Psychrometry Chart vs PE Prep Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Psychrometry Chart
This app calculates and displays thermodynamic properties of moist air mixtures. It supports both SI and imperial units, allowing users to find values like dry-bulb temperature, relative humidity, and enthalpy by interacting with a chart. It also computes thermal comfort parameters.
- Moist air property calculation
- SI and imperial unit support
- Interactive chart with reticle
- Displays dry-bulb temp, humidity, enthalpy
- Calculates PMV/PPD thermal comfort
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The application is a psychrometric chart. It accurately calculates and displays relevant thermodynamic air & water vapour mixture properties. Supports both SI and imperial unit systems By sliding the reticle within the graph the properties values for each corresponding graph point are instantly updated and displayed in the respective fields. In particular the following properties are shown: Dry-bulb temperature, Relative humidity, Wet bulb temperature, Specific enthalpy & Dew point. Additionally ISO-7730 PMV/PPD thermal comfort parameters are calculated.
PE Prep Pro
This comprehensive exam preparation system offers over 1,400 realistic practice questions across 16 engineering disciplines. It provides detailed performance analytics to pinpoint weak areas and includes essential code summaries for offline study.
- 1,400+ realistic exam questions
- 16 major engineering disciplines
- Performance analytics
- Offline functionality
- Essential code summaries
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This isn't just another study app - it's your complete PE exam success system designed by professional engineers. WHAT MAKES PE PREP PRO DIFFERENT: • 1,400+ REALISTIC exam questions across 16 major engineering disciplines • Questions based on codes & standards used in the real exam (ASCE 7, ACI 318, AISC, ASME BPVC, IEEE, NFPA, API, OSHA, EPA, and 25+ more) • Performance analytics to identify weak areas • 100% OFFLINE functionality - study anywhere, anytime COMPLETE DISCIPLINE COVERAGE: • Civil Engineering (Construction, Geotechnical, Structural, Transportation, Water Resources) • Mechanical Engineering (HVAC, Thermal/Fluids, Machine Design) • Electrical Engineering (Power Systems, Electronics & Controls, Computer Engineering) • Chemical Engineering • Structural Engineering • Nuclear Engineering • Petroleum Engineering • Environmental Engineering • Fire Protection Engineering • Control Systems Engineering • Mining & Mineral Processing • Metallurgical & Materials Engineering • Naval Architecture & Marine Engineering • Industrial & Systems Engineering • Architectural Engineering ESSENTIAL CODES & STANDARDS SUMMARIES INCLUDED: • ASCE 7 - Minimum Design Loads • ACI 318 - Structural Concrete Requirements • AISC Steel Construction Manual • International Building Code (IBC) • MUTCD - Traffic Control Devices • AASHTO Bridge Design Specifications • ASME BPVC - Boiler & Pressure Vessel Code • API Standards - Petroleum Industry • IEEE Standards - Electrical Systems • NFPA Codes - Fire Protection • OSHA (29 CFR) - Safety Regulations • EPA (40 CFR) - Environmental Compliance • NRC (10 CFR) - Nuclear Regulations • ASTM, ISO, SMACNA, NACE, ISA Standards PROVEN STUDY METHOD: Take diagnostic tests to identify knowledge gaps Study targeted practice questions with detailed explanations Reference essential code summaries and formulas instantly Track progress with detailed analytics Pass your PE exam with confidence START PASSING TODAY: Don't waste months with outdated study materials. PE Prep Pro gives you everything you need to pass your PE exam on the first try. Download now and start your path to Professional Engineer licensure. Download PE Prep Pro now and take the next step toward earning your P.E. license!
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Verdict
The clearest difference is price: Psychrometry Chart at $1.99 against PE Prep Pro's $34.99. Psychrometry Chart also leads on update cadence (every 2 weeks vs every 4 weeks). On review sentiment, ads, in-app purchases and monetization model 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
Psychrometry Chart costs $1.99 and PE Prep Pro $34.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Psychrometry Chart ships an update every 2 weeks, PE Prep Pro every 4 weeks. The most recent releases landed on October 20, 2026 and October 19, 2026 respectively.
| Parameter | Psychrometry Chart | PE Prep Pro |
|---|---|---|
| Price | $1.99 — better | $34.99 |
| Rating | — | 2.0 (2 ratings) — better |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 2 weeks — better | Every 4 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 3 MB | 31 MB |
| Age rating | 4+ | +4 |
| Developer | Konstantinos Ladiellis | Examp, LLC |
Customer experience
Psychrometry Chart
PE Prep Pro
In-app purchases
Psychrometry Chart
No in-app purchases
PE Prep Pro
No in-app purchases
Questions
Is Psychrometry Chart free?
Is PE Prep Pro free?
Do Psychrometry Chart or PE Prep Pro have ads?
Which is updated more often, Psychrometry Chart or PE Prep Pro?
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