12Calc vs RLM
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.
RLM
This finance and business calculator emulates the HP-12C Platinum, offering a comprehensive suite of tools for financial analysis, business calculations, statistics, and scientific functions. It allows for loan amortization, bond pricing, option valuation, currency exchange, and program creation, all within an intuitive iOS interface.
- Finance and business calculations
- Loan amortization and bond pricing
- Black-Scholes options valuation
- Currency exchange with online rates
- Statistical analysis
- Scientific and unit conversions
- Program creation and equation solving
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DESCRIPTION: The RLM-12PX is a programmable financial calculator inspired by the real world HP-12C Platinum or Anniversary calculator. It keeps the classic financial keyboard and its keystroke programming, and adds 30 worksheets designed to bring up the most of your iOS devices for financial, business, mathematical and scientific work. >Keyboard: •RPN and algebraic entry, with a four-level stack and storage registers. •Time value of money, amortization, NPV, IRR, bond price and yield, SL, SOYD and DB depreciation, dates, percentages and statistics directly from the keys. •Keystroke programs with pauses, conditional tests and branches, written in a full-screen editor and saved and loaded by name. >Finance Worksheets: •Account Balance: Calculates the balance of cash transactions and interest applied at arbitrary dates. •Loan Amortization: Amortization schedule for a single payment or several payments at once. •Bonds Price & Yield: Calculates the price, yield and effective duration of a bond. •Black-Scholes Options: Calculates the CALL, PUT and “Greeks” values of a Black-Scholes European option. •Depreciation: Calculates depreciation with SL, SOYD, DB or MACRS methods. •Interest Conversion: Nominal and effective interest conversion. •Time Value of Money: Calculates compound interest problems. >Business Worksheets: •Bill-Tip-Split: Calculates the sharing of a bill with tip. •Break Even: Analyzes the relation Profit = (Price - Var.Cost) • Units - Fix.Cost •Currency Exchange with manual or on-line rates. •Inventory Turn Over. •Percents & Margins: Calculates %Change, %Total and business margins. •Return on Investment. >Cash Flows Worksheets: •Equal Periods: NPV, IRR, MIRR, NFV, payback and discounted payback of cash flows occurring at regular time intervals. •Unequal Periods: Cash flows occurring at arbitrary dates. >Statistics Worksheets: •Probability: 16 probability distributions. •(X,N)-List Statistics: One-variable statistics. •(X,Y)-List Statistics: Two-variable statistics and curve fitting. >Scientific Worksheets: •Angles & Polar-Rectangular conversions. •Combinations & Permutations. •Logarithms, Trigonometric, Hyperbolic and Number Alteration functions. •Quadratic Equation solver. •Triangle Solution: Solves plane and spherical triangles. •Universal Constants: The CODATA physical constants values and descriptions. •Units Conversion: Physical units conversion, completely customizable. >General Worksheets: •Date / Time: Calculates days between dates with Actual, 360 or 365 day calendars, and time intervals between different times. •Solver: Solves arbitrary equations entered as text for any of the variables, knowing the others. •Storage Registers: Store and perform operations directly on the calculator's storage registers. •Memory Content: Clear, back up or restore part or all of the calculator's memory. •General Settings: Customize display format, decimals, date format, angle unit, sounds, haptics and more. •Help Documents: Description and examples of all the calculator worksheets and features. >Editors: To create or edit data •(Date,Trx) List: Transactions and their dates for the "Account Balance" worksheet. •(Date,CF) List: Cash flows and their dates for the "Unequal Periods" worksheet. •(X,N) List: Values and repetitions for cash flows and statistics. •(X,Y) List: X and Y data samples for the statistics worksheets. •Program: Keystroke programs. •Solver Equation: Algebraic expressions for the "Solver" worksheet. •Units Database: Customize the "Units Conversion" worksheet. System requirements: iOS 26.0 or above. 30-day free trial, then a single one-time Lifetime Purchase of $9.99 USD. No subscription. License Agreement: http://www.apple.com/legal/itunes/appstore/dev/stdeula Disclaimer: THIS IS NOT A HEWLETT PACKARD CALCULATOR, AND IS NOT SPONSORED IN ANYWAY BY HEWLETT PACKARD OR ANY OF ITS SUBSIDIARIES.
Screenshots
Verdict
The clearest difference is review sentiment: 12Calc at 96% against RLM's 33%. 12Calc also leads on rating (4.9 vs 4.3) and in-app purchases (none vs 4). RLM's advantage is price (Free vs $8.99) and update cadence (monthly vs every 5 months). On ads and device support 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
RLM is free to download; 12Calc costs $8.99 up front. RLM sells 4 in-app purchases, starting at $0.49 per month. 12Calc asks for nothing beyond the download.
12Calc holds the better App Store score, 4.9 against 4.3. That said, the two scores are not equally well evidenced: 12Calc has 926 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 96% of 12Calc's written reviews are positive against 33% of RLM's.
12Calc ships an update every 5 months, RLM monthly. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.
| Parameter | 12Calc | RLM |
|---|---|---|
| Price | $8.99 | Free — better |
| Rating | 4.9 (926 ratings) — better | 4.3 (4 ratings) |
| Positive reviews | 95.9% of reviews — better | 33.3% of reviews |
| Number of ratings | 926 — better | 4 |
| Update frequency | Every 5 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Best chart rank | #155 — better | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.6 — better | 26.0 |
| Further details — not scored | ||
| Size | 6 MB | 8 MB |
| Age rating | 4+ | +4 |
| Developer | Ernest Brock | R.L.M. Software |
Customer experience
12Calc
RLM
In-app purchases
12Calc
No in-app purchases
RLM
- Monthly Subscription$0.491 Month
- Semi-Annual Subscription$2.996 Months
- Annual Subscription$5.991 Year
- Lifetime Purchase$9.99






