Perf: Stamp Identifier & Value

Perf identifies stamps, tells you how sure it is, and keeps your collection. No account. No ads. Nothing leaves your phone but the photo you choose to scan.

TRY IT BEFORE YOU PAY
Five identifications a day, every day, on the standard plan — plus a full album page scan every month. You will know whether Perf works on your stamps before it ever asks you for money. Most scanner apps give you two scans and then a price. That is not how you buy a tool.

IT TELLS YOU WHEN IT ISN'T SURE
Every identification comes with an honest attribution: confident, or likely-and-worth-verifying, with the reason stated plainly — perforation, centering, a variety that needs a second look. When Perf is unsure it shows you the alternatives instead of one confident guess. An identifier that is quietly wrong is worse than one that admits it.

SORT A WHOLE PAGE AT ONCE
Photograph an album page or a stockbook sheet and Perf finds every stamp on it, identifies each one, and lays them out for you to confirm or correct together. Inherited a collection? This is the difference between an afternoon and a winter.

IT WILL NOT INVENT WHAT YOUR STAMP IS WORTH
Perf does not price stamps. No catalog publisher is licensed to it, so rather than guess at a figure it says so plainly and leaves the appraising to appraisers. Identifying a stamp, measuring its perforations and keeping your album do not depend on a price. Nobody's stamp is worth more because an app said so.

A REAL ALBUM, NOT A SCAN HISTORY
Stamps mount in pages by country. Record condition, quantity, notes and how you came by each one. Sort, search your own collection in plain words, mark duplicates for trade, keep a want list and get told on the review screen when a new scan fills a gap. Everything syncs privately across your own devices through iCloud, with no login, ever.

THE COLLECTOR'S TOOLS, ON SCREEN
A perforation gauge you lay your own stamp against, calibrated to your screen so the teeth measure true. Your measurement, not Perf's guess, and often the thing that settles an attribution. Condition grading suggested from your photo with the cues it used. Variety, overprint and postmark reading. Plain-language explanations of the philatelic terms Perf uses, for anyone who has just inherited an album and does not yet speak the language.

PERF PRO
The standard plan keeps working forever, and anything you have mounted stays yours. Pro adds unlimited identifications, unlimited page scans, a collection-wide insight report and CSV export. One year, or one payment for good.

Questions or requests: https://scalingwebapps.com/contact.php

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This app offers an auto-renewable subscription. Payment is charged to your Apple Account at purchase confirmation. It renews automatically unless turned off at least 24 hours before the current period ends; your account is charged for renewal within 24 hours before the period ends. Manage or cancel anytime in your Apple Account settings. Prices may vary by region. A one-time lifetime purchase is also available.

Privacy Policy: https://scalingwebapps.com/policies/perf-privacy-policy.php
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/