01
Log your trips
Add stays manually, or opt in to on-device location tracking that turns your GPS into a country — never a raw coordinate. Manual entries always take precedence.
183 − 165 =
18 days
days counted, one UK tax year
For the globally mobile
Know your days.
Keep your residency.
Every day you spend in a country is counted against the exact tax-residency rules that matter — UK, US, Schengen and beyond. See how much headroom you have left, before you cross a line.
✦ 290 automated tests · rules cited to HMRC & IRS · private by default
see it work
The product
The product, in view
How it works
How it works
02
The engines run
Your day counts are run through the actual UK, US, and Schengen statutory tests — not a generic 183-day guess applied everywhere.
03
See your headroom
A day count and, where the test supports it, a residency verdict with a confidence tier — or an honest "Estimate only" where a flat rule would mislead.
The engines
The engines, explained
UK
UK Statutory Residence Test
The full test — automatic overseas tests, automatic UK tests, sufficient ties with their exact day bands, the deeming rule, and exceptional-circumstance and transit-day adjustments. Split-year treatment covers all 8 RFIG21000 cases, with their priority rules and permitted-limit tables, verified against the HMRC manual.
- ✓Automatic overseas & UK tests
- ✓Sufficient ties, exact day bands
- ✓All 8 split-year cases
HMRC RDR3 · RFIG21000–21280
US
US Substantial Presence Test
The actual 3-year weighted formula — current year's days, plus a third of last year's, plus a sixth of the year before — computed in scaled integer arithmetic to avoid the floating-point rounding errors that misplace someone right at the boundary.
- ✓3-year integer-weighted formula
- ✓Exact boundary arithmetic
- ✓Current + prior/3 + prior2/6
IRS Pub 519 — Substantial Presence Test
Schengen
Schengen 90-in-180
The 90-days-in-any-180 rolling window, tracked as one pooled allowance across the whole Schengen area — not per-country — with both entry and exit days counted, matching how the regulation actually defines the rule.
- ✓One pooled 90/180 window
- ✓Entry and exit days both count
- ✓Tracked across the full area
Regulation (EU) 2016/399, Art. 6(1)(b)
Honesty
Honest by design
For countries without a dedicated engine, the app falls back to a generic day count. For the specific countries where a flat rule is known to be wrong — Schengen members, Cyprus, Ireland — it shows the day count but withholds the residency verdict, rather than mislead.
That state is labelled "Estimate only," with a plain caveat: we can't give a reliable residency status for this country yet. Showing a number is easy. Showing a trustworthy one is the point.
Estimate only
Everything else
Everything else you need
Threshold alerts
Opt-in local notifications fire when your headroom in any jurisdiction — including the pooled Schengen allowance — crosses 10, 5, or 3 days remaining, and re-arm automatically if you recover above a crossed boundary. On-device only, never a remote push.
Pro
What-if trip planning
Test a hypothetical trip before you book it. Planned trips are merged only for evaluation — they never touch your real log, cloud sync, exports, or alerts — and run through the exact same tax engines as live evaluation.
Pro
Accountant-ready PDF report
An export built for your adviser: verdicts with confidence tiers, day counts, split-year detail, the Schengen window, a full per-trip log, cited statutory sources per section, and a not-advice disclaimer footer.
Pro
CSV export
A clean export of your trip log — country, arrival, departure, nights, source, and note — one row per stay, ready for a spreadsheet or your own model.
Pro
Cloud sync
Sync across your devices via Supabase, with row-level security so only your account can ever reach your data. Auth sessions live in your device keychain, never in plaintext.
Pro
Location privacy
Opt-in, on-device location tracking: raw GPS is converted to a country entirely on your device, offline — only the date and country are ever stored, never your raw coordinates. Manual entries always take precedence.
Privacy
One trip timeline
A chronological log of every stay you've entered, per country — the same record every engine verdict, PDF export, and CSV export is computed from. Visible and editable, not a black box.
Free
Privacy
Private by default
- Location tracking, where used, is opt-in and on-device.
- Only the date and country are ever stored — never your raw coordinates.
- Manual trip entries always take precedence over auto-detected ones.
- Cloud sync, if you turn it on, runs on row-level security — only your account can ever reach your data.
Pricing
Pricing
Free
The full tax engines and real verdicts for every supported jurisdiction — never paywalled.
- ✓The full UK Statutory Residence Test
- ✓The full US Substantial Presence Test
- ✓The full Schengen 90-in-180 tracker
- ✓Your trip timeline, always visible and editable
Pro
The operational layer around your verdict. Launch pricing for the waitlist — announced when Pro opens up.
- ✓Cloud sync across your devices
- ✓Threshold alerts at 10, 5, and 3 days remaining
- ✓What-if trip planning
- ✓CSV export and the accountant-ready PDF report
Starts with a 14-day free trial.
Questions
Questions, answered
Know where you stand, before you book the next flight.
Join the waitlist to be notified when Pro and the public release open up. No spam, and nothing sent without you asking for it.