# ASTM 54 B vs Gobius

The clearest difference is price: Gobius at Free against ASTM 54 B's $9.99. Gobius also leads on update cadence (monthly vs every 6 months) and iOS requirement (15.0 vs 17.6). On review sentiment, ads, in-app purchases and device support there is nothing between them.

Gobius is free to download; ASTM 54 B costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ASTM 54 B ships an update every 6 months, Gobius monthly. The most recent releases landed on October 8, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | ASTM 54 B | Gobius |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | — | **[1.0 (2 ratings)](https://appshunter.io/ios/app/gobius/id6471569744/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Monthly** |
| Monetization | Paid | **Free** |
| Size | 1 MB | 34 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Oleksii Nezhalskyi](https://appshunter.io/developer/1687730603) | [Gobius Sensor Technology AB](https://appshunter.io/developer/1422407278) |

## What reviewers say

### ASTM 54 B

[App page](https://appshunter.io/ios/app/astm-54-b/id6449903055)

This application calculates fuel weight for ships based on ASTM 54 B standards. Users input volume and observed temperature to receive precise calculations.

**Highlights:** ASTM 54 B fuel weight calculation, Input volume and temperature, Automatic calculation, User-friendly interface

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

**In-app purchases:** none


### Gobius

[App page](https://appshunter.io/ios/app/gobius/id6471569744)

This application works with specific sensors to monitor fluid levels in tanks, displaying volume in percentages and liters. It provides installation guides, tank calculators for various shapes, and visual level indicators.

**Highlights:** Fluid level monitoring, Volume display in % and liters, Installation guides, Tank calculator for non-rectangular tanks, Visual fluid level indicators, Waterproof sensor compatibility

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

**In-app purchases:** none


## Frequently asked questions

### Is ASTM 54 B free?

ASTM 54 B costs $9.99, with no in-app purchases.

### Is Gobius free?

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

### Do ASTM 54 B or Gobius have ads?

Neither ASTM 54 B nor Gobius shows ads.

### Which is updated more often, ASTM 54 B or Gobius?

ASTM 54 B ships an update every 6 months, and Gobius monthly. Most recently, ASTM 54 B was updated on October 8, 2026 and Gobius on October 12, 2026.

---

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