10-28-2008 Version 2.0 Excellent Product  
By: oldwood - Oct 28, 2008
Version: 2.0
This is by far the best replica of the 12C especially once you download the 2.0 update.
Keying in number is perfect dead-on and very quick. Before ver 2.0 it was difficult at best.
They have also made the sound much nicer and added the option to rotate the screen.
My only request would be to have a settings "choice" to lock the screen in landscape
or regular mode or let it rotate as you move it (default setting). Extremely nice app.

Works great, as expected  
By: joefinanceutah - Mar 24, 2009
Version: 2.0.1
This app works great for me. I do financial planning every day in my career, and use the TVM functions of this calculator several times a day. It has never failed me yet. The only problem I've ever had with it is when I use it while I'm on a call and it pushes some of the bottom of the screen out of view. This, I'm sure, is simple to fix.
I assume a lot of the bad reviews have come from people who didn't really know how to run a 12C in the first place. It's a little different from a regular calculator, input-wise. FYI.

Great product, great price!  
By: aardwolf - Nov 19, 2008
Version: 2.0
Don't pay attention to the bad reviews complaining about the icon and logo... It was changed months ago and it tons better. The key response issue was fixed, and this calculator is a great buy if you only need the limited functions (such as NPV). An Algebra function would have been nice, but I'm not really complaining for only $2. Compare this to the $20 version from another developer that has slightly more features.

My initial review was incorrect. The calculator does compute correct #s!  
By: dtgiv - Apr 10, 2009
Version: 2.0.1
Great app. be sure to check the default mode when peforming time value functions. The default is in "end" mode, not "begin" mode. Some calculations will display different outputs in different modes. For example, my real 12C calc was set to "Begin" mode when I originally tried to compare calculations. When I switched the "12C Lite" to Begin mode as well, the outputs were the same as the original calc.
This is a great application and I look forward to more from RLM. All other financial calcs seem to be working great here.

Excellent Financial calulator - just like the HP12c  
By: SPF - 13-Sep-2008
Version: 1.0
All of the functionality of the real thing. Bond calcs and programs. Very clear graphics. This free lite version will lose all stored details when exited. I would happily pay for a 'non-lite' version; even though I have already purchased Claculator 12 (which lacks a lot of functionality and has known bugs..).
Note that if the iPhone switches itself off (standby), then the data is not lost - it is only lost once you switch applications.

Gets the Job Done  
By: WallaStreet - Oct 26, 2008
Version: 1.2
I read the other reviews before spending $2 on this...but I've found this app to work just fine. It does the basic calcs just like my HP12C. I agree that the buttons seem a little unresponsive, and wish it recognized the entry more quickly, but if you just tap the 'center' of each button and don't enter the data too quickly...your fine...the results are accurate. No buyers remorse here. A mobile must for anyone in finance.

Would gladly pay a few dollars for a full version  
By: shrinkie1964 - 22-Sep-2008
Version: 1.0
Lovers of the Voyageur series of HP calculators (such as the 11C, 12C, 15C, and 16C) already know that RLM produces excellent desktop based emulators of all of these calculators. A lifetime subscription to RLM software can be purchased very economically, though it seems unlikely that this such a subscription will apply to AppStore downloads given the special arrangements developers must make with Apple to get their work posted here. The good news is that we know that RLM has source code for calculators other than the 12C, and hopefully we will soon see iPhone versions of the others, particularly the cult-favourite 15C (I paid almost 400 bucks for a near mint one--they are that beloved by collectors!)
As for the 12c Lite, the only "flaw" in it is that it IS a Lite version, and at the moment a fully appointed paid version is not available. The lack of persistent, continuous memory is really a drawback, especially if, like me, you like to write programs. The same concern applies to cashflow problems--if you want to keep data in the CF registers between instances, you are out of luck. That said, the interface is beautiful to behold, and for those used to typing accurately on the iPhone QWERTY keyboard the smallish keypad will not be any hardship. 12c Lite seems to use the iPhone CPU, which means that complex calculations and programs run faster than on the original calculator.
I encourage all lovers of HP calculators to download this fine app and support its further development by purchasing the full version when it comes out. Also, please write Mr. Matte to encourage a release of the other Voyageur emulators. I know I have!
Edit in Reply to BabeBooth: I do admit that the built in landscape mode calculator is very good, offering double precision display and some excellent extended functions. However, comparing the 12c emulator to this is apples and oranges. 12c lite emulates a classic HP programmable financial calculator that uses Reverse Polish Notation as its entry system. This system involves a four line stack to hold intermediate results that is well known and loved by lifelong HP users. The built-in iPhone calculator is a scientific calculator, uses algebraic entry, and is not programmable. They are totally different things, and calculator and calculator simulator aficianados readily see this. I have no problem with your opinion, but in this case you facts are just plain wrong. The calculator buff loses nothing by trying out this free download.

12C lite  
By: Tony_lfb - Jul 27, 2009
Version: 1.0
keys a little sticky, but it's great, and cheaper than the real 12C

Amazed!  
By: College planner - Sep 15, 2008
Version: 1.0
I paid $80 for the real version of this calculator 6 months ago. This app is all I need. Wow and free. A must for any financial planner. Works great. Freeee. They r selling another version for $20. Hurry up and download. This one is better!!!

12C Lite  
By: bbmack - Sep 12, 2008
Version: 1.0
Thank you so much!!! This is what I've been waiting for without the $20 price tag. The Lite version is all I need and was worth the wait. Thanks!!

Awesome app  
By: Sporeman - Sep 15, 2008
Version: 1.0
I have the desktop version of the 12C Platinum and love it. I am more than pleased that I can now to present value equations on my phone and use it like a 12C. This is a dream come true!

Does the job; free.  
By: Jeremy Wa - Sep 23, 2008
Version: 1.0
It does the job and is free. For those habituated to a lifetime of RPN, this is just fine.
It may not be the HP 12C Platinum but most of the time, that is not needed.
To the author/writer: Thank you for this useful and worthwhile app.
Especially thanks for making it free, considering the time and effort you expended to produce it.

Good app for my work  
By: Civilgod - Sep 29, 2008
Version: 1.1
Good app for my work. thx to u!

Very nice!  
By: mapsmith - Sep 25, 2008
Version: 1.1
Works just like the real thing! Price is right!

Great 12c Replication  
By: 12cUser - Sep 25, 2008
Version: 1.1
Very good app for those of us who use the HP 12c every day. Not perfect but very good . . . and free. Key press noise is a little odd but all you have to do is silence your phone - problem solved. Thanks for a really great free app. Many will appreciate it.

Excelent  
By: Bueno99 - Sep 12, 2008
Version: 1.0
Works great and is free!!

Works great.  
By: SDRiding - Sep 25, 2008
Version: 1.1
New update improved screen responsiveness immensely. Can't beat the price.

Love it!  
By: Ben_E - Sep 26, 2008
Version: 1.1
It works great! I love the fact it's free!

Update is great  
By: KoukiFC3S - Sep 24, 2008
Version: 1.1
The new update made the calculator much more responsive!This is now my financial calculator of choice.

Perfect  
By: Nick8888 - Oct 3, 2008
Version: 1.1
I got this app for my managerial finance class in college instead of buying a $40 calculator, and I cannot be happier with it. RPN is a little hard to get used to but easy to use once you get a hang of it. Awesome free app!