Why I Built Rectifi
The problem with card centering apps — and what I did about it.
Card centering was the one thing I knew could be done well with an app.
I tried a popular centering app on the App Store, and honestly, I think it's pretty good at what it does. It just led me to some deceiving results.
Not because of how the app was built. Because of how I was using it.
If you're browsing listings online and want to know whether a card is centered well, you're working with whatever photo the seller posted. And those photos are almost never perfectly flat. They're tilted, shot at odd angles, or taken from across a table.
So the centering numbers you get back? They can be off. And if you're using those numbers to decide whether to buy a card and send it to grading, you're making a decision based on misleading data. That's an expensive mistake.
What I Built
Today, I'm sharing an app I've been building and testing for a while: Rectifi.
Rectifi automatically corrects for perspective. Tilted photo? Odd angle? Seller's listing image taken from across the room? It straightens the card first, then measures centering, so the ratios you get back are actually reliable.
I bought a caliper and a ruler during development to verify the app's measurements by hand. The caliper was finicky and could easily damage a card, and the ruler had me squinting at half-millimeter lines. It confirmed two things: Rectifi's numbers are accurate, and nobody should have to measure card borders by hand.
I hope you enjoy using Rectifi as much as I have. Let me know what you think in the app or at support@getrectifi.com. Happy card hunting!