This app is awesome. Totally works at the stores we input and makes it so much easier than carrying all those tags on the key ring.

Finally an app that does what was originally intended for the iPhone, third party software we will use everyday.... This application works great, the latest update fixed an issue at my local YMCA and is truly a great application I will continue to use everyday.

Update - 2-18-09: downloaded new version today and it works great!! The 2 stores that could not scan now do, YEAH!! So easy to upload and how convient...no more bulky cards. Great deal for only .99 cents

What a great concept, but so far, it hasn't worked for me either. I know barcodes have different formats, (aspects), and I've match them perfectly to my cards. Now trying to adjust the size, larger to see if that will make scanners pick it up, but I"m afraid, as some reviewers have mentioned, it's the iPhone screen reflection that causes it to not work, and if that's not the case, I wonder how previous reviewers have gotten it to work, unless they have screen protectors that are not shiny. I know I've had the same problem with items in the store sometimes that have cellophane over the barcode. Same issue here, but like I said, I'm trying increased sizes to see what happens, but the jury is still out on this one. If it ever works, I will give it 5 stars.

I didn't have to tell the clerk at CVS that I forgot my card again, she just scanned my phone. Very convenient.

Great app! Waited to purchase until the new version, since then have used it at Stop and shop, Blockbuster, etc. It's awesome, I don't even carry my reward cards anymore!

As of the new update to cardstar app, I can say that it has made my daily life much easier now. I don’t have to worry about having cards in my wallet or on my keychain. All I do is load my cards into my iPhone into the cardstar app and I don’t have to worry about my cards anymore cause they are all in one place. I recommend everyone who has purchased the cardstar app to make sure you have the new version, it works perfectly you will not be disappointed. For those that have not purchased the app yet, what are you waiting for! This is the first useful app that has been developed thus far. If you are tired of looking for your cards and always having trouble scanning your cards at check out, then cardstar is the app to go with. This is the reason why I like this app. My keys would always scratch my barcodes and it made it a nightmare for me to scan my cards, but now that problem is fixed. Guess what it even scans at Best Buy and my gym membership card. Thank you whoever you for developing this app you made life just a little bit better.

So recently was turned onto this new app called Cardstar. I was a little sceptical due to the fact that I was being sold on an app that would scan bar codes from my phone. After using it several times at Stop And Shop and Best Buy, I found this app to be a very handy tool. I no longer carry any of my rewards cards and my key chain thanks me.

I have an antiglare film on my iPhone (be careful to get the one with the matte finish) and Cardstar worked perfectly at the Kroger yesterday. It didn't perform when held up to the console scanner, but the hand held scanner picked it up on the first pass.

I had high hopes for this and entering my cards was easy enough. My big complaint though us it doesn't work on the grocery store scanners ( kroger). Kind of defeats the purpose. It is still good to have as a repository for all my membership info though. One other thing that bugs me is the startup screen seems to linger too long. Don't know if that can be changed or not.

This is a great idea!!! I'm looking forward to a bug fix which will help stability and reduce the crashing. I'm also hoping they will add the following cards: -LA Fitness -Vons -24hr fitness Highly recommended app!

A nice idea, could be very useful.

Used it at CVS last night and it worked as advertised! Great app

Great idea, but I don't know how the other reviewers think that it works. It does not scan from the iPhone screen. It is too reflective. So I seem to have wasted a $1 on something that stores my numbers. But then most of them have my phone number which I just give the store to access the account. Until the reflective aspect is solved, don't waste your money.

Clearly there are developer reviews on here. Apple needs to figure out how to control this. Anyways, the technology simply does not work; you cannot scan the iphone screen with a barcode reader. A nice idea in principle, but this app does little more than store all your membership numbers.

Great app.... Wish had more options but way better than the similar apps!!

Great application! Make sure you have the latest update and you will not be disappointed. I used it at Pet Smart tonight and the cashier was so impressed.

Works great as advertised. Excellent customer support

Ease of use, elegant interface, brilliant idea. AND IT WORKS. Carrying my bonus cards in my wallet and on my keychain is really not a big deal, but scanning off my iPhone is just so much cooler. Tip for those that are having trouble scanning: had a cheap screen protector that actually blocked the scanning process, but after removing, it scanned perfectly. Have since switched to a better screen protector, and is scanning fine.

I forgot my BSC gym membership card last night becuase I only broght my smaller set of keys out with me. It saved me a trip home, and the girl at the front desk just took a look at my number on the phone and off I went to work out! thanks

Good concept. Needs a feature to upload a photo or logo for cards not on list already(GNC, Hastings, Shopco). Also needs to at least state the merchant name above the barcode if entered manually. Tried at Albertsons and it didn't work, however I had the number handy for the app and entered manually. Still kept me from carrying the plastic cards around

Put in my code for the YMCA and it gave me a nice barcode. When I went to scan at the "Y", did not work. Put in Ralph;s grocery card, did not scan from store. No response from the developer. Will be getting my money back on principle. Let me know when it works.--change to review--developer did respond and they are working on fixes.

Excellent app. Already appreciate how lighter my wallet has become. Easy to load up. Works great at checkout and beats carrying around all of those annoying cards on my keychain. Pretty slick. Good value.

Barcodes don't scan, and aren't generated right. It just doesn't work. Frustrating app for a buck.

In theory: great concept. In reality: simply doesn't work.

It works OK for the merchants listed I just wish there was a way to recommend merchants to add.

Love how it works on my Kroger card and Hallmark cards. I wish the bar card would work with my Costco and AAA card.

Superb. Codes for libraries please. Or import images capability

My Costco card somehow doesn't work for this app although it does have Costco among its merchants.

I have had mixed success with CardStar. While it does exactly what I would want it to do, it seems that some scanners have difficulty reading the bar code. The two major factors seem to be how clean the screen is and the level of brightness. I keep my screen immaculately clean but as a result, it becomes very reflective. I think the reflectivity tends to work against the app in a few cases. I read somewhere that turning screen brightness up helps. Sure enough, when I turned up the brightness, I had more success. My recommended change to this app is to allow the setting of the screen brightness, or at the very least just increase brightness to maximum whenever the codes are displayed and go back to the original setting when the application is closed.

It worked! And it got scanned so fast that the skeptic sales associate behind the counter couldn't believe it and was mega impressed! Me too! and with big relief because I left my cards at home. Great job developers! Please add more store cards :)

Only problem is costco still needs card

This app is awesome. I don't know why people are saying it doesn't work. Maybe they're not putting the card info in correctly? Works perfect for me.

I love this app. I pulled 5 cards out of my stuffed wallet. Plenty of room for cash now (I just need to get some of that LOL). I too have had problems here and there scanning, but agree that brightness makes a difference. I have a few feature requests that will make the app top notch:

Works great at giant Thanks.

It worked great thanks. I had to get a new wallet because it broke and could not fit all the cards in. This worked out great. Just needs more stores in the database

It is so nice having such a thin wallet thanks to this app. It even perfectly reproduced the barcode from my local library card - it was so easy and took mere seconds to do. & I no longer have to get new savings cards when the barcodes rub off of my keychain cards. More than worth the nothing I paid for this app!

I used of at CVS today and it scanned fine. It's great too because I would never carry a CVS card on me but I always have my iPod touch on me so they just scan it. Great app! I also can't wait to use it at Stop n Shop and Bog Y.

Looks great but I would love to see a password feature installed.

I have been using this for about a month and love it! It has worked with the hand scanners in every store I have tried (and I use a matte screen protector) Also very easy to add ones that aren't in the list.

The application works as advertised. I used CardStar at CVS with no problems. I read other reviews saying the vendor had trouble scanning their phones screen. My iPhone has a glare reducing film protector on it. It's possible that it might have helped. The next steps I see to improve this application is to add the ability for CardStar to use the camera to read bar code utilizing a form of OCR. Overall I am impressed and will continue to use it. My friends with their Blackberry's jaws dropped when I used CardStar. Now they want it too.

Good app. All the barcode stuff works but there is no support for target which is the only bad thing. Please add target. And I still give five stars!

I absolutely LOVE the idea behind this app. It's a pleasure to get all those little plastic cardlets out of my wallet. Add to that the total (admittedly geeky) "Wow!" factor when I pass the iPhone with the barcode displayed to the clerk.

Didn't work for me today. Cashier had to type it in. He thought it was too reflective? Will increase my star rating if it works at Petco.

It works I couldn't believe it the first time I pulled it out at a store :) perfect way to get rid of all the cards on your keychain.

Make sure if your card number has spaces, you put those spaces in. It makes a difference in the barcode. Compare your card to the one shown on the screen if you're not sure. I love this app, it works perfectly fine for me, and I have no anti-glare screen protector.

I have a handheld scanner and played around with different screen brightness levels. Instead of 60%, it actually worked better when the screen brightness was at the darkest setting.

This app is GREAT!! I used it at Kroger this weekend and it worked perfectly. I'm looking forward to taking all my cards off my keys. I put my library card in and I'm hoping that will work. What about Gym Membership cards? It would be great if those were on there too. I'm a member of our city's athletic center (Frisco, TX). Also, I have a card to "The Children's Place" and they weren't on the list of stores. Overall AWESOME!!

AWESOME idea for an app. I tested the barcodes on two types of scanners digital imaging and standard laserery ones. The barcodes work great. The Casher's at grocery stores are so amazed! I'd have paid 5 bucks for this app, even in it's simplicity.

I loved the idea of being able to get rid of all my cards. But this thing doesn't work at all. I tried all of the supposed tricks, including turning up brightness, holding it perfectly still, etc. I verified the bar code was exactly like that on the card. Still nothing. I've been embarassed too many times saying 'scan this' and having the clerk an others laugh at me and then have to enter my phone number anyway. Do yourself a favor and skip looking foolish. APP FAIL 

This is one of those apps that I keep on my 1st page because I use it so often. It's also one of the top 5 apps that I recommend to my friends that get a new iPhone or iPod. It works 95% of the time and always gets a, "wow, that's neat!" from the cashier.

I have used this at grocery stores, office supply stores, and retail stores and it has never failed me. If you are careful and put in your number correctly and verify the barcode looks like your original you'll be set! No more key fobs, cards in the wallet, etc. One word of warning- don't get rid of your cards! I did a reset on my iPhone without a recent backup and I lost my numbers. That would be my only feature request- add a sync service of some kind.

Great app, I can't believe I never heard of this until recently. It has already come in handy a few times, love it. Something I would like to see added/changed: When using the store locator, instead of quitting the app and launching Maps.app could your team take advantage of the new OS 3.0 features and impliment in-app Maps? That would be awesome. twitter.com/josh_hofer

This is an excellent app. You can get rid of all those cards and dangle cards from your keyschain for any store that has a rewards program. Pull out the phone and the barcode is there to scan and its free. A must have. My wallet is thin now!

I go to Olympus Gym which was not listed. Put in my number and it worked. The plastic key chain card I had from the gym broke off my key chain and frequently fell out of my pocket. Now all I need is my phone in my pocket and my bluetooth headphones. LOVE IT!

I don't know if something changed with the most recent version, but I'm having a higher success rate since updating. I also follow the suggestion to present the barcode in portrait layout and keep the wand a good six inches or more away from the screen. Even when the bar codes don't scan, the cashier can still type the number in from the display. I have been able to switch to smaller wallets and keyrings.

I actually work for CVS and i can use my employee card on my phone to clock in and out of work. I also get my employee discount when I buy stuff of course. It's my new favorite app.

I couldn't get it to work at CVS while I was using a 3G with a screen protector. After switching to a 3GS without a screen protector it has worked every time, at least at CVS. They were using a handheld scanner.