Comparison

RLM vs SandyCal

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

RLM

This app offers a comprehensive suite of calculators for finance, business, science, and general use. It includes specialized worksheets for loans, investments, statistics, and complex mathematical functions, designed to leverage iOS device capabilities.

Highlights
  • Finance worksheets (amortization, bond pricing, options)
  • Business calculations (bill split, break-even, currency)
  • Statistical analysis (probability, regressions)
  • Scientific functions (complex numbers, vectors)
  • Unit and currency conversions
  • Equation solver
  • Date and time calculations
Features
Read full description

The RLM-17BX is a general purpose calculator with a special focus in finance, business and science. It is designed to bring up the most of your iOS devices with an extensive set of worksheets and enhancements to cover most of the functions generally needed by financial, business, mathematical, engineering and scientific professionals. >Finance Worksheets: •Account Balance: Calculates the Balance of cash transactions and interest applied at arbitrary dates. •Amortization: Loan Amortization Schedule for a single or several loan payments. •Bond 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 and conventions. •Time Value of Money: Calculates compound Interest problems. >Business Worksheets: •Bill-Tip-Split: Calculates the sharing of a Bill with Tip. •Break-Even: Analyze the following relation: Profit = (Price - Var.Cost) • Units - Fix.Cost •Currency Exchange with manual or on-line rates. •Percents & Margins: Calculates %Change, %Total and Business margins. >Cash Flows Worksheets: •Equal Periods: Calculations with Cash Flows occurring at regular time intervals. •Unequal Periods: Calculations with Cash Flows occurring at arbitrary dates. >Statistics Worksheets: •Probability: Combinations, permutations and Normal, Exponential, t-Student and Weibull probability distributions. •One-Variable Statistics: Calculations for one variable data samples. •Two-Variable Statistics: Calculations for two variables data samples. •Curve Fitting: Regression models to fit a curve based on two variables data samples. >Scientific Worksheets: •Complex Numbers: Operations and functions with complex numbers. •Logarithms, Trigonometric, Hyperbolic and Number Alteration functions. •Triangle Solution: Solves a Plane & Spherical triangles. •3D Vectors: Operations and functions with vectors in Cartesian, Spherical or Cylindrical coordinates. •Universal Constants: All the NIST-CODATA physical constants values and descriptions. •Units Conversion: Physical units conversion completely customizable. >Conversion Worksheets: •Angles: Convert angle between DEG,RAD,GRAD,DMS and Slope %. •Currencies: world currencies conversions with manual input or on-line current rates. •Interest Rates: Nominal and effective interest conversion. •Polar-Rectangular: Coordinates conversion. •Units: Physical units conversions. >General Worksheets: •Date: Calculates days between dates with Actual, 360 or 365 days calendars. •Time: Calculates time intervals between different times. •Solver: Calculates arbitrary equations entered as text expression to solve any of the variables knowing the others. •Storage Registers: Store and perform operations directly over the calculators storage registers. •Memory Content: Clear, Back-Up or Restore part or all of the Calculator's memory. •General Settings: Customize many aspects of the calculator including formats & feedbacks. •Help Documents: Description and examples of all the calculator worksheets and features. >Editors Worksheets: To create or edit data •(Date,Trx) List: Transactions and the dates they occurs for the "Account Balance Worksheet". •(Date.CF) List: Cash flows and the dates they occurs for the "Unequal Periods Cash Flows Worksheet". •(X,N) List: Cash flows and repetitions for the "Equal Periods Cash Flows Worksheet". •(X,Y) List: X and Y data samples for the Statistics worksheets. •Solver Equation: Algebraic expression for use in the "Solver" worksheet. •Units Database: Customize the "Units" worksheet. System requirements: iOS 15.0 or above. 30 days Free-Trial. In-App-Purchase: One-Payment for life. 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.

About

SandyCal

Features
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Key Features -High-Precision Support: Handles up to 13 digits for accurate calculations. -Real-Time Expression Display: See your calculation formula as you type. -Clear Digit Grouping: Commas make large numbers easy to read at a glance. -Minimalist & Intuitive: A zero-friction interface for seamless operation. Core Functions -Memory Functions: Full support for M+ / M- / MR / MC. -History Management: Save and reuse your previous calculation results. -Design Themes: Switch between Dark, Pink, and Mercury to suit your style. -Basic Operations: Includes ±, %, ⌫ (Backspace), and AC. Perfect For: -Accurate Calculations: Those who need precision in their results. -Large Numbers: Professionals who handle high-value figures. -Visual Clarity: Users looking for a legible and clean layout. -Simplicity: Anyone who values straightforward, no-nonsense tools. -Experience stress-free computation with Sandy Cal. Privacy Policy Information Collection This application does not collect any personally identifiable information. Data Storage The following data is stored: -Calculation history -Theme preferences -Language settings All data remains exclusively on your device and is never transmitted to any external servers.

Screenshots

RLM4 screens
SandyCal4 screens

Verdict

The call

The clearest difference is in-app purchases: SandyCal at none against RLM's 4. SandyCal also leads on update cadence (every 2 days vs monthly). RLM's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 26.2). On price and ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. RLM sells 4 in-app purchases, starting at $0.49 per month. SandyCal asks for nothing beyond the download.

UpkeepUpdate frequency

RLM ships an update monthly, SandyCal every 2 days. The most recent releases landed on October 15, 2026 and October 17, 2026 respectively.

Scorecard4 real differences · 6 level
RLM versus SandyCal: the parameters behind the verdict, then further details
ParameterRLMSandyCal
PriceFreeFree
Rating3.9 (10 ratings) — better—
Positive reviews53.3% of reviews—
Number of ratings10 — better—
Update frequencyMonthlyEvery 2 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.0 — better26.2
Further details — not scored
Size6 MB1 MB
Age rating4+4+
DeveloperR.L.M. SoftwareHiroyuki Akaji

In-app purchases

4 purchases

RLM

Subscriptions3
  • Monthly Virtual Battery$0.491 Month
  • Semi-Annual Subscription$2.996 Months
  • Annual Subscription$5.991 Year
One-time1
  • Lifetime Purchase$9.99
None

SandyCal

No in-app purchases

Questions

Is RLM free?
RLM is free to download, with in-app purchases available.
Is SandyCal free?
SandyCal is free to download, with no in-app purchases.
Do RLM or SandyCal have ads?
Neither RLM nor SandyCal shows ads.
Which is updated more often, RLM or SandyCal?
RLM ships an update monthly, and SandyCal every 2 days. Most recently, RLM was updated on October 15, 2026 and SandyCal on October 17, 2026.

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