CSiUnits vs mechanical design engine
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CSiUnits
This application provides a comprehensive tool for converting units across various scientific disciplines and everyday needs. It offers over 70 conversion options, catering to professionals, students, and anyone requiring precise unit transformations.
- Multiple one-time conversion lists
- Conversions for lifestyle and science
- Over 70 conversion options
- Numeric value input
- Converted values to all possible units
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CSiUnits is an app that helps in conversion of units. Target Users: • Individuals who need simple to complex unit conversion • Engineers, consultants and various professionals • Students and faculty Key Features: • Multiple one time conversion list • Conversions for various lifestyle needs and branches of science • More than 70 conversions to choose from Key Input: • Numeric value to be converted • Selected primary unit Key Output: • Converted values to all possible units
mechanical design engine
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* To calculate basic thickness of cylindrical/rectangular pressure vessel including heads if input data such as pressure, temperature, inner diameter and material information. * flange data can be easily searched. * Profile steel information such as pipe, H, W, I and U-Beam. * Raw material information, that is chemical composition and mechanical properties, for example, ASTM A240 316L, EN10297-1, SUS316L and so on. * Size and shape information of every thread(iso/unf/pf/pt) and shackles(bow/d-type) * To calculate force and moment of solid mechanics according to support type.
Screenshots
Verdict
The clearest difference is update cadence: CSiUnits at monthly against mechanical design engine's every 2 months. CSiUnits also leads on iOS requirement (9.0 vs 13.0). 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
CSiUnits ships an update monthly, mechanical design engine every 2 months. The most recent releases landed on September 17, 2026 and October 11, 2026 respectively.
| Parameter | CSiUnits | mechanical design engine |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (4 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Monthly — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 9.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 13 MB | 63 MB |
| Age rating | 4+ | 4+ |
| Developer | Computers and Structures, Inc. | gan dae choi |
In-app purchases
CSiUnits
No in-app purchases
mechanical design engine
No in-app purchases
Questions
Is CSiUnits free?
Is mechanical design engine free?
Do CSiUnits or mechanical design engine have ads?
Which is updated more often, CSiUnits or mechanical design engine?
Other comparisons
