# Bunker One vs Saybolt Updates

The clearest difference is iOS requirement: Saybolt Updates at 12.0 against Bunker One's 15.6. 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.

Bunker One ships an update every 3 months, Saybolt Updates every 4 months. The most recent releases landed on October 16, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Bunker One | Saybolt Updates |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/bunker-one/id439589227/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Free | — |
| Size | 16 MB | 3 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Askapps](https://appshunter.io/developer/434706041) | [Saybolt International B.V.](https://appshunter.io/developer/493919167) |

## 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


### Saybolt Updates

[App page](https://appshunter.io/ios/app/saybolt-updates/id659391950)

**In-app purchases:** none


## Frequently asked questions

### Is Bunker One free?

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

### Is Saybolt Updates free?

Saybolt Updates is free to download, with no in-app purchases.

### Do Bunker One or Saybolt Updates have ads?

Neither Bunker One nor Saybolt Updates shows ads.

### Which is updated more often, Bunker One or Saybolt Updates?

Bunker One ships an update every 3 months, and Saybolt Updates every 4 months. Most recently, Bunker One was updated on October 16, 2026 and Saybolt Updates on October 10, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*