Comparison

Tie Grading Guide vs PE Prep Pro

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

Head to head
About

Tie Grading Guide

Features
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The RTA Tie Grading Guide offers detailed information and training on specifications, grades and limiting defects for preservative treated wood rail ties.

About

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.

Highlights
  • 1,400+ realistic exam questions
  • 16 major engineering disciplines
  • Performance analytics
  • Offline functionality
  • Essential code summaries
Features
Read full description

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!

Screenshots

Tie Grading Guide4 screens
PE Prep Pro4 screens

Verdict

The call

The clearest difference is price: Tie Grading Guide at Free against PE Prep Pro's $34.99. Tie Grading Guide also leads on iOS requirement (13.0 vs 15.1). PE Prep Pro's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 13 months). On 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

Tie Grading Guide is free to download; PE Prep Pro costs $34.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Tie Grading Guide ships an update every 13 months, PE Prep Pro every 3 weeks. The most recent releases landed on September 25, 2026 and September 2, 2026 respectively.

Scorecard4 real differences · 6 level
Tie Grading Guide versus PE Prep Pro: the parameters behind the verdict, then further details
ParameterTie Grading GuidePE Prep Pro
PriceFree — better$34.99
Rating—2.0 (2 ratings) — better
Positive reviews—0.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 13 monthsEvery 3 weeks — better
AdsYesNo — better
In-app purchasesNoNo
Monetization—Paid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.1
Further details — not scored
Size36 MB31 MB
Age rating12++4
DeveloperWestern Wood Preservers InstituteExamp, LLC

In-app purchases

None

Tie Grading Guide

No in-app purchases

None

PE Prep Pro

No in-app purchases

Questions

Is Tie Grading Guide free?
Tie Grading Guide is free to download, with no in-app purchases.
Is PE Prep Pro free?
PE Prep Pro costs $34.99, with no in-app purchases.
Do Tie Grading Guide or PE Prep Pro have ads?
Tie Grading Guide shows ads; PE Prep Pro does not.
Which is updated more often, Tie Grading Guide or PE Prep Pro?
Tie Grading Guide ships an update every 13 months, and PE Prep Pro every 3 weeks. Most recently, Tie Grading Guide was updated on September 25, 2026 and PE Prep Pro on September 2, 2026.

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