# Hole Volumes vs unit.

The clearest difference is price: Hole Volumes at Free against unit.'s $4.99. Hole Volumes also leads on in-app purchases (none vs 2). unit.'s advantage is update cadence (every 6 days vs every 5 months) and device support (3 vs 1). On ads there is nothing between them.

Hole Volumes is free to download; unit. costs $4.99 up front. unit. sells 2 one-off in-app purchases. Hole Volumes asks for nothing beyond the download.

Hole Volumes ships an update every 5 months, unit. every 6 days. The most recent releases landed on October 18, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Hole Volumes | unit. |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[4.0 (3 ratings)](https://appshunter.io/ios/app/hole-volumes/id645763976/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 6 days** |
| Monetization | Free | — |
| Size | 4 MB | 6 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ash Point Ltd.](https://appshunter.io/developer/567630274) | [APP LABS LLC](https://appshunter.io/developer/1846489907) |

## What reviewers say

### Hole Volumes

[App page](https://appshunter.io/ios/app/hole-volumes/id645763976)

This app calculates various oilfield volumes, including hole, annular, tubing, and displacement. Users input depth, casing, and tubing sizes to get quick results. It supports both metric and standard units and allows for custom pipe sizes.

**Highlights:** Calculate hole volumes, Calculate annular volumes, Calculate tubing volumes, Calculate displacement volumes, Supports metric and standard units, Custom pipe size entry

**Features:** Vision Pro support

**In-app purchases:** none


### unit.

[App page](https://appshunter.io/ios/app/unit-unit-converter/id6814284608)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 14-day Trial | Free | one-time |
| Full Unlock | $6.99 | one-time |


## Frequently asked questions

### Is Hole Volumes free?

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

### Is unit. free?

unit. costs $4.99, and also offers in-app purchases.

### Do Hole Volumes or unit. have ads?

Neither Hole Volumes nor unit. shows ads.

### Which is updated more often, Hole Volumes or unit.?

Hole Volumes ships an update every 5 months, and unit. every 6 days. Most recently, Hole Volumes was updated on October 18, 2026 and unit. on October 26, 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.*