The analysis is identical
Signed in or not, the same engine runs in your browser on the same decoded audio and produces the same numbers.
Sign in.
The tool on this site runs without an account. Signing in is only for one thing: getting back to reports you have already saved.
Your saved reports are on the member site
Accounts and saved report history have lived on the studio site since the tool launched, and they have not moved yet. The sign-in below goes there. It is a different address on purpose, and it is the address your reports are actually stored against.
What signing in does and does not change
Nothing about the measurement.
An account only keeps the report
The single thing it adds is history — a completed report stored against your account so you can open it again later.
You can skip it entirely
No account is required to measure anything. Nothing on this site is held back behind one.