Comparison

Bunker One vs Digital Bunker

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Bunker One

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
Read full description

This application by Bunker One, is a small practicable tool for look up the ISO 8217 - 2005, 2010/2012, 2017 & 2024 standards for residual- and distillate marine fuels. Programmed calculators are included for different fuel related calculations. Calculators programmed as below.: -CCAI Number according ISO 8217 -Cetan Index ASTM - D 976 - 80 (old method) ASTM - D 4737 - 87 (new method) -Deviation calculations according Bunker One -Energy and price relations according Bunker One -Fuel Blending - Viscosity blending according ASTM - D 7152 Sulphur blending according Bunker One -Injection temperature according Bunker One -Reproducibility -Specific Energy gross and net content according ISO 8217 -Viscosity Index according ASTM - D 341 -Volume Correction Factor according ASTM D1250-80 Table 5B General for all calculators is that all entries shall be in SI units. And results also given in SI units. Where there is a differentiation between Distillates and Residual fuels, distillates are defined with density lower than 900 kg/m3 Where there is a differentiation between Straight Run fuel and Cracked fuels, straight run fuels are defined with density lower than 950 kg/m3 News published on our web page Bunkerone.com will be pushed to the app holders and publish with link to the web under the "news" bar

About

Digital Bunker

Features
Read full description

E-Ship Safety™ is the first in a series of forms in the Digital Bunker app for the global Marine fuel market. E-Ship Safety™ streamlines the commercial maritime fueling process, saving time and money. The app creates comprehensive industry-standard and legally binding, pre-delivery documentation from a tablet or smart phone. Prior to fueling operations, a safety checklist is mandated at worldwide ports between physical suppliers and receiving vessel personnel. This checklist must comply with the standards outlined in the International Safety Guide for Oil Tankers & Terminals (ISGOTT 5th edition). E-Ship Safety™ eliminates the tedious task of downloading a PDF from a port’s website, printing it out, manually filling it in and then scanning it for email back to the local port jurisdiction. With the traditional paper method, there is the added burden of keeping track of both the electronic AND paper editions. E-Ship Safety™ automates this process by providing immediate documentation for the local port, the receiving vessel and the delivery bunker tanker, barge, truck (or pipeline) via an instantaneously emailed PDF to multiple stakeholders. The app includes GPS-embedded, bunker tanker, and vessel stamps (as photographic captures) with secure digital signatures from cargo officers, delivery personnel and vessel Chief Engineers. ISGOTT-compliant and ready for use in ports throughout the world, E-Ship Safety™ replaces the pen and paper approach to checklist documentation. The software works even without a cellular connection, uploading finished forms as soon as a cellular signal or Wi-Fi is acquired. As an added security feature, E-Ship Safety™ forms include time stamping as part of the PDF filename itself. E-Ship Safety™ eliminates the potential for loss or accidental destruction of paper originals; multiple stakeholders receive copies of the identical PDF documentation, and in our opinion, the app increases fuel transfer security. There is no “original” paper to misplace.

Screenshots

Bunker One4 screens
Digital Bunker4 screens

Verdict

The call

The clearest difference is update cadence: Digital Bunker at every 2 weeks against Bunker One's every 3 months. On price, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Bunker One ships an update every 3 months, Digital Bunker every 2 weeks. The most recent releases landed on October 16, 2026 and October 5, 2026 respectively.

Scorecard1 real difference · 8 level
Bunker One versus Digital Bunker: the parameters behind the verdict, then further details
ParameterBunker OneDigital Bunker
PriceFreeFree
Rating4.5 (2 ratings) — better—
Number of ratings2 — better—
Update frequencyEvery 3 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.6 — better16.1
Further details — not scored
Size16 MB43 MB
Age rating4+4+
DeveloperAskappsVortex Development Group

In-app purchases

None

Bunker One

No in-app purchases

None

Digital Bunker

No in-app purchases

Questions

Is Bunker One free?
Bunker One is free to download, with no in-app purchases.
Is Digital Bunker free?
Digital Bunker is free to download, with no in-app purchases.
Do Bunker One or Digital Bunker have ads?
Neither Bunker One nor Digital Bunker shows ads.
Which is updated more often, Bunker One or Digital Bunker?
Bunker One ships an update every 3 months, and Digital Bunker every 2 weeks. Most recently, Bunker One was updated on October 16, 2026 and Digital Bunker on October 5, 2026.

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