ProofstayFree calculators
Check a number without the app
Each calculator uses the same tested rule code as the Proofstay app. They run in your browser: nothing you type is sent anywhere.
EUOpen →
USOpen →
UKOpen →
Schengen 90/180 calculator
Days used, days left and your latest exit date for any list of trips.
Substantial Presence Test
IRS weighted days over three years, whether you meet 183, and days left.
UK residence test checker
Nights and ties against the HMRC tables.
NYSoon
State 183-day counter
Days in a state for the tax year.
When a calculator isn't enough
Someone may ask you to prove it.
A calculator only knows what you type. Proofstay records the country, US state or Canadian province you are in every day on your iPhone, proofs each record the moment it is made, and turns any period into a day-by-day report. Free to record.
See how Proofstay works →