Why Your Credit Score Is Different on Every App You Check

People check three apps, get three numbers, and reasonably conclude that somebody is wrong. Usually nobody is. The number depends on which file was read and which model read it, and there are far more combinations in active use than most people realise.

Three Files, Not One

Equifax, Experian and TransUnion each maintain a separate file on you. A lender may report to one, two or all three. A collection may appear on one and not the others. An error can exist on a single report while the other two are clean.

So before any model runs, there are already three different sets of underlying facts.

Two Companies, Many Versions

FICO and VantageScore are different companies with different models. They weight things differently and they do not produce the same number from the same file.

Worse for anyone trying to make sense of it: multiple versions of each are in simultaneous use. A mortgage lender may pull an older FICO version because that is what the secondary market requires, while your banking app shows a current VantageScore. Both are real scores. They are answering slightly different questions.

Which One "Counts"

The one the lender pulls. That is the only honest answer, and it is why chasing a specific app's number is a poor use of attention.

What is portable across all of them is the underlying file. Every model reads payment history, how much is owed, how long the history runs, and what mix of accounts is present. Improve the file and every score responds, in its own way and on its own scale. Optimise for one app's number and you have optimised for one lender's possible choice.

The Ranges Are Not Comparable Either

Most FICO and VantageScore models run 300 to 850, which invites direct comparison. But some FICO industry-specific versions — the auto and bankcard ones — run 250 to 900. A number without its model name attached does not mean very much.

What to Do Instead

• Watch direction, not level. Whether your own number on a single app is trending up over months is informative. Whether it matches a different app is not.
• Read the report, not the score. Errors live in the report. Free weekly access to all three at annualcreditreport.com, which is the site set up under federal law and has nothing to sell you.
• Ignore anyone quoting you points. A company promising "+40 points" does not know which bureau, which model, or what else is on your file. Neither does anyone else.

The variation between apps is not a flaw in the system to be solved. It is the system working as designed, and it stops being confusing the moment you stop expecting a single number to exist.