Frequently asked questions

Stampzy is an iPhone app that stamps the date, time, GPS coordinates and the new-structure Vietnamese address onto photos and videos the moment you take them, made by Đào Văn Thương, an independent developer in Vietnam.

Stampzy stamps the date, time, GPS coordinates and the new-structure Vietnamese address onto photos and videos the moment you take them. It works offline, computes the commune and province of Vietnam's post-1 July 2025 structure (34 provinces, no district) on the phone, and comes with templates, attendance timesheets and daily photo reports for field work such as construction, delivery and customer visits.

Stampzy is made by Đào Văn Thương (Dao Van Thuong), an independent iOS developer in Vietnam. There is no company or investor behind it.

Yes. Stampzy ships boundary data for the 34 provinces and 3,321 communes and wards of the structure in force since 1/7/2025, with no district level. Commune/ward and province are worked out on your iPhone from the GPS fix. Online, the app may add the house number and street from Apple's map service; if that service still returns an old commune or province, Stampzy keeps the new-structure result. Right at the boundary between two communes the result depends on GPS accuracy — check the address line on the viewfinder before you shoot.

Yes. Capture, stamping, coordinates and the commune/province address all work offline. Without a connection there is no house number or street. If network time was checked in the last 24 hours the stamp still says “Verified time”; otherwise it says “Device time”.

No. Stampzy has no account, and no server of ours receives your photos. Photos, videos and reports are made and stored on your iPhone and leave it only when you share them. The only things that go over the network are: coordinates sent to Apple's map service for the street address (when online), a time check against a few large public web servers (carrying none of your data), Pro purchases through RevenueCat with an anonymous ID, anonymous usage statistics to Google Analytics for Firebase (which features are used) and crash reports to Firebase Crashlytics — never photos, locations or text — plus feedback, only if you write it in “Feedback & bug report” and tap Send.

Stampzy reads the time from a few large web servers and remembers how far the device clock is off. For the next 24 hours, as long as the clock is not changed, the stamp uses network time and says “Verified time” — even with no signal when you shoot. Outside that window it plainly says “Device time”.

No. The photo code is a consistency code that helps you match a photo against your own records. It is not a tamper-proof certificate, and Stampzy is not a tool for producing legal evidence.

No. They scan the QR in the photo's corner with the iPhone camera or Zalo's scanner, and a web page opens with the time it was taken, the address, the coordinates and directions. The QR holds only what the stamp prints; the details sit after the # of the link, so the browser never sends them to a server, and the page has no analytics. Anyone can make a link like this, so the page does not confirm a photo is genuine.

No limit on the number or quality of photos. You get 3 templates (Attendance, Construction / Acceptance, Custom), and photos carry a small “Scan for location” QR in the corner (or the word “Stampzy” when the stamp prints no address or coordinates). Video, logo, the photo code and the other 9 templates are in Stampzy Pro.

The yearly plan has a 3-day free trial for eligible new subscribers. Cancel in Settings › [your name] › Subscriptions › Stampzy at least 24 hours before the trial ends and you will not be charged. Lifetime is a one-time purchase with nothing to cancel.

Stampzy is for iPhone on iOS 17 or later only. Outside Vietnam it still stamps the time and coordinates as usual; the address then comes from Apple's map service, so it needs a connection.

The iPhone Camera always stores the capture date and time in the photo's hidden metadata, and stores the location if the Camera may use it (Settings → Privacy & Security → Location Services → Camera → While Using the App). Metadata is often stripped by messaging apps, so if the recipient needs to see it, put the date and place on the image itself, with Markup or a timestamp camera.

Yes. Read the original time and place by swiping up on the photo in Photos, then write exactly that onto a copy. Stampzy has batch stamping (in Stampzy Pro): it reads the time and location stored in each photo, the stamp says “Photo time”, and the originals are not modified.

Under open sky, phone GPS is usually within a few metres; indoors, in a basement or between tall buildings it can be tens of metres off. Open the camera and wait a few seconds before shooting. Coordinates on a phone photo locate a place; they do not replace survey equipment.

They take the address from a map service, and map services update administrative data on their own schedule. Since 1 July 2025, Vietnamese addresses have only two levels: commune/ward and province/city. Stampzy works out the commune and province from the new boundary data bundled with the app, so its stamp has no district.

No. The iPhone Camera only stores the date, time and location in a photo's hidden data, which you can see by swiping up in Photos. That data is often stripped by messaging apps. If the recipient needs to see it, write it on the photo with Markup or use a timestamp camera.

The iPhone Camera shows no clock on video; the recording time is only in hidden data. Without an app you can start the clip on a clock or say the date and time aloud. Stampzy Pro records stamped video with a clock ticking every second.

Because photos take their time from the phone's clock. If Settings → General → Date & Time → Set Automatically is off or the time zone is wrong, every photo carries the wrong time. Stampzy says “Device time” instead of “Verified time” when it could not check the clock against network time.

Set Settings → Camera → Formats to Most Compatible so new photos are JPG, paste existing photos into the Files app to get JPG copies, or set Settings → Photos → Transfer to Mac or PC to Automatic. In Stampzy you choose HEIC or JPEG in Settings.

Yes, on iOS 18 and later: add the Stampzy Camera control to Control Center, a Lock Screen button or the Action button. Photos taken while locked still have the time and commune/ward and province; there is no logo and no video from the Lock Screen.

Yes. Stampzy has a lunar date field, computed on the phone, that you can switch on in the free version. The Baby and Travel templates in Stampzy Pro have it on by default.

No. Stampzy is a camera for one person at a time: each person checks in with photos and keeps their timesheet on their own iPhone. There is no server, no account and no team dashboard. It suits mobile workers and small teams who send their photos and timesheets to whoever does payroll.

Excel (.xlsx) and PDF. The Excel file has hours as numbers you can add up, flags for late arrivals, early leaves and missing check-outs, and a detail sheet with every entry's address, coordinates and photo code. Exporting the current week is free; exporting a whole month is part of Stampzy Pro.

Combine the day's photos into one image or one PDF in time order, and send the summary as a separate text message, because Zalo often drops text shared together with an image. Stampzy makes image reports of up to 4 photos in the free version; PDF and larger reports are part of Stampzy Pro.

Yes. The author locks lines such as the project name and contractor, then sends the template on Zalo as a link, a .stampzy file or a QR card. Receivers add it in one tap; using a shared template is free and needs no account.

Yes. Without an app, add it with Markup in Photos or with the Overlay Image action in Shortcuts. In Stampzy the logo is a stamp field and part of Stampzy Pro; people who receive a shared template use the sender's logo for free.

One album per site or customer in Photos, named in a fixed pattern, with photos added the same day. In Stampzy, selecting a project on the camera files new photos into it; the free plan has one project.

Four to six photos per outlet in the same order: storefront, shelf, your products close up, prices and issues, each with the date, time, address and customer on the photo. Send one combined image and one summary message instead of loose photos.

The condition before starting with the model and serial label, old and new parts, the unit running afterwards from the same angle as the before photo, and a short summary. Keep the photos at least as long as the warranty.

No. Stampzy has no accounts. Open the app, allow the camera and location, and shoot.

No. A stamped photo is the photographer's own record: the time, the place and the notes, clear and easy to check. “Verified time” and the photo code help you match a photo against your own records, but they are not a tamper-proof certificate. For acceptance, handover or disputes, photos support the minutes and documents; they do not replace them.

Photos with the date, time and place describe the condition clearly and quickly, especially when sent to the other side the same day. But they only support the handover form or the claim file; the lease, the paperwork and the insurer decide.

Once everyone is safe: the whole scene, each vehicle from four sides, the plates, close-ups of the damage, the road and signs, and the other party's documents if they agree. Follow your insurer's instructions and keep the originals untouched.