Comparison

Mobile Multibody Dynamics vs Eng Fluids

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

Head to head
About

Mobile Multibody Dynamics

This app offers a graphical interface for mechanical engineers and physicists to model and simulate multibody dynamics. It bridges the gap between manual equation derivation and complex CAD-like software, serving as an educational tool for students and professionals.

Highlights
  • Graphical modeling interface
  • Simulation of multibody dynamics
  • Educational resource for engineering students
  • Export custom Python code
  • Accessible alternative to professional software
  • On-device modeling and analysis
Read full description

Mobile Multibody Dynamics (MOMDYN) is the first multibody dynamics app for iOS. MOMDYN provides an easy to use graphical interface that is familiar to mechanical engineers and physicists who have studied classical mechanics, with a powerful set of features similar to modern modeling and simulation software. The software forms a bridge between the"first-principles" approach to dynamics problem solving where one defines kinematic and dynamic equations by hand before developing custom code for each individual system, and the modern approach where the fundamental mathematical equations are hidden behind a purely graphical, computer aided design (CAD)-like interface. MOMDYN is an excellent educational resource for students enrolled in dynamics, vibration, or structural analysis coursework as part of a mechanical or aerospace engineering program. The modeling process and equations are all visible to the user, and you can even export custom Python code so you can simulate your system on a desktop. The app provides an entry point to learning multibody dynamics simulation, which will ease the learning curve for using modern scientific computing software. # Engineering and Physics Simulation in the Palm of Your Hand The creative instinct is one that we humans have little control over. While we would hope that our best ideas strike while we are best-equipped to take action, the reality is that they will frequently hit while we are laying in bed, riding on a train, or out for a walk. On some cases, they may even come while we are sitting in a boring meeting away from the comfort zone of our workstation. For most of us, our mobile devices are never more than a few feet away. MOMDYN lets you take action and build on your ideas in the moment, and watch them take motion in the palm of your hand. # An Entry Point For Dynamics Students and Professionals Multibody dynamics simulation is increasingly becoming an essential discipline for the development of complex mechanical systems. Recent years have seen the rise of many excellent software solutions, many belonging to larger multidisciplinary computer aided engineering packages. These products are great, expansive solutions that can be a pleasure to learn, use, and occasionally abuse. For many professionals, these provide for a lucrative career or business model. For others, the cost is a significant barrier to entry. MOMDYN presents an accessible alternative for engineering students or developing professionals who want to learn the basic principles behind how the advanced software works so they can feel confident in applying those tools in their future careers. # Build On Your Mobile Device, Analyze On A Desktop Your mobile device does a lot of amazing things, but no one would call it a high performance computer. Want to run your model once? No problem, MOMDYN has you covered. Want to run 100,000 cases in a Monte Carlo study? You’re going to want a professional workstation or computing cluster for that. This is advanced stuff, but MOMDYN can help: With the Export menu, you can choose to automatically generate Python source code that will replicate the same equations and parameters that you set up on your device, and can be executed in a Python environment using common and freely available packages. Want phase plots, frequency spectra, or to integrate your mechanism model with another physical or control system? If you can code it, you can do it.

About

Eng Fluids

Features
Read full description

Eng Fluids app provides real homework and test problems for the common engineering course called Statics. All problems are organized in sections and chapters common to most textbooks. Each problem has a complete solution with graphics to help you better understand how to solve the problem. Also, each problem has a link to a theory web page for that section at the online eBook (eCoursesBook.com). There is no cost for the online eBook, and it can be accessed outside of the app. The paid version ($2.99) has over 250 problems. There are no ads or in-app purchases. Network connection is required to run the app since all problems are pulled from an online database. Each problem is small (less than 20 k) and are vector-based graphics. All problems have been used in real engineering classes. Problems are accessed through an online database, so if any errors are identified, they will be updated and the app will use the corrected version. This program is copyrighted and cannot be distributed without the author's written consent.

Screenshots

Mobile Multibody Dynamics4 screens
Eng Fluids3 screens

Verdict

The call

The clearest difference is update cadence: Mobile Multibody Dynamics at monthly against Eng Fluids's every 13 months. Eng Fluids's advantage is iOS requirement (9.0 vs 16.0). 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

Mobile Multibody Dynamics ships an update monthly, Eng Fluids every 13 months. The most recent releases landed on September 16, 2026 and September 21, 2026 respectively.

Scorecard2 real differences · 8 level
Mobile Multibody Dynamics versus Eng Fluids: the parameters behind the verdict, then further details
ParameterMobile Multibody DynamicsEng Fluids
PriceFreeFree
Rating3.7 (6 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings6 — better—
Update frequencyMonthly — betterEvery 13 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.09.0 — better
Further details — not scored
Size111 MB21 MB
Age rating4+4+
DeveloperEliott RadcliffeKurt Gramoll

In-app purchases

None

Mobile Multibody Dynamics

No in-app purchases

None

Eng Fluids

No in-app purchases

Questions

Is Mobile Multibody Dynamics free?
Mobile Multibody Dynamics is free to download, with no in-app purchases.
Is Eng Fluids free?
Eng Fluids is free to download, with no in-app purchases.
Do Mobile Multibody Dynamics or Eng Fluids have ads?
Neither Mobile Multibody Dynamics nor Eng Fluids shows ads.
Which is updated more often, Mobile Multibody Dynamics or Eng Fluids?
Mobile Multibody Dynamics ships an update monthly, and Eng Fluids every 13 months. Most recently, Mobile Multibody Dynamics was updated on September 16, 2026 and Eng Fluids on September 21, 2026.

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