# Pressure Vessel Pro vs Fastener Dimensions

The clearest difference is rating: Pressure Vessel Pro at 4.5 against Fastener Dimensions's 2.3. Pressure Vessel Pro also leads on review sentiment (33% vs 0%). Fastener Dimensions's advantage is price ($4.99 vs $5.99). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

Pressure Vessel Pro costs $5.99 and Fastener Dimensions $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Pressure Vessel Pro holds the better App Store score, 4.5 against 2.3. Both are backed by a comparable volume of ratings — 2 and 3 respectively. Written reviews point the same way: 33% of Pressure Vessel Pro's written reviews are positive against 0% of Fastener Dimensions's.

Pressure Vessel Pro ships an update every 5 months, Fastener Dimensions every 6 months. The most recent releases landed on November 1, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Pressure Vessel Pro | Fastener Dimensions |
| --- | --- | --- |
| Price | $5.99 | **$4.99** |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/pressure-vessel-pro/id535696875/reviews)** | [2.3 (3 ratings)](https://appshunter.io/ios/app/fastener-dimensions/id6476143105/reviews) |
| Number of ratings | 2 | **3** |
| Positive reviews | **33.3% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 6 months |
| Monetization | Paid | Paid |
| Size | 10 MB | 62 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [J.R.Hobbs](https://appshunter.io/developer/395110523) | [Ajay Gorasiya](https://appshunter.io/developer/1455174866) |

## What reviewers say

### Pressure Vessel Pro

[App page](https://appshunter.io/ios/app/pressure-vessel-pro/id535696875)

Perform essential pressure vessel stress calculations with ease. Input dimensions for various tank geometries and instantly get results, including detailed formulae and ASME code compliance. Generate and share PDF reports with schematics.

**Highlights:** Pressure vessel stress calculations, ASME Boiler & Pressure Vessel Code compliance, Support for vertical, horizontal, and spherical tanks, Component stress calculations (cylinders, heads), Generate and share PDF reports, Flexible unit system (Metric/English), Save multiple calculation cases

**Features:** Vision Pro support

**In-app purchases:** none


### Fastener Dimensions

[App page](https://appshunter.io/ios/app/fastener-dimensions/id6476143105)

This app provides a comprehensive guide to various types of fasteners, including bolts, nuts, pins, and washers. Explore diverse options and dimensions to meet specific project requirements and enhance your understanding of these essential components.

**Highlights:** Dimensions of bolts, nuts, pins, and washers, Variety of bolt types (e.g., countersunk, hex head flange), Range of nut types (e.g., hex, wing), Intricacies of pin types (e.g., clevis, cylindrical, tapered), Choices of washer types (e.g., plain, spring), Guide for project requirements

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

**In-app purchases:** none


## Frequently asked questions

### Is Pressure Vessel Pro free?

Pressure Vessel Pro costs $5.99, with no in-app purchases.

### Is Fastener Dimensions free?

Fastener Dimensions costs $4.99, with no in-app purchases.

### Which has better reviews, Pressure Vessel Pro or Fastener Dimensions?

Pressure Vessel Pro is rated higher. Pressure Vessel Pro averages 4.5 out of 5 from 2 ratings, while Fastener Dimensions averages 2.3 from 3 ratings.

### Do Pressure Vessel Pro or Fastener Dimensions have ads?

Neither Pressure Vessel Pro nor Fastener Dimensions shows ads.

### Which is updated more often, Pressure Vessel Pro or Fastener Dimensions?

Pressure Vessel Pro ships an update every 5 months, and Fastener Dimensions every 6 months. Most recently, Pressure Vessel Pro was updated on November 1, 2026 and Fastener Dimensions on November 8, 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.*