# Chemical Engineering AppSuite HD vs Opal

The clearest difference is price: Opal at Free against Chemical Engineering AppSuite HD's $0.99. Opal also leads on update cadence (every 5 days vs every 2 months) and ratings volume (90K vs 81). Chemical Engineering AppSuite HD's advantage is in-app purchases (none vs 18) and review sentiment (86% vs 61%). On rating, ads and monetization model there is nothing between them.

Opal is free to download; Chemical Engineering AppSuite HD costs $0.99 up front. Opal sells 13 in-app purchases, starting at $4.99 per 7 days. Chemical Engineering AppSuite HD asks for nothing beyond the download.

Opal holds the better App Store score, 4.7 against 4.6. That said, the two scores are not equally well evidenced: Opal has 90K ratings behind it against 81, so its average is the more settled of the two. Written reviews complicate that: 86% of Chemical Engineering AppSuite HD's written reviews are positive against 61% of Opal's, so the app with the better star average is not the one people write more warmly about.

Chemical Engineering AppSuite HD ships an update every 2 months, Opal every 5 days. The most recent releases landed on October 20, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Chemical Engineering AppSuite HD | Opal |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [4.6 (81 ratings)](https://appshunter.io/ios/app/chemical-engineering-appsuite-hd/id526158171/reviews) | **[4.7 (90K ratings)](https://appshunter.io/ios/app/opal-screen-time-control/id1497465230/reviews)** |
| Number of ratings | 81 | **90K** |
| Positive reviews | **86.1% of reviews** | 61.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | — | **#50** |
| Size | 46 MB | 306 MB |
| Requires iOS | **7.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Vector 254 LLC](https://appshunter.io/developer/821141755) | [Opal OS](https://appshunter.io/developer/1497465229) |

## What reviewers say

### Chemical Engineering AppSuite HD

[App page](https://appshunter.io/ios/app/chemical-engineering-appsuite-hd/id526158171)

This comprehensive app suite offers a vast array of tools for chemical engineers, chemists, and students. It includes unit converters, physical property calculations, thermodynamic equations, and specialized calculators for fluid dynamics and more. Access a chemical database, periodic table, and graphing tools.

**Highlights:** Steam table calculations, Chemical database (1000+ compounds), Extensive unit converters, Physical property calculations, Fluid dynamics & process control tools, Thermodynamic equations of state, Vapor-liquid equilibrium prediction

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

**In-app purchases:** none

**What reviewers like**

- 👍 Very useful for chemical engineering
- 💡 Extensive compound database
- 💡 Comprehensive unit converter
- 👍 Great for quick calculations
- 👍 Handy for students and professionals

**What reviewers complain about**

- 🐛 App crashes frequently
- 🐛 Converter issues
- 🐛 Incompatible with newer iOS versions
- 🐛 Some unit conversions are incorrect
- 🐛 Lacks some common compounds

**Reported bugs**

- App shuts down when using converter
- Conversion tables not working with new iOS versions
- Unit converter not working
- App crashes with iOS 11
- App crashes on iOS 7.x

**Requested features**

- Add Internal Energy
- Save imperial units as default
- Add more ranges for Antoine constants
- Functions for choosing equations of state
- Add conical frustum volume calculator


### Opal

[App page](https://appshunter.io/ios/app/opal-screen-time-control/id1497465230)

**Currently charting:** #50 Top Grossing · Productivity, #89 Top Free · Productivity (US App Store)

This app helps you regain control of your digital life by limiting app usage, blocking distractions, and improving focus. It provides tools and insights to reduce screen time, boost productivity, and enhance well-being.

**Highlights:** Screen time control, App blocker, Set app limits, Focus modes, Productivity reports, Block apps and websites, Mindful block screens

**Features:** Family Sharing

**In-app purchases (13)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Plan | $4.99 | per 7 days |
| Weekly Plan | $9.99 | per 7 days |
| Opal Student Weekly | $9.99 | per 7 days |
| Monthly Plan | $19.99 | per month |
| Monthly Plan | $19.99 | per month |
| Opal Pro Subscription | $49.99 | per year |
| Yearly Plan | $69.99 | per year |
| Yearly Plan | $89.99 | per year |
| Yearly Plan | $99.99 | per year |
| Yearly Plan | $99.99 | per year |
| Opal Pro Yearly | $99.99 | per year |
| Yearly Plan | $129.99 | per year |
| Yearly Plan | $179.99 | per year |

**What reviewers like**

- 👍 Helps reduce screen time
- 🚀 Effective at blocking distracting apps
- 💡 Customizable blocking schedules
- 🎨 Aesthetically pleasing design
- 🔒 Difficult to bypass blocks

**What reviewers complain about**

- 💰 Expensive subscription
- 🐛 Buggy and unreliable at times
- 🔓 Easy to bypass blocks in some cases
- 🤯 Can be frustrating when blocks don't work as expected
- 🕰️ Longer wait times to take breaks

**Reported bugs**

- Blocks apps that are not selected
- Inconsistent behavior when ending focus sessions
- Crashes when trying to manage blocked apps
- VPN issues causing other connectivity problems

**Requested features**

- Allow more customization of blocked apps
- Integrate with more productivity tools
- Provide more granular time tracking and reporting
- Offer a one-time purchase option
- Improve stability and reduce bugs


## Frequently asked questions

### Is Chemical Engineering AppSuite HD free?

Chemical Engineering AppSuite HD costs $0.99, with no in-app purchases.

### Is Opal free?

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

### Which has better reviews, Chemical Engineering AppSuite HD or Opal?

Opal is rated higher. Chemical Engineering AppSuite HD averages 4.6 out of 5 from 81 ratings, while Opal averages 4.7 from 90K ratings.

### Do Chemical Engineering AppSuite HD or Opal have ads?

Neither Chemical Engineering AppSuite HD nor Opal shows ads.

### Which is updated more often, Chemical Engineering AppSuite HD or Opal?

Chemical Engineering AppSuite HD ships an update every 2 months, and Opal every 5 days. Most recently, Chemical Engineering AppSuite HD was updated on October 20, 2026 and Opal on October 24, 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.*