# Chemical Solution Simple vs TOEFL Practice | Test

The clearest difference is price: TOEFL Practice | Test at Free against Chemical Solution Simple's $2.99. TOEFL Practice | Test also leads on update cadence (every 3 weeks vs every 3 months) and device support (4 vs 2). Chemical Solution Simple's advantage is in-app purchases (none vs 3). On rating, review sentiment, ratings volume and ads there is nothing between them.

TOEFL Practice | Test is free to download; Chemical Solution Simple costs $2.99 up front. TOEFL Practice | Test sells 3 in-app purchases, starting at $29.99 per 3 months. Chemical Solution Simple asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Chemical Solution Simple against 5.0 for TOEFL Practice | Test. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Chemical Solution Simple ships an update every 3 months, TOEFL Practice | Test every 3 weeks. The most recent releases landed on October 10, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Chemical Solution Simple | TOEFL Practice | Test |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/chemical-solution-simple/id1080912267/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/toefl-practice-test/id6471841387/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Paid | **Freemium** |
| Size | 1 MB | 126 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Roman Volinsky](https://appshunter.io/developer/977951850) | [志桂 李](https://appshunter.io/developer/1686507153) |

## What reviewers say

### Chemical Solution Simple

[App page](https://appshunter.io/ios/app/chemical-solution-simple/id1080912267)

This app assists in preparing chemical solutions through dissolution and dilution. It calculates moles, molar masses, required solute weights, and starting solution volumes, supporting various concentration units.

**Highlights:** Solution preparation by dissolution, Solution preparation by dilution, Mole calculation, Molar mass analysis, Required solute weight calculation, Starting solution volume calculation, Supports Molar, mM, uM, g/l, mg/l units

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

**In-app purchases:** none


### TOEFL Practice | Test

[App page](https://appshunter.io/ios/app/toefl-practice-test/id6471841387)

This app offers comprehensive preparation for the TOEFL exam, integrating listening, speaking, reading, and writing practice. It features AI-powered grammar and essay correction, along with real-time pronunciation assessment to help users improve their English skills and achieve high scores.

**Highlights:** English listening practice, Real-time speaking assessment, Smart AI grammar correction, Intelligent essay correction, Comprehensive TOEFL practice

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP | $29.99 | per 3 months |
| EliteAccess Monthly | $29.99 | per month |
| EliteAccess Year | $69.99 | per year |


## Frequently asked questions

### Is Chemical Solution Simple free?

Chemical Solution Simple costs $2.99, with no in-app purchases.

### Is TOEFL Practice | Test free?

TOEFL Practice | Test is free to download, with in-app purchases available.

### Which has better reviews, Chemical Solution Simple or TOEFL Practice | Test?

Chemical Solution Simple and TOEFL Practice | Test are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Chemical Solution Simple or TOEFL Practice | Test have ads?

Neither Chemical Solution Simple nor TOEFL Practice | Test shows ads.

### Which is updated more often, Chemical Solution Simple or TOEFL Practice | Test?

Chemical Solution Simple ships an update every 3 months, and TOEFL Practice | Test every 3 weeks. Most recently, Chemical Solution Simple was updated on October 10, 2026 and TOEFL Practice | Test on October 8, 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.*