Proper Spreadsheets

Most spread­sheets have mistakes in them. Find yours.

Every mistake we can find, pinned to its cell, with what it costs. Your first check is free.

See plans

Need a spreadsheet instead? Make one or pick a template.

Drop your spreadsheet hereChoose your spreadsheet

or

Drop another spreadsheet here, orAnother spreadsheet?

Excel .xlsx or CSV files up to 20 MB, or a Google Sheet. The free check reads up to 5,000 formulas. No .xls or .xlsm: older formats and macros are a risk we will not open.

No file to hand?

Your file is deleted the moment your report reaches you, and never later than ten minutes after the check. Nothing in your cells is kept, logged or used to train anything.

The total looks right. It is not.

  1. 1Drop in a spreadsheet
  2. 2Every formula is checked
  3. 3Each mistake, pinned to its cell

See this finding as your report shows it

Turn on JavaScript to see the finding.

A sample file, checked by the real engine when this site started. Every figure and finding above came from that check.

What it looks for

  • Totals that stop short

    A sum that ends at row 50 when the figures run to row 73.

  • Calculations typed over

    A typed number where every other row calculates.

  • Rows that break their column

    One formula quietly unlike the hundred around it.

  • Broken and hidden errors

    #REF!, #DIV/0! and errors hidden behind IFERROR as a calm zero.

  • Totals that disagree

    A total that does not match the rows above it.

  • Rates typed into formulas

    A rate written into a formula, where it will never update.

It finds these kinds of mistake, not every mistake, and it is no substitute for professional judgement. What it finds, it shows you.

Free for one file. Watching from £19 a month.

Spreadsheets change every week. The paid plans watch your files and tell you what changed.

Free

£0

  • One file at a time
  • One file a month, five with a free account
  • Up to 5,000 formulas
  • Every finding, in full
Check a file

Solo

£19 a month or £190 a year Free for 7 days

  • 20 watched files
  • Just you
  • As many files checked as you like
  • Your file marked up to download
  • Checked within the hour when a file changes
  • A monthly report of what changed
  • Up to 100,000 formulas a file
Choose Solo

PracticeRecommended

£59 a month or £590 a year

  • 200 watched files
  • 3 people
  • As many files checked as you like
  • Your file marked up to download
  • Files grouped by client
  • Everything in Solo
  • Up to 100,000 formulas a file
Choose Practice

Firm

£149 a month or £1,490 a year

  • 2,000 watched files
  • 10 people
  • As many files checked as you like
  • Your file marked up to download
  • Activity log export
  • Everything in Practice
  • Up to 100,000 formulas a file
Choose Firm

Need the spreadsheet itself?

We make them too, formulas in place and checked by a real spreadsheet engine.

Make one from a sentence

Say what you want to keep track of and get a finished file with tabs, formulas, dropdowns and totals. Free to design and preview.

Make a spreadsheet

Start from a finished one

34 ready made spreadsheets for budgets, invoices, rotas and more at £4.99 each, and two free to download.

Browse the templates