Comparison

FluidProps vs D

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

Head to head
About

FluidProps

Features
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FluidProps is an app to calculate and display thermophysical data for chemical substances (fluids). It includes: - An interactive 3D molecule visualization tool - Compound database with extensive data for more than 1100 compounds (from ChemSep, CoolProp and ChEDL Thermo databases) - Thermophysical state (phase) properties: Compressibility Factor, Isothermal Compressibility, Bulk Modulus, Speed of Sound, Joule-Thomson Expansion Coefficient, Density, Molecular Weight, Heat Capacity, Thermal Conductivity and Viscosity - Single-compound properties: Critical Parameters, Acentric Factor, Chemical formula, Structure formula, CAS Registry Number, Boiling Point Temperature, Heat of Vaporization, Ideal gas Enthalpy, Ideal gas Enthalpy of Formation at 25 C, Ideal Gas Gibbs Free Energy of Formation at 25 C, Molecular Weight - Rigorous Thermodynamic Models: CoolProp, GERG-2008 EOS, Peng-Robinson EOS, Soave-Redlich-Kwong EOS, Raoult's Law and IAPWS-IF97 Steam Tables (for Water) - Export generated reports as Text or XLSX Spreadsheet files - Customizable system of units and number formatting - Offline calculations: this app works in offline mode. An internet connection is required for 3D molecule visualization only

About

D

Features
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Ā· Your digital assistant for ship management! It integrates features like BOSS dashboard, energy efficiency management, route optimization, Prognostics and Health Management, planned maintenance, smart warehousing, ship safety inspection, E-log, D-Knowledge, system management, crew management, and budget management. Ā· A wealth of pre-configured information, integrating essential technical documents for a one-stop service product that's ready to use right away. Ā· Utilizing technologies such as IoT, edge computing, AR, and AI to build a highly intelligent ship management platform. Ā· Shore-ship data synchronization, transparent processes, real-time management of ship dynamics, balancing efficiency and management. Ā· A free software solution for everyone, offering a management tool for mariners at no cost.

Screenshots

FluidProps4 screens
D3 screens

Verdict

The call

The clearest difference is price: D at Free against FluidProps's $0.99. FluidProps's advantage is update cadence (every 3 days vs every 2 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

D is free to download; FluidProps costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

FluidProps ships an update every 3 days, D every 2 months. The most recent releases landed on October 1, 2026 and October 6, 2026 respectively.

Scorecard2 real differences Ā· 4 level
FluidProps versus D: the parameters behind the verdict, then further details
ParameterFluidPropsD
Price$0.99Free — better
Update frequencyEvery 3 days — betterEvery 2 months
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better13.0
Further details — not scored
Size105 MB15 MB
Age rating4+4+
DeveloperDaniel MedeirosWinkong Marine Engineering Co.,Ltd.

In-app purchases

None

FluidProps

No in-app purchases

None

D

No in-app purchases

Questions

Is FluidProps free?
FluidProps costs $0.99, with no in-app purchases.
Is D free?
D is free to download, with no in-app purchases.
Do FluidProps or D have ads?
Neither FluidProps nor D shows ads.
Which is updated more often, FluidProps or D?
FluidProps ships an update every 3 days, and D every 2 months. Most recently, FluidProps was updated on October 1, 2026 and D on October 6, 2026.

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