Photocaliper measures boxes with the phone you already have. Print a free mat on regular paper, take one photo, and get exact dimensions plus what UPS, FedEx, or Amazon will actually charge. Works on any phone, including Android. No LiDAR needed.
Free for 10 scans a month when it launches. The waitlist gets the beta first.
Since August 2025, UPS and FedEx round every fraction of an inch up. You pay for the box you didn't ship.
Refunds that carriers hold and shippers never claim, much of it from dimension errors.
Every measurement comes with its own margin of error, so you know when to trust it and when to re-shoot.
how it works
The mat is the trick. A border of printed markers gives your camera a precise scale reference, which is the job LiDAR does on a $1,200 phone. Paper does it for free.
A free PDF on regular paper. Lay a credit card on the printed outline to confirm your printer didn't shrink it. Tape it to any flat surface.
Set the item on the mat, or beside it if it's big. Shoot from an angle. The app guides your framing and warns about glare.
Length, width, and height with a stated margin of error, the billed size after carrier rounding, and your Amazon size tier. Saved with the photo as evidence.
the boundary flag
Carriers bill in whole inches. When a side measures 11.9 inches with a 0.2 inch margin, the honest answer is "too close to call," and Photocaliper says so. It asks for one more photo instead of guessing.
You find out before the carrier's scanner does. If their measurement disagrees with yours, you have a timestamped photo and a stated margin of error to dispute it with.
for catalog sellers
Connect your store and Photocaliper compares measured dimensions against what your listings, your warehouse, and your carrier invoices claim. Each mismatch gets a dollar figure per month and is ranked by what it costs you.
Your staff do the scanning with their own phones. The dispute packet, with photos, timestamps, and margins of error, assembles itself.
pricing
Planned pricing at launch. Waitlist members lock the launch price for a year.
questions
Within about 5 mm (0.2 inches) on box-shaped items, and every measurement states its own margin of error. Carriers bill in whole inches, so that is enough to know your billed size, and the app tells you when a side is too close to a boundary to call.
No. The printed mat gives the camera its scale reference, which is what LiDAR hardware provides on Pro iPhones. Any phone with a camera works, including budget Androids.
A photo alone has no sense of scale: a big box far away and a small box up close look identical. The markers on the mat are a known size and pattern, so the app can work out exactly where your camera is and measure against it.
Boxes first, because carriers bill on the box. Support for irregular items is planned after launch.
Beside the mat, on the same surface. The mat only needs to share the surface with the item, not hold it.
The measurement engine works today and is validated to ±5 mm on synthetic tests. The app is in development now. Waitlist members get the beta first and keep launch pricing for a year.
Leave an email and you'll get the beta before anyone else. Nothing else is sent to it.
About 30 seconds, no card, unsubscribe any time.