About this app
What Stampr does
Free to download. The full passport, map, stamp collection, visit logging, photo-attached visits, automatic park-visit detection, and offline browse of every NPS unit all ship in the free tier. Pro is an optional upgrade that unlocks unlimited photos per visit, a printable PDF passport book, AI-customized stamp art, calendar heatmap + regional stats, and high-priority geofence monitoring — no required subscription. Stampr is a privacy-first digital passport for the 423 parks, monuments, seashores, and historic sites that belong to all of us — modeled on the physical Passport To Your National Parks program every visitor center sells. A keepsake, not a checklist. What's inside: — Beautiful collectible stamps: every visited park renders as a full-color cancellation stamp; unvisited ones wait in grayscale silhouette until you arrive. The stamping moment — a real "stamp pad pressing down," haptic, ink-spread cancellation date — is the heartbeat of the app. — Automatic visit detection: when your iPhone notices you've spent 30+ minutes inside a park boundary, Stampr asks once: "Did you just visit Yellowstone?" No always-on tracking, no nags — one prompt per park per month at most. — All 433 NPS units offline: every park's photo, description, hours, fees, region, and boundary ships in the app. Plane mode, basement, broken Wi-Fi at the school — Stampr still works. — Log a visit in 30 seconds: date (pre-filled), up to 10 photos referenced from your Photos library (never duplicated), free-text notes. Stamping animation triggers on save. — Map view: every NPS unit on the map, with visited / unvisited / want-to-visit filters and cluster zoom. — Stats dashboard: progress against the all-63 challenge, states visited, regions completed, longest streak, longest gap, most-visited park. — PDF passport export: one beautiful page per visited park — cover, stamp, photos, notes, date — printable as a real book. — Apple Watch complication: "X / 63 parks" on your wrist. — Privacy posture: location stays on your iPhone. No account, no email, no analytics SDK, no third-party tracker. The truthful App Store privacy label is "Data Not Collected."
Features
Built to be useful, not noisy.
Collectible stamps
Every visited park renders as a full-color cancellation stamp; unvisited ones wait in grayscale silhouette. The stamping animation — real pad press, haptic, ink-spread date mark — is the moment the app earns its keep.
Auto visit detection
iPhone's passive visit API notices you've spent 30+ minutes inside a park boundary and asks once: "Did you just visit Yellowstone?" One prompt per park per 30 days. No always-on tracking.
All 433 NPS units offline
Every park, monument, seashore, and historic site ships in the app — photo, description, hours, fees, boundary. Works on airplane mode, in basements, anywhere your iPhone wakes up.
Map + Discover
MapKit view with visited / unvisited / want-to-visit filters and clustering. Discover tab surfaces nearby parks, all-63 challenge, Junior Ranger eligible, dog-friendly units, and the 7 NPS regions.
Stats + progress
Progress ring vs the all-63 challenge, total unique units, states visited (US map fill), regions completed, longest streak, longest gap, most-visited park, calendar heatmap of every visit.
PDF passport export
One beautifully-laid-out page per visited park — stamp, photos, notes, date — plus a cover with your stats. UIGraphicsPDFRenderer at 600dpi, ready to print as a real book.
Privacy by default
Location data never leaves your iPhone. No account, no email, no analytics, no third-party trackers. Photos are referenced from your Photos library by identifier — Stampr never copies your images.
Why it exists
The problem
318M Americans visit a National Park every year and millions buy the physical Passport To Your National Parks book at visitor centers. There is no calm, beautifully-designed, privacy-respecting iPhone equivalent — existing apps are either subscription-locked, ad-supported, or built around badges and streaks instead of the joy of the stamp itself.
What's different
How Stampr stands out
Stampr treats the stamp as the product, not the metadata around it. Hand-designed cancellation artwork per National Park, a stamping animation worth opening the app for, automatic visit detection that asks once and stays quiet, all 433 NPS units browsable offline, and zero data ever leaving the device. The free tier is the full passport — Pro is an optional add-on, not a paywall around the core experience.
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FAQ
Questions about Stampr
How much does Stampr cost?▾
Stampr is free to download. Core features work out of the box. Some advanced capabilities are available via optional in-app upgrades — there's no required subscription to use the app.
Where does Stampr store my data?▾
On your device. Stampr is built privacy-first: no account is required, no analytics SDKs, no third-party trackers. Nothing is uploaded to a server we control — the app works without one.
What platforms does Stampr support?▾
iOS, on iPhone and iPad. You can find the latest availability on this page.
How do I get support for Stampr?▾
Use the Support link on this page, or email support@allthingsn.com. We answer every message and keep responses on the same thread.
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