For snowbirds, nomads & multi-state residents
A native iOS app that records the days you spend in each US state and foreign country, on the phone you already carry. Your location history never leaves the device. Each day is hash-chained into a cryptographic record you, your CPA, or an auditor can verify offline.
Exports and backups never leave this device unless you share them. Nothing is transmitted automatically. No analytics, no crash reporter, no ad tracking. The only outbound request is a hash-only submission to a public RFC 3161 timestamp authority — never your location, never anything that identifies you.
What it does
Uses iOS background location (visit detection and significant location changes) to assemble a day-by-day record of the US states and foreign countries you spent time in — no manual logging required.
CLVisit + significant change · on-device only
Set a threshold (for example, the 183-day common-law test in many US states) and receive a local notification before you cross it.
Local alerts · never push from a server
Each day’s record is SHA-256 hashed into a chain and periodically anchored to a public RFC 3161 timestamp authority (FreeTSA), so a later edit is detectable.
SHA-256 chain · FreeTSA RFC 3161
Your records export as plain CSV, JSON, Audit Evidence JSON, and plain-text summaries so your CPA or tax attorney can read them without any tool from us. The 30-day trial lets you try the workflow before subscribing.
CSV · JSON · audit evidence · cancel anytime in iOS Settings
For tax preparers & auditors
SnowbirdDays exports an Audit Evidence JSON artifact: a single self-describing document containing the daily attestation chain and its anchor receipts. A standalone Swift verifier on the public site confirms the chain offline.
Common questions
Does the app send my location anywhere? How do I delete my data? What happens if my subscription lapses? The support page answers these directly — no autoresponder.
Browse support or email support@snowbirddays.app.