# Bunker One vs Oilcalcs

The clearest difference is review sentiment: Oilcalcs at 100% against Bunker One's 0%. Oilcalcs also leads on rating (4.8 vs 4.5) and ratings volume (46 vs 2). Bunker One's advantage is price (Free vs $9.99). On update cadence, ads, in-app purchases and device support there is nothing between them.

Bunker One is free to download; Oilcalcs costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Oilcalcs holds the better App Store score, 4.8 against 4.5. That said, the two scores are not equally well evidenced: Oilcalcs has 46 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 0% of Bunker One's written reviews are positive against 100% of Oilcalcs's.

Bunker One ships an update every 3 months, Oilcalcs every 4 months. The most recent releases landed on October 23, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Bunker One | Oilcalcs |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | [4.5 (2 ratings)](https://appshunter.io/ios/app/bunker-one/id439589227/reviews) | **[4.8 (46 ratings)](https://appshunter.io/ios/app/oilcalcs/id612283154/reviews)** |
| Number of ratings | 2 | **46** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | **Free** | Paid |
| Size | 16 MB | 2 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Askapps](https://appshunter.io/developer/434706041) | [ron mooring](https://appshunter.io/developer/612283157) |

## What reviewers say

### Bunker One

[App page](https://appshunter.io/ios/app/bunker-one/id439589227)

This app provides a suite of calculators for marine fuel standards, including CCAI, Cetan Index, and blending calculations. It supports ISO 8217 and ASTM standards, with all inputs and outputs in SI units. Users can also access news and updates from the developer.

**Highlights:** ISO 8217 fuel standard lookup, CCAI Number calculation, Cetan Index calculation (old & new methods), Fuel blending calculators (viscosity, sulphur), Injection temperature calculation, Energy and price relation calculations, News updates from developer

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

**In-app purchases:** none


### Oilcalcs

[App page](https://appshunter.io/ios/app/oilcalcs/id612283154)

This app provides comprehensive calculations for professionals in the oil and gas industry. It offers versatile tools for volume and weight conversions, density corrections, and blending calculations, supporting various industry tables and units.

**Highlights:** Volume and weight conversions, Density correction for special applications, Viscosity, pour point, and flash point blender, LNG and LPG density calculators, Support for ASTM tables and units, Data export to database

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

**In-app purchases:** none


## Frequently asked questions

### Is Bunker One free?

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

### Is Oilcalcs free?

Oilcalcs costs $9.99, with no in-app purchases.

### Which has better reviews, Bunker One or Oilcalcs?

Oilcalcs is rated higher. Bunker One averages 4.5 out of 5 from 2 ratings, while Oilcalcs averages 4.8 from 46 ratings.

### Do Bunker One or Oilcalcs have ads?

Neither Bunker One nor Oilcalcs shows ads.

### Which is updated more often, Bunker One or Oilcalcs?

Bunker One ships an update every 3 months, and Oilcalcs every 4 months. Most recently, Bunker One was updated on October 23, 2026 and Oilcalcs 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.*