# Drillstring Toolbox vs Oilfield Units Converter

The clearest difference is rating: Oilfield Units Converter at 5.0 against Drillstring Toolbox's 3.3. Oilfield Units Converter also leads on iOS requirement (10.3 vs 14.0). Drillstring Toolbox's advantage is ratings volume (3 vs 1). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Oilfield Units Converter holds the better App Store score, 5.0 against 3.3. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

Drillstring Toolbox ships an update every 39 months, Oilfield Units Converter every 24 months. The most recent releases landed on October 24, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Drillstring Toolbox | Oilfield Units Converter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.3 (3 ratings)](https://appshunter.io/ios/app/drillstring-toolbox/id1068605189/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/oilfield-units-converter/id1334718734/reviews)** |
| Number of ratings | **3** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 24 months** |
| Monetization | Free | Free |
| Size | 1 MB | 7 MB |
| Requires iOS | 14.0 | **10.3** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bureau Veritas North America, Inc.](https://appshunter.io/developer/1770295442) | [Carlos Moura](https://appshunter.io/developer/407501202) |

## 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


### Oilfield Units Converter

[App page](https://appshunter.io/ios/app/oilfield-units-converter/id1334718734)

This free utility app provides essential unit conversions for the oil and gas industry. It supports a wide range of common oilfield measurements, including area, capacity, density, and pressure. Users can request additional units via email.

**Highlights:** Area conversions, Capacity conversions, Density conversions, Pressure conversions, Temperature conversions, Flow rate conversions, Mass/Weight conversions

**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 Oilfield Units Converter free?

Oilfield Units Converter is free to download, with no in-app purchases.

### Which has better reviews, Drillstring Toolbox or Oilfield Units Converter?

Oilfield Units Converter is rated higher. Drillstring Toolbox averages 3.3 out of 5 from 3 ratings, while Oilfield Units Converter averages 5.0 from 1 ratings.

### Do Drillstring Toolbox or Oilfield Units Converter have ads?

Neither Drillstring Toolbox nor Oilfield Units Converter shows ads.

### Which is updated more often, Drillstring Toolbox or Oilfield Units Converter?

Drillstring Toolbox ships an update every 39 months, and Oilfield Units Converter every 24 months. Most recently, Drillstring Toolbox was updated on October 24, 2026 and Oilfield Units Converter on October 19, 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.*