# Steam Worx vs Obius

The clearest difference is in-app purchases: Steam Worx at none against Obius's 4. Steam Worx also leads on iOS requirement (15.0 vs 17.0). Obius's advantage is update cadence (weekly vs every 2 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Obius sells 4 in-app purchases, starting at $4.99 per month. Steam Worx asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Steam Worx against 5.0 for Obius. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Steam Worx ships an update every 2 months, Obius weekly. The most recent releases landed on September 30, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Steam Worx | Obius |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/steam-worx/id6467222774/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/obius-notes-that-evolve/id6760918821/reviews) |
| Number of ratings | **2** | 1 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | **Free** | Freemium |
| Size | 18 MB | 23 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Watson McDaniel Company](https://appshunter.io/developer/1708408873) | [Demetri Hodges](https://appshunter.io/developer/1886797794) |

## What reviewers say

### Steam Worx

[App page](https://appshunter.io/ios/app/steam-worx/id6467222774)

This application assists engineers and technicians with complex fluid dynamics calculations. It provides tools for sizing and selecting pressure relief valves, control valves for steam and water, and heat exchangers. The app also includes calculators for pipe sizing, noise levels, and unit conversions.

**Highlights:** Pilot-Operated PRV Sizing, Control Valve Sizing (Steam & Water), Heat Exchanger Sizing, Pipe Sizing & Velocities, Noise Level & Cavitation Calculations, Unit Conversions

**Features:** macOS Compatibility

**In-app purchases:** none


### Obius

[App page](https://appshunter.io/ios/app/obius-notes-that-evolve/id6760918821)

This app offers a visual workspace for organizing notes and ideas. It allows for reusable content blocks, color-coded sections for intent, and AI-powered features for content generation and semantic search. It prioritizes privacy with local-first storage and end-to-end encryption.

**Highlights:** Visual workspace for notes and ideas, Reusable content blocks (Loops), Color-coded sections by intent, AI-powered content generation and search, Version history and snapshots, Offline functionality and end-to-end encryption

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Obius Pro Founder | $4.99 | per month |
| Obius Pro Monthly | $9.99 | per month |
| Pro Annual | $79.99 | per year |
| Power Pack | $9.99 | one-time |


## Frequently asked questions

### Is Steam Worx free?

Steam Worx is free to download, with no in-app purchases.

### Is Obius free?

Obius is free to download, with in-app purchases available.

### Which has better reviews, Steam Worx or Obius?

Steam Worx and Obius are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Steam Worx or Obius have ads?

Neither Steam Worx nor Obius shows ads.

### Which is updated more often, Steam Worx or Obius?

Steam Worx ships an update every 2 months, and Obius weekly. Most recently, Steam Worx was updated on September 30, 2026 and Obius on October 5, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*