Comparison

Mobile Multibody Dynamics vs Eng Mechanics

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 Mechanics

This app offers a comprehensive collection of mechanics of materials problems and solutions, mirroring common textbook structures. It provides detailed explanations with graphics and links to an online eBook for further study. Access to all problems requires a paid upgrade.

Highlights
  • Mechanics of Materials problems
  • Complete solutions with graphics
  • Organized by textbook sections
  • Links to online eBook
  • Real engineering class problems
  • Updated error corrections
Features
Read full description

Eng Mechanics app provides real homework and test problems for the common engineering course called Mechanics of Materials, Deformable Bodies, or just Mechanics. 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 ($3.99) has over 400 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 Mechanics3 screens

Verdict

The call

The clearest difference is rating: Eng Mechanics at 4.7 against Mobile Multibody Dynamics's 3.7. Eng Mechanics also leads on review sentiment (75% vs 50%) and iOS requirement (9.0 vs 16.0). Mobile Multibody Dynamics's advantage is update cadence (monthly vs every 12 months) and monetization model (free vs free with in-app purchases). On price, ratings volume, ads and in-app purchases 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.

ReceptionRating · Positive reviews · Number of ratings

Eng Mechanics holds the better App Store score, 4.7 against 3.7. Both are backed by a comparable volume of ratings — 6 and 3 respectively. Written reviews point the same way: 50% of Mobile Multibody Dynamics's written reviews are positive against 75% of Eng Mechanics's.

UpkeepUpdate frequency

Mobile Multibody Dynamics ships an update monthly, Eng Mechanics every 12 months. The most recent releases landed on September 16, 2026 and September 9, 2026 respectively.

Scorecard5 real differences · 5 level
Mobile Multibody Dynamics versus Eng Mechanics: the parameters behind the verdict, then further details
ParameterMobile Multibody DynamicsEng Mechanics
PriceFreeFree
Rating3.7 (6 ratings)4.7 (3 ratings) — better
Positive reviews50.0% of reviews75.0% of reviews — better
Number of ratings6 — better3
Update frequencyMonthly — betterEvery 12 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.09.0 — better
Further details — not scored
Size111 MB21 MB
Age rating4+4+
DeveloperEliott RadcliffeKurt Gramoll

Customer experience

Mobile Multibody Dynamics

All ratings6 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews4 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

Eng Mechanics

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

In-app purchases

None

Mobile Multibody Dynamics

No in-app purchases

None

Eng Mechanics

No in-app purchases

Questions

Is Mobile Multibody Dynamics free?
Mobile Multibody Dynamics is free to download, with no in-app purchases.
Is Eng Mechanics free?
Eng Mechanics is free to download, with no in-app purchases.
Which has better reviews, Mobile Multibody Dynamics or Eng Mechanics?
Eng Mechanics is rated higher. Mobile Multibody Dynamics averages 3.7 out of 5 from 6 ratings, while Eng Mechanics averages 4.7 from 3 ratings.
Do Mobile Multibody Dynamics or Eng Mechanics have ads?
Neither Mobile Multibody Dynamics nor Eng Mechanics shows ads.
Which is updated more often, Mobile Multibody Dynamics or Eng Mechanics?
Mobile Multibody Dynamics ships an update monthly, and Eng Mechanics every 12 months. Most recently, Mobile Multibody Dynamics was updated on September 16, 2026 and Eng Mechanics on September 9, 2026.

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