For everyone who builds, checks or signs off on Excel
Take the
guesswork out of Excel.
Trust your models again.
PerfectXL finds the errors in your spreadsheets, shows how a model really works and tracks every change between versions, with the Excel you already use. So you can review faster, hand over safely and decide with confidence.
- Works with your existing Excel
- Runs offline on your machine
- Built with TU Delft
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Trusted by audit, finance and risk teams at
Why it matters
Your decisions run on Excel. So do the errors.
Budgets, valuations, provisions and pricing are still built in spreadsheets, and checked by hand. One wrong reference rarely announces itself. It shows up later, in a board decision, an audit finding or a headline.
Up to 94%
of business spreadsheets contained errors in the most thorough field audits
€40M
budget gap for the City of Utrecht after one missed inflation correction in Excel
$92M
lost by Norway’s sovereign wealth fund due to an error in Excel
Products & services
Software for your models, experts for everything else
- Most complete
PerfectXL Suite
Detect mistakes, understand models and compare versions. Use the tools as offline, stand-alone software, or straight from Excel with the PerfectXL Add-in.
Risk Finder
Audit spreadsheets, detect mistakes, identify risks
Explore
Lists and visualizations for complex models
Compare
Version management, down to formulas and VBA
Highlighter
Temporary colours for data and formula consistency
Built for your role
Whatever your part in the model, PerfectXL has your back
Every spreadsheet passes through several hands. Each one needs something different.
Client cases
What changes when teams stop checking by hand
It’s without a doubt Top 5 in the world in terms of mitigating human errors, visualizing changes and analyzing potential risk factors.
Pascal Schoneberg
M1KLLC
Insurance
Fewer errors in complex models, faster onboarding
Insurance company VGZ →
Accountancy
Five-minute scans before every review
International accounting firm →
Energy
Missing subsidiary caught before sign-off
Global energy company →
Advisory
No more confidential data hidden in client files
Big Four consultancy →
- Who is PerfectXL?
Built on research,
not guesswork
PerfectXL is an Amsterdam team with 12 years of spreadsheet risk research behind it. Every check rests on 39 principles for sound Excel models, developed together with TU Delft.
In 2026, Excel professionals at the Global Excel Summit in London voted the PerfectXL Add-in Best Excel Add-in.
Your data stays with you
Offline, stand-alone analysis on your own machine
ISO/IEC 27001 certified
Independently audited information security
Developed with
- TU Delft
- Microsoft
- Erasmus University
- Microsoft MVPs
- Software Improvement Group
- SourceLab
Ready to stop losing sleep
over spreadsheet errors?
One hidden mistake shouldn’t cost your company millions, or cost you your reputation. Get in touch with our experts to see how PerfectXL can safeguard your most critical models, cut your review time in half, and give you total peace of mind.
Let’s make your spreadsheets bulletproof.
- Run it on your own file, not a canned dataset
- Nothing leaves your environment
- 14 days, all capabilities, no card