UnitsConv vs smartHMI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
UnitsConv
This app provides conversion factors for 28 common properties used in multiphysics simulations and finite element analysis. It's a free tool designed for engineers and researchers working with complex physical models.
- 28 conversion properties
- Multiphysics simulation support
- Finite element analysis (FEA) focus
- Free to use
- Supports iPhone, iPad, and iPod
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Units conversion app with conversion factors for 28 properties commonly used in multiphysics simulations and finite element analysis (FEA).
smartHMI
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smartHMI mobile enables commissioning, operation and service of supported Siemens HVAC control systems. The app provides a mobile user interface for monitoring and managing connected systems throughout their lifecycle. The application includes sample dashboards and plant views for common HVAC applications. These can be exported, customized outside the app and re-imported to support additional system types and use cases. Features: . Connect locally via TCP/IP or USB, or remotely through Siemens cloud services. . Monitor system operation using application-specific graphics and dashboards. . Access and adjust controller functions from your mobile device. . Review active alarms and historic alarms. . Analyze trends and operational data. . Activate and deploy licenses to supported controllers.
Screenshots
Verdict
The clearest difference is update cadence: UnitsConv at every 4 months against smartHMI's every 7 months. 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.
UnitsConv ships an update every 4 months, smartHMI every 7 months. The most recent releases landed on September 10, 2026 and September 16, 2026 respectively.
| Parameter | UnitsConv | smartHMI |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (3 ratings) — better | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 4 months — better | Every 7 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 8 MB | 115 MB |
| Age rating | 4+ | 17+ |
| Developer | john selverian | Siemens AG |
In-app purchases
UnitsConv
No in-app purchases
smartHMI
No in-app purchases
Questions
Is UnitsConv free?
Is smartHMI free?
Do UnitsConv or smartHMI have ads?
Which is updated more often, UnitsConv or smartHMI?
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