# Tanker vs ENGINE SFC

The clearest difference is in-app purchases: ENGINE SFC at none against Tanker's 2. ENGINE SFC also leads on update cadence (daily vs monthly) and iOS requirement (15.2 vs 27.0). On price, ads and device support there is nothing between them.

Both are free to download. Tanker sells 2 one-off in-app purchases. ENGINE SFC asks for nothing beyond the download.

Tanker ships an update monthly, ENGINE SFC daily. The most recent releases landed on October 29, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Tanker | ENGINE SFC |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tanker-the-sounding-app/id1442173028/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 20 MB | 6 MB |
| Requires iOS | 27.0 | **15.2** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Pearson Smith](https://appshunter.io/developer/1268483172) | [Oleksii Nezhalskyi](https://appshunter.io/developer/1687730603) |

## What reviewers say

### Tanker

[App page](https://appshunter.io/ios/app/tanker-the-sounding-app/id1442173028)

This app streamlines the process of calculating marine fuel tank volumes. It eliminates the need for physical sounding tables and manual calculations, providing instant volume lookups with trim corrections automatically applied. Users can manage target fill levels, track fuel transfers, and share tables with their fleet.

**Highlights:** Instant volume lookups, Target fill level setting, CSV import and tank duplication, Unit conversion and safe fill percentages, Bunkering mode for real-time tracking, Offline functionality, Cloud sharing via TankerBase

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $4.99 | one-time |
| Tanker Pro Lifetime | $59.99 | one-time |


### ENGINE SFC

[App page](https://appshunter.io/ios/app/engine-sfc/id6469806252)

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

**In-app purchases:** none


## Frequently asked questions

### Is Tanker free?

Tanker is free to download, with in-app purchases available.

### Is ENGINE SFC free?

ENGINE SFC is free to download, with no in-app purchases.

### Do Tanker or ENGINE SFC have ads?

Neither Tanker nor ENGINE SFC shows ads.

### Which is updated more often, Tanker or ENGINE SFC?

Tanker ships an update monthly, and ENGINE SFC daily. Most recently, Tanker was updated on October 29, 2026 and ENGINE SFC 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.*