Comparison

DWSIM Simulator vs Severe Service

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

Head to head
About

DWSIM Simulator

This app provides a powerful offline chemical process simulation tool. It allows engineers to build complex process models, perform thermodynamic calculations, and analyze various unit operations. Features include a touch-enabled PFD interface, extensive compound databases, and advanced calculation engines.

Highlights
  • Offline chemical process simulation
  • Touch-enabled PFD drawing interface
  • Extensive thermodynamic models
  • Compound database for 1500+ compounds
  • Unit operation models
  • Chemical reaction and reactor support
  • Flowsheet parametric studies
Features
Read full description

DWSIM Simulator is a Steady-State Chemical Process Simulator, featuring: - Offline functionality: no need to connect to online databases or servers, DWSIM runs completely offline on your device, wherever you are! - Touch-enabled Process Flowsheet Diagram (PFD) Drawing Interface: A hardware-accelerated PFD interface with touch support allows Chemical Engineers to build complex process models in a few minutes - VLE/VLLE/SVLE/SVLLE calculations using Equation of State and Activity Coefficient models: calculate fluid properties and phase distribution with advanced thermodynamic models - Compound database with extensive data for more than 1500 compounds - Rigorous Thermodynamic Models*: PC-SAFT EOS, GERG-2008 EOS, Peng-Robinson EOS, Soave-Redlich-Kwong EOS, Lee-Kesler-Plöcker, Chao-Seader, Modified UNIFAC (Dortmund), UNIQUAC, NRTL, Wilson, Raoult's Law and IAPWS-IF97 Steam Tables - Thermophysical state (phase) properties: Enthalpy, Entropy, Internal Energy, Gibbs and Helmholtz Free Energies, 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, Vapor Pressure, Heat of Vaporization, Ideal gas Enthalpy, Ideal gas Enthalpy of Formation at 25 C, Ideal Gas Gibbs Free Energy of Formation at 25 C, Ideal Gas Entropy, Heat Capacity Cp, Ideal Gas Heat Capacity, Liquid Heat Capacity, Solid Heat Capacity, Heat Capacity Cv, Liquid Viscosity, Vapor Viscosity, Liquid Thermal Conductivity, Vapor Thermal Conductivity, Solid Density, Liquid Density and Molecular Weight - Comprehensive Unit Operation Model set*, including Mixer, Splitter, Separator, Pump, Compressor, Expander, Heater, Cooler, Valve, Shortcut Column, Heat Exchanger, Component Separator, Pipe Segment, Rigorous Distillation and Absorption Columns, Wind Turbine, Hydroelectric Turbine, Water Electrolyzer and Solar Panel - Support for Chemical Reactions and Reactors*: DWSIM features support for Conversion, Equilibrium and Kinetic reactions, together with their respective Reactor models - Flowsheet Parametric Studies: Use the Sensitivity Analysis Tool to run automated parametric studies on your process model; The Flowsheet Optimizer tool can bring the simulation to an optimum state according to user-defined criteria; The Calculator tool can read flowsheet variables, perform math operations on them and write the results back to the flowsheet - Petroleum Characterization: Bulk C7+ and TBP Distillation Curve characterization tools enable creation of pseudocompounds to simulate petroleum processing facilities - Parallel multicore CPU calculation engine: a fast and reliable flowsheet solver that takes advantage of the multicore CPUs on modern mobile devices - Save/Load XML simulation files on the device or in the cloud - Export simulation results to PDF and Text documents * Some items are available through in-app purchases ABOUT CHEMICAL PROCESS SIMULATION Chemical Process Simulation is a model-based representation of chemical, physical, biological, and other technical processes and unit operations in software. Basic prerequisites are a thorough knowledge of chemical and physical properties of pure components and mixtures, of reactions, and of mathematical models which, in combination, allow the calculation of a process in a computing device. Process simulation software describes processes in flow diagrams where unit operations are positioned and connected by product or educt streams. The software has to solve the mass and energy balance to find a stable operating point. The goal of a process simulation is to find optimal conditions for a process.

About

Severe Service

This app helps users perform initial sizing for control valves, diagnose issues by selecting symptoms, and explore severe service applications across various industries. It also provides access to a technical library with videos and PDFs, a product catalog, and a contact feature for expert assistance.

Highlights
  • Control valve sizing tool
  • Issue diagnosis by symptom
  • Industry application explorer
  • Technical library with videos and PDFs
  • Fisher product catalog
  • Keyword search functionality
  • Direct contact with experts
Features
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App Features: • Sizing Tool: Quickly perform initial sizing for Fisher globe control valves. Share the results with anyone. • Diagnose an Issue: Choose the symptom that’s causing you headaches, then view Fisher products that combat the issue. • Industry Application: Access a list of severe service applications in Hydrocarbon, Power, and General Industries. • Technical Library: Keep up-to-speed on severe service issues by watching our videos and viewing PDFs. • Products: Browse thru an alphabetical listing of Fisher products and learn more about their functionality. • Search: Enter the first few letters of a keyword to easily find available topics and documents. • Contact Us: Submit a question, we have experts available to answer your questions at every step of the process.

Screenshots

DWSIM Simulator4 screens
Severe Service4 screens

Verdict

The call

The clearest difference is in-app purchases: Severe Service at none against DWSIM Simulator's 10. DWSIM Simulator's advantage is ratings volume (105 vs 7). On price, rating, update cadence and ads 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. DWSIM Simulator sells 10 one-off in-app purchases. Severe Service asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.6 for DWSIM Simulator against 4.7 for Severe Service. That said, the two scores are not equally well evidenced: DWSIM Simulator has 105 ratings behind it against 7, so its average is the more settled of the two.

UpkeepUpdate frequency

DWSIM Simulator ships an update every 6 weeks, Severe Service monthly. The most recent releases landed on September 13, 2026 and September 16, 2026 respectively.

Scorecard2 real differences · 8 level
DWSIM Simulator versus Severe Service: the parameters behind the verdict, then further details
ParameterDWSIM SimulatorSevere Service
PriceFreeFree
Rating4.6 (105 ratings)4.7 (7 ratings) — better
Positive reviews57.1% of reviews—
Number of ratings105 — better7
Update frequencyEvery 6 weeksMonthly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better13.2
Further details — not scored
Size106 MB26 MB
Age rating4+4+
DeveloperDaniel MedeirosEmerson Process Management

Customer experience

DWSIM Simulator

All ratings105 ratings
Positive91.4%
Neutral3.8%
Negative4.8%
Written reviews7 reviews
Positive57.1%
Neutral28.6%
Negative14.3%

Severe Service

All ratings7 ratings
Positive85.7%
Neutral14.3%
Negative0.0%

In-app purchases

10 purchases

DWSIM Simulator

One-time10
  • User-Defined Unit Set$1.99
  • Flowsheet Utilities Pack$2.99
  • Unit Operations Pack 1$2.99
Show 7 more
  • Unit Operations Pack 2$2.99
  • Unit Operations Pack 3$2.99
  • Activity Coeff. Model Pack$3.99
  • Equation of State Model Pack$3.99
  • Reactor Models Pack$4.99
  • Unlock All Features$9.99
  • Unlock All Features$39.99
None

Severe Service

No in-app purchases

Questions

Is DWSIM Simulator free?
DWSIM Simulator is free to download, with in-app purchases available.
Is Severe Service free?
Severe Service is free to download, with no in-app purchases.
Which has better reviews, DWSIM Simulator or Severe Service?
Severe Service is rated higher. DWSIM Simulator averages 4.6 out of 5 from 105 ratings, while Severe Service averages 4.7 from 7 ratings.
Do DWSIM Simulator or Severe Service have ads?
Neither DWSIM Simulator nor Severe Service shows ads.
Which is updated more often, DWSIM Simulator or Severe Service?
DWSIM Simulator ships an update every 6 weeks, and Severe Service monthly. Most recently, DWSIM Simulator was updated on September 13, 2026 and Severe Service on September 16, 2026.

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