Comparison

ProEngineer Calculator vs Reliability Pro

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

Head to head
About

ProEngineer Calculator

This app provides engineers and students with a comprehensive suite of tools for complex calculations across various engineering disciplines. It offers features for stoichiometry, thermodynamics, electrical, and fluid mechanics, along with process visualization and project management aids.

Highlights
  • Stoichiometry & Material Balances
  • Thermodynamics Calculations
  • Electrical Calculations
  • Flow Mechanics Calculator
  • Process Timeline
  • Consultant Directory
Features
Read full description

ProEngineer Calculator — Your Comprehensive Engineering Companion Engineered for professional engineers and engineering students alike, ProEngineering Calculator combines powerful tools and practical resources to tackle complex calculations and process management with ease. From chemical stoichiometry to electrical and flow mechanics, this app is built to optimize accuracy and efficiency in all your engineering tasks. Features that Empower Your Engineering Work: Stoichiometry & Material Balances: Perform precise chemical reaction and mass flow calculations for process design and analysis. Thermodynamics Calculations: Access essential formulas for heat transfer, energy balances, and thermodynamic properties. Process Flow Diagram (PFD) Reference: Visualize and reference standardized PFD symbols and conventions within the app. Electrical Calculations: Solve electrical circuit problems and perform power, voltage, and current assessments. Flow Mechanics Calculator: Analyze fluid flow, pressure drops, pump performance, and piping systems accurately. Process Timeline: Organize and plan process stages with clear, visual timelines. Consultant Directory: Locate and connect with industry experts to support your projects. Intuitive Interface: Designed for quick data input and immediate results — perfect for both on-site work and office environments. ProEngineering Calculator is an essential engineering toolkit for professionals in chemical, mechanical, process, and electrical engineering fields. Boost your productivity, minimize errors, and take your engineering projects to the next level. Download now to make engineering smarter, faster, and easier.

About

Reliability Pro

This app offers a comprehensive suite of over 75 professional tools for reliability, quality, and statistics analysis. It includes advanced features like life-data analysis, system modeling, and SPC control charts, all accessible on mobile devices with step-by-step tutorials and an AI assistant.

Highlights
  • 75+ reliability, quality, and statistics tools
  • AI assistant for tool discovery
  • Step-by-step video tutorials
  • Reference library with theory and formulas
  • Data import and export (PDF, text)
  • Verified tools against industry standards
Features
Read full description

Reliability Pro is a complete reliability, quality, and design-engineering workbench in your pocket — 165+ professional tools that normally live in expensive desktop software, ready in seconds. A problem that takes an hour on a desktop takes seconds here. CORE CAPABILITIES Life data analysis — Weibull and lognormal fitting, censoring, confidence bounds Accelerated life testing — Arrhenius, Coffin-Manson, and Power Law System modeling — reliability block diagrams, fault trees, and event trees Failure analysis — FMEA, FMECA, and FRACAS Statistics & DOE — ANOVA, regression, and a side-by-side plan-and-analyze DOE workbench Quality & SPC — control charts, process capability, Gage R&R, acceptance sampling Monte Carlo simulation Live sensor diagnostics — vibration, acoustic, shock, and motion NEW — RELIABILITY-CENTERED MAINTENANCE Decide what maintenance each failure mode needs, then set the interval: RCM Decision Worksheet — consequence and task-selection logic after SAE JA1011 Optimal Replacement Interval — the lowest-cost replacement age from Weibull data P-F Interval Planner — how often to inspect for condition monitoring Failure-Finding Interval — test intervals for relief valves, trips, and alarms Maintenance Strategy Comparison — run-to-failure vs time-based vs condition-based 2D FIELD SOLVERS Screen a real design, not just a formula — physics-of-failure solvers that feed a life model: Thermal CFD — board hot spots under airflow Thermal Cycling — solder-joint fatigue Moisture Ingress — popcorn-cracking risk Current-Density Field — electromigration from current crowding Enclosure Convection, Forced-Air Cooling, and Liquid Cold-Plate Galvanic Corrosion — penetration rate for dissimilar-metal joints DESIGN FOR RELIABILITY 45+ design-stage calculators, each framed by the failure mechanism it prevents: Fluids & flow — pressure drop, NPSH, valve sizing, water hammer, flow-induced vibration, two-phase flow Mechanical & structural — bolted joints, beam deflection, column buckling, Mohr's circle, tolerance stack-up Electrical & PCB — trace width, voltage drop, RC/RLC damping, battery runtime, creepage and clearance, derating Thermal — junction temperature, heat sinks, transient response, heat exchangers, fin efficiency, dew point Chemical & materials — corrosion rate, galvanic compatibility, MSL floor life Optical & photonics — fibre link budget, LED lumen maintenance, illuminance SEMICONDUCTOR RELIABILITY Electromigration, gate-oxide TDDB, BTI/HCI, die-attach and flip-chip fatigue, wirebonds, popcorn cracking, HTOL FIT, and acceleration factors WHO IT'S FOR Reliability, quality, maintenance, and design engineers; Six Sigma practitioners; students; and anyone who needs trustworthy results fast. WHAT YOU GET Every tool opens with a realistic example dataset Compare candidate models ranked by R² and AICc in curve fitting, degradation, and life-data analysis Basic Statistics tools are free for everyone; try any premium tool 5 times before signing in AI assistant and search to jump to the right tool Step-by-step video tutorials A reference library with theory, worked examples, key equations, and citations for every tool Import data and export a professional PDF report with theory, equations, a worked example, results, charts, and references Methods drawn from textbook formulas and published standards, with assumptions stated in every tool Missing a tool? Suggest one from inside the app SUBSCRIPTION Full access to all tools is available via an auto-renewing subscription (monthly or annual). Payment is charged to your Apple Account at confirmation of purchase. Your subscription renews automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in your Account settings. Privacy Policy: https://victorkunadian-web.github.io/privacy/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

ProEngineer Calculator4 screens
Reliability Pro4 screens

Verdict

The call

The clearest difference is price: Reliability Pro at Free against ProEngineer Calculator's $19.99. Reliability Pro also leads on update cadence (every 4 days vs monthly). ProEngineer Calculator's advantage is in-app purchases (none vs 2). On rating, review sentiment, ratings volume and ads 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

Reliability Pro is free to download; ProEngineer Calculator costs $19.99 up front. Reliability Pro sells 2 in-app purchases, starting at $14.99 per month. ProEngineer Calculator asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for ProEngineer Calculator against 5.0 for Reliability Pro. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

ProEngineer Calculator ships an update monthly, Reliability Pro every 4 days. The most recent releases landed on October 4, 2026 and October 5, 2026 respectively.

Scorecard4 real differences · 6 level
ProEngineer Calculator versus Reliability Pro: the parameters behind the verdict, then further details
ParameterProEngineer CalculatorReliability Pro
Price$19.99Free — better
Rating5.0 (1 ratings)5.0 (2 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings12 — better
Update frequencyMonthlyEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid — betterSubscription
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.115.0 — better
Further details — not scored
Size46 MB75 MB
Age rating4+4+
DeveloperMargaret HayesIllayathambi Kunadian

Customer experience

ProEngineer Calculator

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Reliability Pro

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

In-app purchases

None

ProEngineer Calculator

No in-app purchases

2 purchases

Reliability Pro

Subscriptions2
  • Reliability Pro Monthly14 Days trial$14.991 Month
  • Reliability Pro Annual14 Days trial$99.991 Year

Questions

Is ProEngineer Calculator free?
ProEngineer Calculator costs $19.99, with no in-app purchases.
Is Reliability Pro free?
Reliability Pro is free to download, with in-app purchases available.
Which has better reviews, ProEngineer Calculator or Reliability Pro?
ProEngineer Calculator and Reliability Pro are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.
Do ProEngineer Calculator or Reliability Pro have ads?
Neither ProEngineer Calculator nor Reliability Pro shows ads.
Which is updated more often, ProEngineer Calculator or Reliability Pro?
ProEngineer Calculator ships an update monthly, and Reliability Pro every 4 days. Most recently, ProEngineer Calculator was updated on October 4, 2026 and Reliability Pro on October 5, 2026.

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