Comparison

Binary Calc vs Scientific Calculator Plus 991

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

Head to head
About

Binary Calc

Perform arithmetic operations and convert numbers between bases 2 and 36. Supports signed/unsigned bit negative numbers with two's complement and fractions up to 8 decimal places.

Highlights
  • Arithmetic operations (base 2-36)
  • Number base conversion
  • Input in different bases
  • Two's complement for negative numbers
  • Fraction support (up to 8 decimal places)
Features
Read full description

A calculator that supports arithmetic operations for numbers from base 2 to 36. Has functionality for converting numbers between different bases, and input of numbers in different bases. Supports signed/unsigned bit negative numbers using two's complement, and fractions in bases up to 8 decimal places.

About

Scientific Calculator Plus 991

This app is a powerful scientific calculator with graphing capabilities, a formula library, and a unit converter. It offers natural display input, advanced math functions for algebra, calculus, and statistics, and supports various number bases and formats.

Highlights
  • Natural display input
  • Graphing module
  • Formula library
  • Unit and currency converter
  • Algebra and calculus tools
  • Matrix and vector operations
  • Statistical calculations
Features
Read full description

NCalc — Powerful Scientific Calculator, Graphing, and Converter NCalc combines a natural-display scientific calculator, advanced math tools, a full graphing module (as 83/84 calculator), a large formula library, and a comprehensive unit and currency converter—designed for students, engineers, and anyone who loves math. ◉ Main Calculator Features - Natural display: Enter expressions exactly as in textbooks—fractions, roots, exponents, and more—see results as written on paper. - Keyboard layout: Matches popular models for familiarity and speed: 115 ES Plus, 991 ES Plus, 300 ES Plus, and 991 EX. - Symbolic and numeric modes: Perform exact fraction calculation or evaluate numerically when needed. - Arbitrary precision integers: Work with very large integers without losing accuracy. - Output types: Choose from fraction, mixed fraction, decimal, repeating decimal, degrees/minutes/seconds, and polar coordinates. - Angle units: Degree, radian, and gradian (grade). - Decimal formatter: Display numbers in normal, engineering, engineering SI, scientific, or fixed formats. - Calculation history: Review and reuse past calculations with ease. - Copy and paste support for fast data entry and sharing. ◉ Algebra, Calculus, and Core Math - Algebra calculation: Expansion, factorization, simplification, and more. - Calculus calculator: Derivatives, integrals, and limits of expressions. - Complex number calculation: Arithmetic, polar/rectangular conversion, exponential, logarithm, powers, roots, and full trigonometric functions. ◉ Equations and Inequalities - Equation solver: Solve general equations, plus dedicated solvers for quadratic, cubic, and quartic equations. - System of equations solver: Solve systems with 2, 3, or 4 variables. - Inequality solvers: Quadratic, cubic, and quartic inequalities with interval-based solutions. ◉ Matrices and Vectors - Operations: Addition, subtraction, multiplication for matrices and vectors. - Advanced tools: Determinant, inverse, transpose, rank, eigenvalues, and eigenvectors. ◉ Statistics and Distributions - Statistical calculation: Descriptive stats and regression calculation (including a regression plotter). - Distribution calculation: Normal distribution, binomial distribution, Poisson distribution, t-distribution, chi-square distribution, and F-distribution. ◉ Number Bases and Formats - Base N calculation: Effortlessly switch between binary, octal, decimal, and hexadecimal, with arithmetic in each base. ◉ Tables, Variables, and Custom Functions - Table Generator: Generate value tables based on any expression and range. - Calculator variables: Store values and reuse them across calculations. - User-defined functions: Create your own functions to streamline repetitive work. - Built-in constants: A rich set of mathematical and physical constants. ◉ Formulas - Extensive formula collection: Math and Physics formulas, clearly categorized—ideal for secondary school, high school, and university students. ◉ Unit Converter - Currency Converter - 1000+ unit conversions ◉ Graphing as 83, 84 calculator - Cartesian functions, implicit plots, polar, and parametric. - Tracing, roots, intersections, extrema, derivative, and integral evaluations on graphs. ◉ Auto-renewing subscription You may purchase an auto-renewing subscription through an In-App Purchase. • Auto-renewable subscription • Your subscription will be charged to your AppStore account at confirmation of purchase and will automatically renew (at the duration selected) unless auto-renew is turned off at least 24 hours before the end of the current period. • Current subscription may not be cancelled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your AppStore Account Settings after purchase • Privacy policy and terms of use: https://ncalc-app.web.app/terms-of-services.html

Screenshots

Binary Calc2 screens
Scientific Calculator Plus 9914 screens

Verdict

The call

The clearest difference is in-app purchases: Binary Calc at none against Scientific Calculator Plus 991's 4. Binary Calc also leads on ads (none vs shown) and iOS requirement (13.0 vs 15). Scientific Calculator Plus 991's advantage is ratings volume (13K vs 6) and update cadence (every 2 weeks vs every 2 months). On price, rating 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Scientific Calculator Plus 991 sells 4 in-app purchases, starting at $1.99 per month. Binary Calc asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Binary Calc against 4.7 for Scientific Calculator Plus 991. That said, the two scores are not equally well evidenced: Scientific Calculator Plus 991 has 13K ratings behind it against 6, so its average is the more settled of the two. Written reviews are what separate them: 82% of Binary Calc's written reviews are positive against 92% of Scientific Calculator Plus 991's.

UpkeepUpdate frequency

Binary Calc ships an update every 2 months, Scientific Calculator Plus 991 every 2 weeks. The most recent releases landed on October 16, 2026 and October 17, 2026 respectively.

Scorecard7 real differences · 3 level
Binary Calc versus Scientific Calculator Plus 991: the parameters behind the verdict, then further details
ParameterBinary CalcScientific Calculator Plus 991
PriceFreeFree
Rating4.7 (6 ratings)4.7 (13K ratings)
Positive reviews82.4% of reviews91.7% of reviews — better
Number of ratings613K — better
Update frequencyEvery 2 monthsEvery 2 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS13.0 — better15
Further details — not scored
Size1 MB208 MB
Age rating4+12+
DeveloperBuddy SunTran Duy

Customer experience

Binary Calc

All ratings6 ratings
Positive83.3%
Neutral16.7%
Negative0.0%
Written reviews34 reviews
Positive82.4%
Neutral11.8%
Negative5.9%

Scientific Calculator Plus 991

All ratings12,502 ratings
Positive92.0%
Neutral2.6%
Negative5.4%
Written reviews506 reviews
Positive91.7%
Neutral3.2%
Negative5.1%

Bugs and requests

Binary Calc

Not enough reviews yet to summarise bugs or requests.

Scientific Calculator Plus 991

Reported bugs

3 issues
  • Keyboard input stops working after switching screens
  • Incorrect calculation results for certain operations
  • App crashes on some devices after recent update

Requested features

5 requests
  • Add option to change display font and color
  • Improve cursor control and editing capabilities
  • Implement auto-simplification for complex expressions
  • Add more handwriting font options
  • Expand graphing and equation solving features

In-app purchases

None

Binary Calc

No in-app purchases

4 purchases

Scientific Calculator Plus 991

Subscriptions2
  • Calculator month subscription$1.991 Month
  • Calculator yearly subscription$3.991 Year
One-time2
  • Calculator Premium$5.99
  • Calculator Pro$5.99

Questions

Is Binary Calc free?
Binary Calc is free to download, with no in-app purchases.
Is Scientific Calculator Plus 991 free?
Scientific Calculator Plus 991 is free to download, with in-app purchases available.
Which has better reviews, Binary Calc or Scientific Calculator Plus 991?
Binary Calc and Scientific Calculator Plus 991 are both rated 4.7 out of 5 on the App Store, from 6 and 13K ratings respectively.
Do Binary Calc or Scientific Calculator Plus 991 have ads?
Scientific Calculator Plus 991 shows ads; Binary Calc does not.
Which is updated more often, Binary Calc or Scientific Calculator Plus 991?
Binary Calc ships an update every 2 months, and Scientific Calculator Plus 991 every 2 weeks. Most recently, Binary Calc was updated on October 16, 2026 and Scientific Calculator Plus 991 on October 17, 2026.

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