# Drillstring Toolbox vs Vapour Pressures

The clearest difference is review sentiment: Drillstring Toolbox at 100% against Vapour Pressures's 0%. Drillstring Toolbox also leads on price (Free vs $3.99) and rating (3.3 vs 2.0). Vapour Pressures's advantage is update cadence (every 6 months vs every 39 months). On ads, in-app purchases and device support there is nothing between them.

Drillstring Toolbox is free to download; Vapour Pressures costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Drillstring Toolbox holds the better App Store score, 3.3 against 2.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews point the same way: 100% of Drillstring Toolbox's written reviews are positive against 0% of Vapour Pressures's.

Drillstring Toolbox ships an update every 39 months, Vapour Pressures every 6 months. The most recent releases landed on November 2, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | Drillstring Toolbox | Vapour Pressures |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[3.3 (3 ratings)](https://appshunter.io/ios/app/drillstring-toolbox/id1068605189/reviews)** | [2.0 (1 ratings)](https://appshunter.io/ios/app/vapour-pressures/id6738324417/reviews) |
| Number of ratings | **3** | 1 |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 6 months** |
| Monetization | **Free** | Paid |
| Size | 1 MB | 14 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Bureau Veritas North America, Inc.](https://appshunter.io/developer/1770295442) | [Irving Josue Cortes Iturriaga](https://appshunter.io/developer/1750836580) |

## What reviewers say

### Drillstring Toolbox

[App page](https://appshunter.io/ios/app/drillstring-toolbox/id1068605189)

This utility app calculates drill-stem load capacities based on API connections and sizes. It also provides makeup torque and tensile capacity, as well as tensile and torsion capacities for drill pipe tubes.

**Highlights:** Drill-stem load capacity calculation, API connection selection, Makeup torque calculation, Tensile capacity calculation, Drill pipe tube capacities

**Features:** macOS Compatibility

**In-app purchases:** none


### Vapour Pressures

[App page](https://appshunter.io/ios/app/vapour-pressures/id6738324417)

Calculate vapor pressures and boiling points quickly and accurately with this tool. It features two extensive databases and supports various units, making it ideal for engineers, scientists, and students working with phase-change phenomena.

**Highlights:** Vapor pressure calculation, Boiling point calculation, Extensive substance databases, Support for multiple units, Multi-language support, No data collection

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

**In-app purchases:** none


## Frequently asked questions

### Is Drillstring Toolbox free?

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

### Is Vapour Pressures free?

Vapour Pressures costs $3.99, with no in-app purchases.

### Which has better reviews, Drillstring Toolbox or Vapour Pressures?

Drillstring Toolbox is rated higher. Drillstring Toolbox averages 3.3 out of 5 from 3 ratings, while Vapour Pressures averages 2.0 from 1 ratings.

### Do Drillstring Toolbox or Vapour Pressures have ads?

Neither Drillstring Toolbox nor Vapour Pressures shows ads.

### Which is updated more often, Drillstring Toolbox or Vapour Pressures?

Drillstring Toolbox ships an update every 39 months, and Vapour Pressures every 6 months. Most recently, Drillstring Toolbox was updated on November 2, 2026 and Vapour Pressures on November 11, 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.*