Naturalize

For green card holders preparing Form N-400

Every day abroad, counted the way USCIS counts.

Naturalize keeps a private record of your trips outside the US, shows your estimated earliest filing date with its working, and has your N-400 travel table ready when you file.

Download on the App Store Try the day counter
  • No account
  • Nothing leaves your iPhone
The Progress screen: estimated earliest filing date December 14, 2026, with 1,434 counted days of 913 needed.
The Records screen: seven trips to list on N-400 Part 8, most recent first.
913

days in the US to file on the 5-year route

548

days on the 3-year route, for spouses of US citizens

6

rows on Part 8, with the rest moved to Part 14 for you

0

accounts, servers, ads or trackers

How it counts

The days you leave and return are days in the US.

Spreadsheets and travel trackers often count them as days away. Over five years of trips, that adds up. Naturalize counts the way the USCIS Policy Manual does, and checks every trip against the lines that matter.

“USCIS will count the day that an applicant departs from the United States and the day he or she returns as days of physical presence.”

USCIS Policy Manual, Volume 12, Part D, Chapter 4

Try it with a trip

8days abroad

Jun 1, 2026 and Jun 10, 2026 count as days in the US, so only the 8 days between them count as abroad.

Nothing to flagTrips under 150 days don't raise a note. They still count against your physical presence.

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Your filing date

One date, with its working shown.

Your estimated earliest filing date is the latest of everything that applies to you. Naturalize lists each one with its own date and marks the one that sets yours.

  • Your anniversary, less 90 days. USCIS accepts filings up to 90 days early.
  • Enough days in the US. 913 on the 5-year route, 548 on the 3-year route.
  • 3 months in your state. No early filing for this one.
  • Your marriage dates on the 3-year route, and the wait after any absence of a year or more.
How we count: your window, days abroad subtracted, and the dates that set your filing date.

Long trips

Flagged early, and explained calmly.

Every trip is checked against the lines that matter for continuous residence. Each note says what it means, what it doesn't mean and what to do next. Every warning is free.

150–180
Review. Close to 6 months. Nothing moves, but it's worth checking the dates.
181–364
Important. USCIS presumes a break in continuous residence unless you show otherwise.
365+
Serious. Continuous residence is broken, and your earliest filing date moves.
A 160-day trip to India marked Review, with what it means, what it doesn't mean and the next step.

Form N-400, Part 8

Your travel table, ready to paste.

Part 8 asks for every trip in the last five years. Naturalize builds it the way the form asks for it, so filing night isn't spent digging through old boarding passes.

  • Date left, date returned, where you went. Most recent first.
  • Day trips left off when you were back within 24 hours, and kept if you're not sure.
  • Past six rows? The rest are moved onto Part 14 for you.
  • Export a PDF or a copy-ready list for the paper or online N-400.
Seven trips to list: six fit on the form, one continues on Part 14, one day trip left off.

Plan a trip before you book it.

Pick the dates and see what they change: days abroad, your longest absence, and whether your filing date moves. It even tells you the latest return date that keeps you under 150 or 180 days.

Then share a clean card with family. Citizenship details stay off it unless you turn them on.

Plan a trip: 13 days abroad, and the estimated filing date stays December 14, 2026.
Share plan: a trip card with leaving and return dates and 14 nights away.

Privacy

Your travel history stays yours.

Where you've been is personal. Naturalize keeps it on your iPhone and nowhere else, and it never asks who you are.

No account

Open it and start. No sign-up, no email, no password.

No server

Your trips live on this iPhone, protected by iOS data protection.

No tracking

No ads, no analytics and no third-party code in the app.

No identity data

It never asks for your name, A-Number, passport number or address.

Face ID lock

Lock the app with Face ID or your passcode, and cover it in the app switcher.

Backups you hold

Export a backup file any time and keep it wherever you like.

App Store privacy label: Data Not CollectedThe plain-language version is short, and worth reading.

Read the privacy policy

Questions

Good to know.

Is Naturalize legal advice?

No. Naturalize calculates from what you enter and shows its working, but it can't decide eligibility. It can't check good moral character, English and civics, or whether a presumption has been rebutted. Check uscis.gov or talk to an immigration attorney before you file.

Is it affiliated with USCIS?

No. Naturalize isn't affiliated with USCIS or any government agency. It follows the published USCIS Policy Manual and the Form N-400 instructions, and cites them in the app.

Does it work for the 3-year route?

Yes. If you're married to a US citizen, Naturalize counts against 548 days and includes your marriage dates in the filing-date estimate.

Where is my data stored?

Only on your iPhone. There's no account and no server. Your record moves to a new iPhone with a normal backup and restore, and you can export your own backup file at any time.

What if the rules change?

The rules only change with an app update. The app shows when its rules were last reviewed, and tells you if they're getting old.

More answers on the support page.

Know where you stand
before you file.

Add your trips once. Naturalize keeps the count, flags the long ones and has your N-400 table ready.

Download on the App Store hello@ozar.io

For iPhone, iOS 18 or later.