12Calc vs FairOption
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
12Calc
This app provides a full-featured financial calculator experience, replicating the functionality of a popular physical model. It offers an audit tape for tracking calculations, a unit converter with currency exchange rates, and various worksheets with interactive graphs for financial analysis. Optimized for modern devices with high-resolution graphics and support for multiple orientations.
- HP12C emulation
- Audit tape for calculation history
- Unit and currency converter
- Interactive financial worksheets
- Portrait and landscape views
- Contextual help and tutorials
- HD graphics with color themes
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12Calc is a full version of the well known HP12C for the iPhone and iPad. It also includes an audit tape, unit converter, worksheets, rotated views, user guide and HD graphics optimized for iPad and iPhone retina displays. •Runs in 64 bit mode on the latest iOS release and new iPads and iPhones. •Calculations are highly accurate and blazing fast. No more "running" flashing displays for amortizations, depreciation schedules or interest calculations. Work as fast as you can type. •Audit Tape: The audit tape keeps a record of your calculations. You can review, mail, text, share or print the tape. •Unit Converter: Convert between a wide variety of common units and currencies. Currency rates can be downloaded from the internet. •Work Sheets with interactive graphs: Auto Purchase Black-Scholes Bond Break-even Cash Flow analysis Currency Date Depreciation Interest Conversion Lease Loan Amortization (includes option for Canadian mortgages) Margin&Markup Refinance Statistics Tip TVM •Views for all orientations: Portrait and landscape renderings of the full keyboard are provided for iPhone and iPad. The iPad version includes slide over and multiple split view displays as well as side-by-side display of the help page, audit tape, tvm mortgage table or program variables. •Built-in contextual help: Touch the ? key for a description of any keyboard function with examples of use. If you are just learning or can't remember how to use a function- just touch the ? key. Includes tutorials on how to use reverse Polish notation (RPN) and how to solve time value of money problems. •HD Graphics: Graphics optimized for both retina and standard resolution screens. Choose from multiple color schemes including gold, rose gold, brass, copper, silver and several color tints.
FairOption
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WELCOME to the FairOption App *** THE GOLD STANDARD OPTION PRICING CALCULATOR (Since 2014) *** Version 3.2 is a super-powerful, easy-to-use option pricing tool completely rewritten using Apple's latest SwiftUI framework, and now available for numerous Apple devices including iPhone, Mac, iPad and Apple Watch. All versions include syncing of your securities data across all Apple platforms you purchase the App. See screenshots here for the main features, and website video for more detail. If you are someone who wants the best option pricing software on the top and most secure Apple platform, then you can do no better than use the FairOption App. FEATURES and BENEFITS: - Fast Option Pricing in a fully interactive, two-way scrollable grid. - Works great in Light and Dark Modes (Plus in Landscape and Portrait orientations on iPhone and iPad). - Greeks are displayed (with descriptions) by a single tap on any option result. - Auto Syncing of securities between your Apple devices. (The App is supplied per-platform) - Comprehensive Help document covering all app features and settings. - Binomial and Black-Scholes pricing models are included. (The Binomial has an adjustable number of calculation steps and is more suited to American exercise-style options. The Black-Scholes-Merton model is better for pricing European options and is adapted for dividend-paying securities) - Included Continuously Compounded Interest Rate calculator for input of the risk-free interest rate parameter. (Extensive explanation contained within help document) - Automatic strike price intervals that can be easily overridden with 1 tap. - Editable default template for all new securities. - Numerous utilities, including for import/export of securities data to a local file (in JSON or CSV format) for spreadsheet analysis, or backup/restore purposes. - Added Demo data utility: to help you get 'up-to-speed' using the 'Quick Start Guide'. - Test Calc mode to set a fixed amount of time to expiry for test and comparison purposes. - No 'in-app' purchases. (It's already 'All-in-there'!) - Designed by main Developer with over 30 years' experience of developing financial and option pricing software. *** Whether you are a Pro Trader, or someone just starting out learning about options, you will find FairOption to be an invaluable tool *** WHAT'S NEW in VERSION 3.2: - Ability to sync across all Apple device platforms you purchase the app - Complete rewrite using SwiftUI (The framework first introduced by Apple in 2019) - Import/Export of Securities data (This facilitates independent local backup and restore via the JSON file format) - Included Demo Data utility for testing and familiarity purposes. - All Option results tables are scrollable in both directions on all devices and fully interactive - Short-term Weeklys and longer-term LEAPS option expiry variants are specifically catered for - Improved, faster switching between Call and Put option results, but whilst still maintaining the current expiry and strike price selection - Included Continuously Compounded Interest Rate Calculator for easy calculation of the risk-free interest rate parameter - Editable default template for all new securities SUPPORT We welcome feedback and suggestions concerning FairOption. Please contact us at support@FairOption.com if you have any problems Our Terms of use: https://www.fairoption.com/terms.php Our Privacy Policy: https://www.fairoption.com/privacy.php Apple's Licence Agreement: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is price: 12Calc at $8.99 against FairOption's $17.99. 12Calc also leads on update cadence (every 5 months vs every 23 months) and chart position (#187 vs unranked). On ads, in-app purchases, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
12Calc costs $8.99 and FairOption $17.99 up front. Neither carries in-app purchases, so what you see is what you pay.
12Calc ships an update every 5 months, FairOption every 23 months. The most recent releases landed on September 25, 2026 and May 15, 2026 respectively.
| Parameter | 12Calc | FairOption |
|---|---|---|
| Price | $8.99 — better | $17.99 |
| Rating | 4.9 (916 ratings) — better | — |
| Positive reviews | 95.9% of reviews | — |
| Number of ratings | 916 — better | — |
| Update frequency | Every 5 months — better | Every 23 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Best chart rank | #187 — better | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 16 — better |
| Further details — not scored | ||
| Size | 6 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Ernest Brock | Miles Hitcham |
In-app purchases
12Calc
No in-app purchases
FairOption
No in-app purchases









