ASTM 54 B vs Gobius
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ASTM 54 B
This application calculates fuel weight for ships based on ASTM 54 B standards. Users input volume and observed temperature to receive precise calculations.
- ASTM 54 B fuel weight calculation
- Input volume and temperature
- Automatic calculation
- User-friendly interface
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SHIPS BUNKERING CALCULATION OF FUEL WEIGHT ACCORDING ASTM 54 B . ENTER TO APPLICATION VOLUME AND OBSERVED TEMPERATURE AND PROGRAM WILL CALCULATE EVERYTHING FOR YOU.
Gobius
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.
- Fluid level monitoring
- Volume display in % and liters
- Installation guides
- Tank calculator for non-rectangular tanks
- Visual fluid level indicators
- Waterproof sensor compatibility
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This app is designed to be used with the Gobius C and Gobius Pro sensors. The sensor is measuring sleeplessly from empty to full tank for all kinds of fluids. It gives you to volume in % and liters. The sensor is placed direct on top of the tank on plastic and glass fiber tanks. On metal tanks, you need a hole, at least 40 mm. Gobius C is ready to use; everything is in the box. You get the sensor with a 3M tape, a Quick Guide, 3M tissue, a cable to connect to a power source (12-24 V), and to use for external devices, like warning lights/buzzers, control systems, and analog gauges. The Quick Guide gives you a brief overview of installing the sensor. And the sensor is waterproof IP66. In the app you have everything; Installation Guide with instructions for mounting the sensor on the tank, setup/calculation and displaying the fluid level in different colors. The app has also a Tank Calculator for non-rectangular tanks, such as round and triangular tanks. Installation should take no longer than 15 minutes
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | ASTM 54 B | Gobius |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | — | 1.0 (2 ratings) — better |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 6 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 17.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 34 MB |
| Age rating | 4+ | 17+ |
| Developer | Oleksii Nezhalskyi | Gobius Sensor Technology AB |
Customer experience
ASTM 54 B
Gobius
In-app purchases
ASTM 54 B
No in-app purchases
Gobius
No in-app purchases
