# Formula Conversion vs College Chemistry Exam Prep

The clearest difference is update cadence: College Chemistry Exam Prep at every 4 months against Formula Conversion's every 26 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Formula Conversion sells 1 one-off in-app purchase and College Chemistry Exam Prep sells 9 in-app purchases, starting at $5.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Formula Conversion ships an update every 26 months, College Chemistry Exam Prep every 4 months. The most recent releases landed on October 27, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Formula Conversion | College Chemistry Exam Prep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 26 months | **Every 4 months** |
| Size | 2 MB | 53 MB |
| Requires iOS | **14.1** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Janek Soomets](https://appshunter.io/developer/1315295062) | [Exam Prep OU](https://appshunter.io/developer/1689642184) |

## What reviewers say

### Formula Conversion

[App page](https://appshunter.io/ios/app/formula-conversion/id1586539965)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade Formula Conversion | $3.99 | one-time |


### College Chemistry Exam Prep

[App page](https://appshunter.io/ios/app/college-chemistry-exam-prep/id6468661634)

**Features:** macOS Compatibility

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CLEP College Chemistry Weekly | $5.99 | per 7 days |
| CLEP College Chemistry Monthly | $14.99 | per month |
| Chemistry Monthly Free Trial | $17.99 | per month |
| CHEM Quarterly Full Access | $55.99 | per 3 months |
| CHEM Quarterly Full Access | $59.99 | per 3 months |
| CHEM Semiannual Full Access | $75.99 | per 6 months |
| CHEM Semiannual Full Access | $79.99 | per 6 months |
| CHEM Annual Full Access | $109.99 | per year |
| CHEM Annual Full Access | $119.99 | per year |


## Frequently asked questions

### Is Formula Conversion free?

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

### Is College Chemistry Exam Prep free?

College Chemistry Exam Prep is free to download, with in-app purchases available.

### Do Formula Conversion or College Chemistry Exam Prep have ads?

Neither Formula Conversion nor College Chemistry Exam Prep shows ads.

### Which is updated more often, Formula Conversion or College Chemistry Exam Prep?

Formula Conversion ships an update every 26 months, and College Chemistry Exam Prep every 4 months. Most recently, Formula Conversion was updated on October 27, 2026 and College Chemistry Exam Prep on October 30, 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.*