Free · local browser check

Spot fragile Excel formulas before copying them down 10,000 rows.

Paste one formula. The checker looks for common maintenance risks and explains what to test. Your formula stays in this browser and is not uploaded.

This is a heuristic review, not an Excel calculation engine. A clear result does not prove that references, business logic or outputs are correct.

Choose the next step without repeating this check

Download the CAD 5 Excel Formula Debug Workbook for a self-guided six-check workflow and twelve boundary tests, or buy a written review of one formula for CAD 9.

Secure Stripe checkout. The workbook downloads after confirmed payment; written review starts after the formula context arrives.

Workbook details · Review scope and the CAD 19 option