# PrepFE vs Thermo Jesus

The clearest difference is review sentiment: Thermo Jesus at 100% against PrepFE's 17%. Thermo Jesus also leads on rating (4.0 vs 2.0) and update cadence (every 3 weeks vs every 2 months). PrepFE's advantage is ratings volume (58 vs 4). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. PrepFE sells 6 one-off in-app purchases and Thermo Jesus sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Thermo Jesus holds the better App Store score, 4.0 against 2.0. That said, the two scores are not equally well evidenced: PrepFE has 58 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 17% of PrepFE's written reviews are positive against 100% of Thermo Jesus's.

PrepFE ships an update every 2 months, Thermo Jesus every 3 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | PrepFE | Thermo Jesus |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (58 ratings)](https://appshunter.io/ios/app/prepfe-fe-mechanical-prep/id1455746709/reviews) | **[4.0 (4 ratings)](https://appshunter.io/ios/app/thermo-jesus/id1543111036/reviews)** |
| Number of ratings | **58** | 4 |
| Positive reviews | 16.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 288 MB | 12 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [PrepFE, Inc.](https://appshunter.io/developer/1499557437) | [gitClimbing LLC](https://appshunter.io/developer/1484306358) |

## What reviewers say

### PrepFE

[App page](https://appshunter.io/ios/app/prepfe-fe-mechanical-prep/id1455746709)

Prepare for the FE Mechanical exam with practice problems and flashcards. Learn by doing with expert-curated content, track your progress, and identify areas for improvement. Study conveniently on your mobile device, anytime, anywhere.

**Highlights:** Practice FE exam questions, Interactive practice exams, Hundreds of practice questions, Detailed step-by-step explanations, Reinforce learning with flashcards, Breakdown of strengths and weaknesses

**Features:** Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Access Renewal | $47.99 | one-time |
| 1 Month Access | $59.99 | one-time |
| 3 Months Access Renewal | $61.99 | one-time |
| 6 Months Access Renewal | $75.99 | one-time |
| 3 Months Access | $79.99 | one-time |
| 6 Months Access | $99.99 | one-time |


### Thermo Jesus

[App page](https://appshunter.io/ios/app/thermo-jesus/id1543111036)

This app provides comprehensive summaries, practice quizzes, and detailed problem solutions for thermodynamics topics. It includes a water properties calculator and an indexed equation search for easy reference. Access pre-thermo and energy topics immediately.

**Highlights:** 45+ topic summaries, 300+ practice quiz questions, 40+ practice problems/solutions, Water properties calculator, Searchable thermodynamic equations, Immediate access to pre-thermo and energy topics

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $1.99 | per month |
| Semesterly (6 months) | $7.99 | per 6 months |
| Lifetime Access | $9.99 | one-time |


## Frequently asked questions

### Is PrepFE free?

PrepFE is free to download, with in-app purchases available.

### Is Thermo Jesus free?

Thermo Jesus is free to download, with in-app purchases available.

### Which has better reviews, PrepFE or Thermo Jesus?

Thermo Jesus is rated higher. PrepFE averages 2.0 out of 5 from 58 ratings, while Thermo Jesus averages 4.0 from 4 ratings.

### Do PrepFE or Thermo Jesus have ads?

Neither PrepFE nor Thermo Jesus shows ads.

### Which is updated more often, PrepFE or Thermo Jesus?

PrepFE ships an update every 2 months, and Thermo Jesus every 3 weeks. Most recently, PrepFE was updated on October 24, 2026 and Thermo Jesus on October 24, 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.*