A star note or an unusual serial can be worth many times face value. It looks like ordinary money, so it gets spent.
iPhone and iPad · Works with no signal · US paper money
Every note gets a verdict and a running tally, so a bank strap takes minutes instead of an evening.
Four of these are worth pulling out of the stack. The last one is not.
Every other app in this category identifies your note by looking at a picture of it. That is why they confuse a $10 with a $20.
A US note prints everything worth knowing about itself. SerialHunt reads that text through the camera and works from what it finds, so the answer comes from the note rather than from a photograph of it.
Star note print runs back to 1974, taken from Bureau of Engraving and Printing production figures. What makes a star worth keeping is the size of the run it came from, and here it gets a real number.
Radar, repeater, ladder, solid, binary, low serial, birthday and more. Each one carries how often it actually occurs, counted across all one hundred million possible serials. Not estimates.
Each printed stretch is stored separately, not just the run totals. That is how it can tell you a serial was never printed at all, instead of quietly failing to find it.
Save what you find, grade it yourself on the standard scale, and search everything by serial, series, district or pattern. Face value totals are arithmetic on the notes themselves.
The production figures ship inside the app. No network, no account, nothing uploaded. It works in a bank queue with no signal.
No price guide for US paper money can be licensed. The catalogue numbers are copyrighted and the dealer sheets are paid subscriptions, so any dollar figure here would be invented. You get what was printed instead. Take that to a dealer or an auction record and you will know more than a made-up number would have told you.
Check the next bill you get back in change.