# ProMasters Only vs Shellie

The clearest difference is price: Shellie at Free against ProMasters Only's $69.99. Shellie also leads on rating (5.0 vs 4.5) and update cadence (every 2 days vs every 7 months). ProMasters Only's advantage is ratings volume (21 vs 1) and chart position (#127 vs unranked). On ads and in-app purchases there is nothing between them.

Shellie is free to download; ProMasters Only costs $69.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Shellie holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: ProMasters Only has 21 ratings behind it against 1, so its average is the more settled of the two.

ProMasters Only ships an update every 7 months, Shellie every 2 days. The most recent releases landed on September 13, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | ProMasters Only | Shellie |
| --- | --- | --- |
| Price | $69.99 | **Free** |
| Rating | [4.5 (21 ratings)](https://appshunter.io/ios/app/promasters-only/id6737483353/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/shellie/id6753881676/reviews)** |
| Number of ratings | **21** | 1 |
| Positive reviews | 78.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 days** |
| Monetization | Paid | **Free** |
| Best chart rank | **#127** | — |
| Size | 27 MB | 3 MB |
| Requires iOS | **15.6** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Kip Amore](https://appshunter.io/developer/1776662732) | [Peter Walker](https://appshunter.io/developer/1845456015) |

## What reviewers say

### ProMasters Only

[App page](https://appshunter.io/ios/app/promasters-only/id6737483353)

**Currently charting:** #127 Top Paid · Utilities (US App Store)

This app provides diagnostic tools and information specifically for Ram ProMaster vans. It offers real-time gauge monitoring, trouble code explanations, and a repair log, requiring a separate OBD dongle purchase.

**Highlights:** Trouble code reader with explanations, Real-time gauge monitoring (Voltage, Oil Pressure, Coolant Temp, etc.), Transmission fluid temperature gauge, Oil change and repair log book, Repair shop finder, Technical library with videos, Fluids and consumables specifications

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Shellie

[App page](https://appshunter.io/ios/app/shellie/id6753881676)

This utility app assists RV owners in leveling their vehicles. It provides a simple interface to ensure your RV is perfectly balanced for comfort and stability.

**Highlights:** RV leveling assistance, Vehicle balancing, Simple interface, Designed for Winnebago Travato

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ProMasters Only free?

ProMasters Only costs $69.99, with no in-app purchases.

### Is Shellie free?

Shellie is free to download, with no in-app purchases.

### Which has better reviews, ProMasters Only or Shellie?

Shellie is rated higher. ProMasters Only averages 4.5 out of 5 from 21 ratings, while Shellie averages 5.0 from 1 ratings.

### Do ProMasters Only or Shellie have ads?

Neither ProMasters Only nor Shellie shows ads.

### Which is updated more often, ProMasters Only or Shellie?

ProMasters Only ships an update every 7 months, and Shellie every 2 days. Most recently, ProMasters Only was updated on September 13, 2026 and Shellie on June 1, 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.*