TaxDay and Days Monitor both track your days automatically by GPS, but TaxDay is built tightly around US state tax residency while Days Monitor casts a wider, international net. Here is a fair head-to-head, with every claim about either app quoted directly from its own App Store listing, linked and dated (checked 4 June 2026).
Positioning
TaxDay frames itself around the complexity of US state rules:
"The US tax code is over 50,000 pages long. With TaxDay, you'll be able to easily monitor your travel with GPS against every US state residency tax code."
— TaxDay, App Store (accessed 4 June 2026)
Days Monitor frames itself globally:
"Days Monitor. The Most Complete Global Residency and Travel Day Tracker."
— Days Monitor, App Store (accessed 4 June 2026)
How they track
Both run silently in the background from GPS. TaxDay:
"It runs silently in the background, using your phone's GPS, and a comprehensive database of state-by-state residency tax rules, to securely track travel."
— TaxDay, App Store (accessed 4 June 2026)
Days Monitor records automatically too and logs multiple countries on a single day:
"Cross a border in the morning and again in the afternoon? Days Monitor logs each country separately for the same date, with its own pin, time, and city."
— Days Monitor, App Store (accessed 4 June 2026)
Where TaxDay is stronger
TaxDay has one feature neither Days Monitor nor most rivals list: receipt management for audit records.
"Receipt management: Attach receipts to your travel records for thorough record-keeping."
— TaxDay, App Store (accessed 4 June 2026)
It also has threshold alerts ("Threshold notifications and alerts"
), report export ("Travel record export"
), and a public track record: the App Store shows 3.9 stars from 64 ratings. If attaching receipts to your travel log matters for your audit prep, that is a real TaxDay advantage.
Where Days Monitor is stronger
TaxDay's listing centres on US states and, for travel abroad, tracking "over 150 countries,"
but it does not describe a Schengen 90/180 calculator or Canadian provincial rules. Days Monitor adds both, plus custom rules for any country:
"Best-in-Class Schengen Tracking ... 183-day tax residency rules ... US state statutory residency tests ... Canadian provincial residency."
— Days Monitor, App Store (accessed 4 June 2026)
It can also rebuild past travel from photos ("Scan your photo library and Days Monitor recreates it from your GPS-tagged photos, processed entirely on your device"
) and exports in two formats ("Instant PDF and CSV Reports"
).
Price and platform
TaxDay is a paid subscription: its listing states a "risk-free 45-day trial,"
then "$9.99 per month,"
and requires "iOS 15.6 or later."
Days Monitor is free to download. TaxDay has the longer review history today (64 ratings) while Days Monitor is new with none yet.
Which should you choose?
- US multi-state focus, with receipt-keeping: TaxDay is purpose-built for this and uniquely lists receipt attachment.
- You travel to Europe or want custom country rules: Days Monitor adds Schengen 90/180 and Canadian provincial tracking that TaxDay's listing does not describe.
- You prefer free to start and PDF reports: Days Monitor is free to download and lists PDF and CSV export.
If your tax life is firmly US-state and you like keeping receipts attached, TaxDay fits well. If it spans Europe and other countries, Days Monitor covers more ground. Both build the automatic, GPS-based record that a residency position needs.
Specs at a glance
| TaxDay | Days Monitor | |
|---|---|---|
| Price | $9.99/mo | Free to download |
| Free trial | 45 days | — |
| Platform | iPhone (iOS 15.6+) | iPhone, iPad, Mac (via iCloud) |
| App Store rating | 3.9 (64 ratings) | New (no ratings yet) |
| Reports | Travel record export | PDF + CSV |
Figures from each app's App Store listing or website, accessed 4 June 2026; see the quoted sources above and in Sources.
Sources
- TaxDay, App Store (accessed 4 June 2026)
- Days Monitor, App Store (accessed 4 June 2026)
Frequently Asked Questions
Is TaxDay or Days Monitor better for US state residency?
Does TaxDay track the Schengen 90/180 rule?
How much does TaxDay cost versus Days Monitor?
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