Comparison

Complex RPN Calculator vs Projectile Motion Calc

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

Head to head
About

Complex RPN Calculator

This scientific calculator utilizes a four-level stack and natively handles complex numbers. It allows users to input and view numbers in both polar and rectangular formats, remembering its state and offering 10 memory locations.

Highlights
  • Complex number support
  • Four-level stack
  • Polar and rectangular formats
  • State persistence
  • 10 memory locations
  • Scientific calculations
Features
Read full description

Complex RPN Calculator is a scientific RPN calculator with a four stack whose native number is complex. You can view and enter numbers in both polar and rectangular formats. Complex RPN remembers its state between usages and has 10 memory locations.

About

Projectile Motion Calc

This physics calculator quickly determines key projectile motion parameters like horizontal and vertical velocity, time of flight, range, and maximum height. It supports various units and offers precise calculations up to 16 decimal places.

Highlights
  • Instant calculation of projectile motion parameters
  • Copyable results to other apps
  • Includes reference formulas
  • Supports up to 16 decimal places
  • Supports various input units
  • Lightweight and optimized for everyday use
Features
Read full description

Projectile Motion Calculator is a physics/math calculator designed to find Horizontal velocity, Vertical velocity, Time of flight, Range of the projectile, or Maximum height quickly and easily. Features: - Instant calculation - Results are copyable to other apps - Formulas are included as references - Supports up to 16 decimal places - Supports various units for each input - Lightweight app with a small size, optimized for everyday use Projectile motion is a form of motion experienced by an object or particle (a projectile) that is thrown near the Earth's surface and moves along a curved path under the action of gravity only (in particular, the effects of air resistance are assumed to be negligible). This curved path was shown by Galileo to be a parabola. The study of such motions is called ballistics, and such a trajectory is a ballistic trajectory. The only force of significance that acts on the object is gravity, which acts downward, thus imparting to the object a downward acceleration. Because of the object's inertia, no external horizontal force is needed to maintain the horizontal velocity component of the object. Taking other forces into account, such as friction from aerodynamic drag or internal propulsion such as in a rocket, requires additional analysis. A ballistic missile is a missile only guided during the relatively brief initial powered phase of flight, and whose subsequent course is governed by the laws of classical mechanics. Projectile motion equations: - Horizontal velocity component: vx = v * cos(θ) - Vertical velocity component: vy = v * sin(θ) - Time of flight: t = 2 * vy / g - Range of the projectile: R = 2* vx * vy / g - Maximum height: ymax = vy^2 / (2 * g) Thanks for your support and do visit nitrio.com for more apps for your iOS devices.

Screenshots

Complex RPN Calculator4 screens
Projectile Motion Calc4 screens

Verdict

The call

The clearest difference is review sentiment: Complex RPN Calculator at 52% against Projectile Motion Calc's 0%. Complex RPN Calculator also leads on price (Free vs $2.99) and update cadence (every 5 months vs every 29 months). Projectile Motion Calc's advantage is iOS requirement (13 vs 16.4). On ads, in-app purchases 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

Complex RPN Calculator is free to download; Projectile Motion Calc costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Complex RPN Calculator holds the better App Store score, 3.9 against 3.7. That said, the two scores are not equally well evidenced: Complex RPN Calculator has 24 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 52% of Complex RPN Calculator's written reviews are positive against 0% of Projectile Motion Calc's.

UpkeepUpdate frequency

Complex RPN Calculator ships an update every 5 months, Projectile Motion Calc every 29 months. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

Scorecard7 real differences · 3 level
Complex RPN Calculator versus Projectile Motion Calc: the parameters behind the verdict, then further details
ParameterComplex RPN CalculatorProjectile Motion Calc
PriceFree — better$2.99
Rating3.9 (24 ratings) — better3.7 (3 ratings)
Positive reviews51.7% of reviews — better0.0% of reviews
Number of ratings24 — better3
Update frequencyEvery 5 months — betterEvery 29 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.413 — better
Further details — not scored
Size1 MB1 MB
Age rating4+4+
DeveloperJohn CoddingtonNitrio

Customer experience

Complex RPN Calculator

All ratings22 ratings
Positive72.7%
Neutral0.0%
Negative27.3%
Written reviews87 reviews
Positive51.7%
Neutral8.0%
Negative40.2%

Projectile Motion Calc

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews2 reviews
Positive0.0%
Neutral50.0%
Negative50.0%

Bugs and requests

Complex RPN Calculator

Reported bugs

6 issues
  • Mutes other apps when used
  • Slow keyboard response after update
  • X^3 calculation incorrect for large imaginary numbers
  • App crashes on opening/button press (historical iOS 9 issues)
  • App starts upside down in landscape on iPad (historical iOS 8 issue)
Show 1 more
  • Unreadable fonts on iPad (historical version 1.2 issue)

Requested features

24 requests
  • Turn off key click sound
  • Customize number display
  • See the stack
  • Fix slow entry response
  • Fix imaginary number calculation (X^3)
Show 19 more
  • Improve SwiftUI design (less whitespace)
  • Show all stack levels
  • Add angle function
  • Add magnitude function
  • Add 'Clear X' button
  • Make RAD/DEG toggle button
  • Single button for Sci/Eng/Fix/Raw modes
  • Add '//' (parallel) function
  • Add 'Module' button
  • Change 'i' to 'j' for imaginary part
  • Show stack levels
  • Add log2 function
  • Add logGamma function
  • Smaller buttons
  • Add complex conjugate button
  • Add real part button
  • Add imaginary part button
  • Add modulo function
  • Make app start faster

Projectile Motion Calc

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Complex RPN Calculator

No in-app purchases

None

Projectile Motion Calc

No in-app purchases

Questions

Is Complex RPN Calculator free?
Complex RPN Calculator is free to download, with no in-app purchases.
Is Projectile Motion Calc free?
Projectile Motion Calc costs $2.99, with no in-app purchases.
Which has better reviews, Complex RPN Calculator or Projectile Motion Calc?
Complex RPN Calculator is rated higher. Complex RPN Calculator averages 3.9 out of 5 from 24 ratings, while Projectile Motion Calc averages 3.7 from 3 ratings.
Do Complex RPN Calculator or Projectile Motion Calc have ads?
Neither Complex RPN Calculator nor Projectile Motion Calc shows ads.
Which is updated more often, Complex RPN Calculator or Projectile Motion Calc?
Complex RPN Calculator ships an update every 5 months, and Projectile Motion Calc every 29 months. Most recently, Complex RPN Calculator was updated on October 21, 2026 and Projectile Motion Calc on October 24, 2026.

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