Comparison

CalcEngineer vs Psychro Calc Pro

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

Head to head
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.

About

Psychro Calc Pro

Features
Read full description

Psychro Calc Pro is a psychrometric calculator for HVAC engineers and technicians. Calculate dry bulb, wet bulb, dew point, relative humidity, humidity ratio, enthalpy and air density from any two independent properties, at altitudes from −500 m to 11 000 m. CALCULATION ENGINE Saturation pressure over water and ice from the Hyland–Wexler equations (ASHRAE Handbook—Fundamentals, Ch. 1), Greenspan (1976) enhancement factor, and the ASHRAE wet bulb equation. Valid from −100 °C to +200 °C. PSYCHROMETRIC CHART IN PDF REPORTS Relative humidity, enthalpy, wet bulb and specific volume lines, with automatic Standard, Low Temp and Industrial Drying modes. REPORTS & HISTORY SI and IP (Imperial) units throughout — results, chart, PDF reports and history — plus your company logo on PDF reports. FREE TRIAL, ONE-TIME PURCHASE Free to download. Try every feature free for 3 days — no payment, no sign-up. After the trial, unlock everything with a one-time purchase. No subscription, no recurring fees. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://iklimet-lab.com/privacy-policy/

Screenshots

CalcEngineer4 screens
Psychro Calc Pro4 screens

Verdict

The call

The clearest difference is in-app purchases: CalcEngineer at none against Psychro Calc Pro's 2. CalcEngineer also leads on update cadence (every 2 days vs every 4 days). Psychro Calc Pro's advantage is iOS requirement (15.0 vs 17). On price, ads 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. Psychro Calc Pro sells 2 in-app purchases, starting at $3.99 per month. CalcEngineer asks for nothing beyond the download.

UpkeepUpdate frequency

CalcEngineer ships an update every 2 days, Psychro Calc Pro every 4 days. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

Scorecard3 real differences · 7 level
CalcEngineer versus Psychro Calc Pro: the parameters behind the verdict, then further details
ParameterCalcEngineerPsychro Calc Pro
PriceFreeFree
Rating5.0 (2 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings2 — better—
Update frequencyEvery 2 days — betterEvery 4 days
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS1715.0 — better
Further details — not scored
Size10 MB23 MB
Age rating9+4+
DeveloperJustin BushMehmet Karakas

In-app purchases

None

CalcEngineer

No in-app purchases

2 purchases

Psychro Calc Pro

Subscriptions1
  • Monthly Premium3 Days trial$3.991 Month
One-time1
  • Lifetime Premium$9.99

Questions

Is CalcEngineer free?
CalcEngineer is free to download, with no in-app purchases.
Is Psychro Calc Pro free?
Psychro Calc Pro is free to download, with in-app purchases available.
Do CalcEngineer or Psychro Calc Pro have ads?
Neither CalcEngineer nor Psychro Calc Pro shows ads.
Which is updated more often, CalcEngineer or Psychro Calc Pro?
CalcEngineer ships an update every 2 days, and Psychro Calc Pro every 4 days. Most recently, CalcEngineer was updated on October 28, 2026 and Psychro Calc Pro on October 31, 2026.

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