You'll see a list of every month you've used BudgetLabs, newest first.

Tap a month to open the archive view. You get:

The summary block (planned vs. actual income, expenses, savings).
Every category's planned vs. actual.
Every transaction logged in the month, grouped by category.
The Sankey flow at the top.

Reading the Sankey

A Sankey diagram is a flow chart. Income enters on the left, splits into category bands in the middle, and exits on the right. The thickness of each band is proportional to its dollar amount.

What it shows you in two seconds:

Which category absorbed the largest share of income.
How much you actually moved into savings (the savings band on the right).
Whether the picture matches the plan you set at the start of the month.

The dashboard answers "am I on track?" The Sankey answers "where did it all go?"

When to use the archive

End of month — a five-minute review. What surprised you? What was wrong with the plan?
End of quarter — patterns become visible. Seasonal categories light up.
Before a big planning session — open the last three months side-by-side to set a realistic next-month default.

Comparing months

Use the month selector at the top of the archive to jump between months. The Sankey re-renders for each one.

For more rigorous side-by-side comparison and projection, see Lab > Insights and Lab > Scenarios.

What the archive does not do

It doesn't lock the past. You can still edit transactions in any month, including months that are years old. Edits update the totals and Sankey on the fly.