Anti-Fraud Tip Calculator

Performs regular tip and split calculations with a twist, it also prevents credit card fraud. You can easily spot fraud and mistakes on your credit card statement by applying the anti-fraud schemes. It's simple, effective, and your preferences are saved for easy reuse.

Download

Anti-Fraud Tip Calculator

Performs regular tip and split calculations with a twist, it also prevents credit card fraud. You can easily spot fraud and mistakes on your credit card statement by applying the anti-fraud schemes. It's simple, effective, and your preferences are saved for easy reuse.

Download

Anti-Fraud Tip Calculator

Performs regular tip and split calculations with a twist, it also prevents credit card fraud. You can easily spot fraud and mistakes on your credit card statements by applying the anti-fraud schemes. It's simple, effective, and your preferences are saved for easy reuse.

Download

How does anti-frauding work?

By adjusting your charge amount using one of the algorithms below, you can detect if it's been tampered with as it'll break the algorithm. Simply verify your restaurant charges when you reconcile your bills at the end of the month. More reading on restaurant checksums.


Algorithms Explained

Disabled: Secure Mode is turned off so the total is not altered.
Checksum: The sum of the dollars matches the cents.
Mirror (Palindrome): The total is the same when read from either direction.
Pairs: The sequence of cents matches the sequence of dollars.
Rounding (Not Secure): The cents round up to 0.

A worked out scenario

If your meal bill is $10 and you gave a $2 tip, your charge amount would be $12. Now if the waiter changed the 2 to an 8, you may not recognize a month later that this $18 charge was incorrect. Let's apply the "Pairs" algorithm in this example. By giving a tip of $2.12 instead of $2, your charge amount is now $12.12. Because the 12 dollars is paired to the 12 cents, if you saw an $18.12 charge, you'd know it was tampered with. The "Checksum" algorithm is more subtle and secure but requires a little more mental math. AFTC figures out the math so you don't have to.

FAQ


What phones has this been tested on?: Nexus one, Droid, G1, Samsung Behold 2.

When I get a bill and want to calculate tip and/or split it, I only look at the final value, not the meal value and the tax value, why did you add the tax field? True, me too, in that case leave tax at zero and enter only your total amount. Some people feel that the tip % should be on top of the meal instead of the meal and tax.

I don't think it makes sense that your Anti-fraud mode applies to the Total, but not the split. Here's my thought process, there's usually one credit card payer, and everyone else pitches in cash. Anti-frauding the split mode doesn't help for cash purchases. If you really want to anti-fraud the split number, re-enter it as the meal amount. Also, you should anti-fraud all your purchases so you can correctly reconcile at the end of the month. If you anti-fraud your friend's split at dinner, it doesn't really help unless they remember at the end of the month that only that dinner was anti-frauded.





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Algorithm Table


Checksum Formulas