Daysium Alternative: Tax Days vs Daysium Compared (2026)
Daysium and Tax Days solve the same problem, proving where you were on which day, but they are priced for different people. Daysium is a membership product aimed at high-net-worth individuals and the family offices and trustees who advise them, starting at £1,200/year for a single jurisdiction. Tax Days is a $29.99/year iPhone app that covers all 200+ jurisdictions at once. Here is the head-to-head. (Daysium pricing below is its published rate as of September 2026, confirm the current figure on daysium.com before buying.)
Pricing at a glance
Tax Days
Privacy-first iPhone app. No accounts, and your travel history never reaches our servers. Optional iCloud sync through Apple's CloudKit.
Daysium
UK-built tax residency and day-counting platform for high-net-worth individuals and their advisers, combining automatic GPS logging, geo-tagged photo evidence, and a concierge service, sold on annual memberships that start in the four figures.
Feature comparison
| Feature | Tax Days | Daysium |
|---|---|---|
| Annual cost | $29.99/year, all rules included Yes | £1,200 (Professional) to £10,000+ (Family Office), as of September 2026 |
| Jurisdictions included | All 200+, no tier limits Yes | 1 on Professional, up to 3 on Private Client, up to 5 on Platinum |
| Free tier | Yes Yes | No, 14-day trial then membership |
| Tracking method | Automatic low-power tracking or manual entry | Automatic GPS logging |
| Location tracking optional | Yes, you can log trips entirely by hand Yes | GPS logging is the core of the product |
| Data location | On your iPhone + optional iCloud Yes | Daysium's platform |
| Evidence capture | Contemporaneous day log, exportable | Day log plus geo-tagged photo evidence |
| Human concierge | No, self-serve | Yes, on Private Client and above |
| Adviser / family-office portal | No | Yes, Daysium Portal from Private Client up |
| US state rules | All 50, with state-specific tests Yes | Configurable rules, not a packaged 50-state set |
| Schengen 90/180 | Yes | Configurable as a jurisdiction rule |
| UK SRT | Yes | Yes, UK is its home market |
| Platform | iPhone (iOS 17+) | iPhone and iPad, plus the Daysium Portal from Private Client up |
Which one is right for you?
Tax Days is best for…
- Anyone who wants every jurisdiction included instead of paying per tier.
- People who want the option to track without handing over continuous GPS.
- Individuals without an adviser, family office, or trustee in the loop.
- Anyone for whom £1,200/year is out of proportion to the tax at stake.
Daysium is best for…
- High-net-worth individuals who want a concierge to review the record with them.
- Family offices and trustees managing several people from one portal.
- Anyone who wants geo-tagged photo evidence attached to the day log.
- Families who want governance and continuity rules, or data residency outside the UK.
Bottom line: Daysium is a premium, advised service and prices accordingly: as of September 2026, £1,200/year buys one jurisdiction, and covering three costs £2,500. Tax Days covers every jurisdiction for $29.99/year and keeps the data on your phone. If you want a human reviewing your position and a portal your trustee can log into, Daysium is built for that. If you want the day count itself, correct and defensible, Tax Days does the same job for a fraction of the price.
Frequently asked questions
Is Daysium or Tax Days better?
It depends on whether you are buying software or a service. Tax Days is a $29.99/year iPhone app that runs the day count for every jurisdiction and keeps your data on-device. Daysium is a membership starting at £1,200/year that adds geo-tagged photo evidence, plus a concierge service and an adviser portal from its Private Client tier. For the day count alone, Tax Days is far cheaper and covers more jurisdictions out of the box.
How much does Daysium cost?
As of September 2026 Daysium publishes these annual memberships: Professional at £1,200 (one licence, one tax jurisdiction), Private Client at £2,500 (up to three jurisdictions, the Daysium Portal, and its Concierge Service), Platinum at £5,000 (two licences, up to five jurisdictions), and Family Office from £10,000 (four licences and its full jurisdiction library). Enterprise is priced on a call. Professional, Private Client, and Platinum come with a 14-day trial. Check daysium.com/pricing for the current figures.
Daysium vs Domicile365: which should I pick?
They sit at opposite ends of the market. Domicile365 is a consumer-priced app ($19.99/month as of September 2026) built around automatic day counts by country, state, and city. Daysium is a four-figure UK membership aimed at high-net-worth individuals and their advisers, with concierge support and a family-office portal. Tax Days costs less than either and packages US state and international rules in one app, so it is worth comparing all three.
Does Daysium require GPS tracking?
Automatic GPS logging is central to how Daysium builds its record, and its App Store listing says your phone's GPS captures location data automatically. Tax Days includes automatic background tracking free but treats it as optional: it uses significant-change monitoring rather than continuous GPS, proposes trips for you to confirm, and works perfectly well if you log every trip by hand instead.
Which app keeps my location data more private?
Tax Days stores everything on your iPhone with optional iCloud sync through Apple's CloudKit, so your location history never reaches our servers. Daysium is a hosted platform: your location log and photo evidence live on its infrastructure, which is what makes the concierge review and adviser portal possible.
Does Daysium cover US state residency rules?
Daysium supports configurable jurisdiction rules and counts days against thresholds you set, but it is a UK-founded product and does not ship a packaged set of all 50 US state tests. Tax Days includes all 50 states with their specific rules (New York's 184-day rule, the statutory-residence tests in NJ, MA, CT, and PA, and so on) plus the federal Substantial Presence Test.
Compare Tax Days with other trackers
Ready to try Tax Days?
$29.99/year. No accounts. No ads. Free tier included.