Comparison

APSpace 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

APSpace

This app offers students and staff convenient access to essential university information and services. It acts as a central hub for various applications and resources, streamlining access to campus functionalities.

Highlights
  • Access university information
  • Access university services
  • Centralized app hub
  • Convenient mobile access
Features
Read full description

The Asia Pacific University App provides convenient access to important information and to most of our services in your hand. This application is made to help students and staff to access different applications and services. Your feedback is highly appreciated. Please add a review here in App Store and/or send us an email: cti@apiit.edu.my

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

APSpace4 screens
Scientific Calculator Plus 9914 screens

Verdict

The call

The clearest difference is rating: Scientific Calculator Plus 991 at 4.7 against APSpace's 3.1. Scientific Calculator Plus 991 also leads on review sentiment (92% vs 53%) and ratings volume (13K vs 7). APSpace's advantage is in-app purchases (none vs 4) and ads (none vs shown). On price, update cadence 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. APSpace asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Scientific Calculator Plus 991 holds the better App Store score, 4.7 against 3.1. That said, the two scores are not equally well evidenced: Scientific Calculator Plus 991 has 13K ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 53% of APSpace's written reviews are positive against 92% of Scientific Calculator Plus 991's.

UpkeepUpdate frequency

APSpace ships an update every 4 weeks, Scientific Calculator Plus 991 fortnightly. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.

Scorecard7 real differences · 3 level
APSpace versus Scientific Calculator Plus 991: the parameters behind the verdict, then further details
ParameterAPSpaceScientific Calculator Plus 991
PriceFreeFree
Rating3.1 (7 ratings)4.7 (13K ratings) — better
Positive reviews52.6% of reviews91.7% of reviews — better
Number of ratings713K — better
Update frequencyEvery 4 weeksFortnightly — 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
Size83 MB169 MB
Age rating4+12+
DeveloperAPIIT Sdn Bhd.Tran Duy

Customer experience

APSpace

All ratings7 ratings
Positive42.9%
Neutral28.6%
Negative28.6%
Written reviews19 reviews
Positive52.6%
Neutral10.5%
Negative36.8%

Scientific Calculator Plus 991

All ratings12,520 ratings
Positive92.0%
Neutral2.6%
Negative5.4%
Written reviews509 reviews
Positive91.7%
Neutral3.1%
Negative5.1%

Bugs and requests

APSpace

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

APSpace

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 APSpace free?
APSpace 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, APSpace or Scientific Calculator Plus 991?
Scientific Calculator Plus 991 is rated higher. APSpace averages 3.1 out of 5 from 7 ratings, while Scientific Calculator Plus 991 averages 4.7 from 13K ratings.
Do APSpace or Scientific Calculator Plus 991 have ads?
Scientific Calculator Plus 991 shows ads; APSpace does not.
Which is updated more often, APSpace or Scientific Calculator Plus 991?
APSpace ships an update every 4 weeks, and Scientific Calculator Plus 991 fortnightly. Most recently, APSpace was updated on November 2, 2026 and Scientific Calculator Plus 991 on November 5, 2026.

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