What is Calkin?

Understand any Excel model
in seconds.

Calkin is an Excel add-in that visualizes sheet structure, surfaces hidden risks, and traces every formula dependency — so your team can review models 10× faster and avoid costly errors.

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Feature 1

Navigator

The Navigator gives you a bird's-eye view of your entire workbook. Sheets are categorised as Source (raw data), Analysis (calculations), or Output (results). Arrows show exactly which sheets feed which. Each node displays its error, risk, and legacy-formula counts at a glance — click any node to trace its connections, or press Risks to drill into a grouped list of every issue and jump straight to the offending cell.

Excel Workbook score isGood

◆Legacy Formulas13

Source Sheets

Analysis Sheets

Output Sheets

Click a sheet to highlight its connections.

Feature 2

Explain Formula

Click any cell and Calkin decomposes its formula into an interactive dependency graph. Each node represents one part of the formula — hover it to highlight the exact segment in the formula bar. When a formula contains an IF, the branch not taken is shown in white so you instantly see which path is active. Input cells, cross-sheet references, and dependents are all visible at once.

Dependency Graph

Hover nodes in the graph to highlight the relevant part of the formula.

Revenue Analysis · C5Aggregates revenue from Sales Data for a specific region

=SUMIF('Sales Data'!A:A, A5, 'Sales Data'!D:D)

Sales Data!A:A

Region column

"North"

Sales Data!D:D

Revenue column

SUMIF

42,500

Dashboard!B2

Hover a node to highlight its role in the formula above.

Ready to try it on your own files?

Calkin installs as an Excel add-in in under a minute. All data stays on your machine — nothing is uploaded.

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Understand any Excel modelin seconds.

Navigator

Explain Formula

Ready to try it on your own files?

Understand any Excel model
in seconds.