Calculator Express with Notes vs Location Tax Tracker

Hello there! This is Calculator Express. We are introducing you a beautifully designed app, that includes 6 handy tools: - Currency converter - Unit converter - Percentage calculator (hey marketers, this feature is for you) - BMI calculator - Tip calculator - World time converter (and many more tools will be added very soon, stay tuned!) You can customise Calculator Express as you wish - color, fonts, app icon, buttons background and even more! But what else? Guys, we think that calculation history is a very important feature and that's why we decided to make it more convenient - we added labels and notes to your calculations. Pin, copy and share. We think our app will be a great companion and just a handy simple tool. Privacy policy: https://calculator.express/assets/privacy.html Terms of Use: https://calculator.express/assets/terms.html

TaxTrack builds a private, time-stamped record of where you have been — so you can defend your tax-residency status with evidence, not memory. Designed for Puerto Rico Act 60 residents, California non-residents under FTB §17014 audit risk, and anyone tracking IRS Substantial Presence Test thresholds, TaxTrack captures your location every six hours, classifies each capture against bundled jurisdiction polygons offline, and hash-chains the result so the record can be verified later. EVIDENCE SOURCES • Six-hour location captures on UTC boundaries • Photo metadata import (GPS + timestamps; pixels never read) • Flight events synced from the Flighty calendar • Manual corroboration notes for unverified days OFFLINE JURISDICTION CLASSIFICATION TaxTrack ships with Natural Earth admin-0 and admin-1 polygon data and the evansiroky timezone-boundary dataset. Every capture is classified without a network call. We never use Apple's online geocoder for classification — only for human-readable address hints. HASH CHAIN INTEGRITY Each capture is SHA-256 hashed into a chain against the prior record. Tampering, reordering, or deletion is detectable. The chain is mirrored to your iCloud private database and verifiable from the app or from exported data. CALENDAR-AWARE FLIGHT EVIDENCE TaxTrack reads calendar events synced by Flighty (only those — every other event is ignored), extracts departure and arrival airports, classifies each endpoint, and optionally fills inferred gap days between flights with an audit-readable "inferred" flag. Calendar events are never modified. EXPORT FOR AUDIT Settings → Export package produces a folder containing CSV, JSON, a human-readable hash chain, and a monthly-map PDF. AirDrop it to your accountant, your attorney, or an auditor. THREE-YEAR PR ROLLING COUNTER The app tracks year-to-date Puerto Rico day counts and the three-year rolling total used in the Substantial Presence Test, plus California day counts and the §1.937 30-day international allowance. PRIVACY-FIRST TaxTrack has no server. Your data lives on your device and (optionally) in your own iCloud private database that only you can access. No analytics, no telemetry, no third-party SDKs, no ads. Photo pixels are never read. WHAT THIS APP IS NOT TaxTrack is not legal or tax advice. The records it produces are supporting material. Talk to a licensed attorney or CPA for any residency question. The app is a personal-use audit-trail tool. REQUIREMENTS • iOS 17 or later • "Always" location access for background captures • Optional: iCloud sync, photo library access, calendar access • Optional: Sign in with Apple (for multi-device sync identity)