Comparison

Gear Calculator Plus vs CalcEngineer

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

Head to head
About

Gear Calculator Plus

Calculate a car's theoretical speed in any gear based on engine RPM, transmission, differential ratios, and tire size. It can also determine travel distance per engine revolution and estimate top speed for each gear. Supports both metric and imperial units.

Highlights
  • Calculate theoretical speed per gear
  • Calculate travel distance per engine revolution
  • Determine top speed for each gear
  • Metric or Imperial units
  • Universal app for iPhone and iPad
Features
Read full description

Gear Ratio Speed Calculator. With the gear ratios of the transmission and differential, and the size of the tires, it becomes possible to calculate the speed of the car for a particular gear at a particular engine RPM. Features: Calculate theoretical speed for a car for each of its gear ratios. Calculate travel distance for each engine revolution. Use maximum RPM to figure top speed for each gear. Metric or Imperial units for selection. Universal app for both iPhone and iPad. Axle ratio are similar as Final Drive Ratio. If a car has less than 6 gears, only enter the ratios that apply. Note that you will get unreal speeds for overdrive gears. This is because in reality top speed is physically limited by it power or by aerodynamic drag. Thanks for your support and do visit nitrio.com for more apps for your iOS devices.

About

CalcEngineer

This app provides professional engineering calculations for compressed air systems. It helps engineers and technicians determine CFM requirements, size compressors and tanks, and analyze pressure drops for optimized pneumatic systems.

Highlights
  • CFM Calculator
  • Compressor & Tank Sizing
  • Pressure Drop Analysis
  • Flow Velocity & Pipe Sizing
  • Multiple CFM Entries
  • General Engineering Calculator Suite
Features
Read full description

CalcEngineer - Professional Engineering Calculators The ultimate compressed air system calculator for engineers, technicians, and professionals. Calculate CFM requirements, size compressors and tanks, analyze pressure drops, and optimize your pneumatic systems with engineering-grade precision. KEY FEATURES: • CFM Calculator - Air actuator airflow calculations with real-time results • Compressor Sizing - Size compressors for your specific air demands • Tank Sizing - Calculate air receiver tank requirements and capacity • Pressure Drop Analysis - Determine pressure loss in pipes and fittings • Flow Velocity Calculator - Calculate fluid velocity for optimal system design • Pipe Sizing - Optimize pipe diameter selection for efficiency • Multiple CFM Entries - Add multiple air demands for complex systems • Engineering Calculator Suite - Additional tools for mechanical, electrical, chemical, and thermal engineering PROFESSIONAL TOOLS: • Real-time calculations using industry-standard formulas • Pre-filled values that transfer between calculators • Imperial and metric unit support with automatic conversion • Engineering-grade accuracy for professional applications • Clean, intuitive interface designed for daily use PERFECT FOR: • Industrial engineers and maintenance teams • System designers and consultants • Engineering students and educators • Manufacturing and facility managers • HVAC professionals and technicians Built by Justin Bush | JB CRE8IV - Professional engineering calculation solutions.

Screenshots

Gear Calculator Plus4 screens
CalcEngineer4 screens

Verdict

The call

The clearest difference is review sentiment: CalcEngineer at 100% against Gear Calculator Plus's 0%. CalcEngineer also leads on price (Free vs $2.99) and rating (5.0 vs 3.6). Gear Calculator Plus's advantage is iOS requirement (13 vs 17). On ratings volume, 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

CalcEngineer is free to download; Gear Calculator Plus costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

CalcEngineer holds the better App Store score, 5.0 against 3.6. Both are backed by a comparable volume of ratings — 5 and 2 respectively. Written reviews point the same way: 0% of Gear Calculator Plus's written reviews are positive against 100% of CalcEngineer's.

UpkeepUpdate frequency

Gear Calculator Plus ships an update every 29 months, CalcEngineer every 2 days. The most recent releases landed on October 6, 2026 and October 15, 2026 respectively.

Scorecard6 real differences · 4 level
Gear Calculator Plus versus CalcEngineer: the parameters behind the verdict, then further details
ParameterGear Calculator PlusCalcEngineer
Price$2.99Free — better
Rating3.6 (5 ratings)5.0 (2 ratings) — better
Positive reviews0.0% of reviews100.0% of reviews — better
Number of ratings5 — better2
Update frequencyEvery 29 monthsEvery 2 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13 — better17
Further details — not scored
Size1 MB10 MB
Age rating4+9+
DeveloperNitrioJustin Bush

Customer experience

Gear Calculator Plus

All ratings5 ratings
Positive60.0%
Neutral20.0%
Negative20.0%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

CalcEngineer

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Gear Calculator Plus

No in-app purchases

None

CalcEngineer

No in-app purchases

Questions

Is Gear Calculator Plus free?
Gear Calculator Plus costs $2.99, with no in-app purchases.
Is CalcEngineer free?
CalcEngineer is free to download, with no in-app purchases.
Which has better reviews, Gear Calculator Plus or CalcEngineer?
CalcEngineer is rated higher. Gear Calculator Plus averages 3.6 out of 5 from 5 ratings, while CalcEngineer averages 5.0 from 2 ratings.
Do Gear Calculator Plus or CalcEngineer have ads?
Neither Gear Calculator Plus nor CalcEngineer shows ads.
Which is updated more often, Gear Calculator Plus or CalcEngineer?
Gear Calculator Plus ships an update every 29 months, and CalcEngineer every 2 days. Most recently, Gear Calculator Plus was updated on October 6, 2026 and CalcEngineer on October 15, 2026.

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