# Tie Grading Guide vs PE Prep Pro

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.

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.

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.

## The numbers

| Metric | Tie Grading Guide | PE Prep Pro |
| --- | --- | --- |
| Price | **Free** | $34.99 |
| Rating | — | **[2.0 (2 ratings)](https://appshunter.io/ios/app/pe-prep-pro/id6746470072/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 13 months | **Every 3 weeks** |
| Monetization | — | Paid |
| Size | 36 MB | 31 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | +4 |
| Developer | [Western Wood Preservers Institute](https://appshunter.io/developer/656031899) | [Examp, LLC](https://appshunter.io/developer/1479303574) |

## What reviewers say

### Tie Grading Guide

[App page](https://appshunter.io/ios/app/tie-grading-guide/id1152624753)

**Features:** macOS Compatibility

**In-app purchases:** none


### PE Prep Pro

[App page](https://appshunter.io/ios/app/pe-prep-pro/id6746470072)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*