Formula Spy
Read any formula, however nested.
- Inspect nested Excel formulas with tree and outline views.
- Trace precedents and dependents from the selected formula.
- Evaluate sub-expressions step by step inside the task pane.
See inside your Excel models.
Mac-Cel is a professional Office add-in suite for finance and consulting teams. Inspect formulas, review spreadsheet risks, map sheet dependencies, and carry firm standards into PowerPoint — without leaving the workbook.
Free · Runs in Excel and PowerPoint for Microsoft 365 · Formula and risk analysis stays on your machine
Formula · selected cell
=IFERROR(INDEX('FY26 Model'!$H$14:$H$62, MATCH($B21&"|"&C$4, 'FY26 Model'!$A$14:$A$62, 0)) * (1 + Assumptions!$D$9), 0)
In the field
Used by professionals at these firms.
The problem
Inherited models are opaque
You open a file someone else built. The formulas are nested, the sheets are many, and the logic that matters is three references deep. Reading the formula bar is not enough.
Risk hides in plain sight
Hardcoded numbers, Excel errors, empty inputs, and hidden content sit next to live formulas. A reviewer who only spot-checks cells will miss them.
Structure is invisible
Which sheets are inputs and which are outputs is rarely documented. Cross-sheet wiring is left for the next person to reconstruct by hand.
Modules
Four tools for the workbook you inherited.
Find Risks
Review the workbook before someone else does.
- Flag high-risk issues like Excel errors, hardcoded numbers, empty inputs, interrupted formulas, and hidden content.
- Tag findings as risk, weakness, or observation.
- Track review status as you work through a workbook.
Workbook Flow
See how the workbook is actually wired.
- Map how worksheets depend on each other.
- Drill from a connection into the formulas that create it.
- Classify sheets as inputs or outputs by reference linkage.
Excel Objects
Every object in the workbook, in one list.
- Catalog tables, names, pivots, charts, and more — then jump to them.
- Preview the VBA modules present in a workbook.
- See which formulas reference a given table, name, pivot, or external source.
Firm Standards
Your firm's standards, carried into PowerPoint.
Publish brand standards once. Check decks against them, insert approved charts and tables from a shared library, and keep Excel exhibits linked to the slides that show them.
Brand Manager
Define and publish colors, fonts, formats, logos, and approved masters.
Shared Library
Firm and personal libraries for chart styles, table styles, and pictures.
Deck Check
Scan a deck against published standards (Layer 1).
Link to PowerPoint
Refresh linked Excel pictures in PowerPoint from a saved workbook.
Data handling
Where the analysis runs.
Formula and risk analysis runs in Excel — not by uploading your model to Mac-Cel for scanning. Account data, brand profiles, and library assets use Mac-Cel Cloud.
Stays on your machine
- Formula parsing and evaluation
- Risk detection
- Sheet dependency mapping
- Object inventory
Goes to Mac-Cel Cloud
- Account and license data
- Firm brand profiles
- Shared library assets
Audience
Built for.
Investment banking / private equity
Inherit and stress-test models you did not build.
Consulting and model QA
Check junior work before it goes to a client.
FP&A and corporate finance
Recurring models, handoffs, and structure that is hard to see.
Brand and presentation ops
Firms that live in both Excel and PowerPoint.