# Ester Formation vs Chemical Elements Practice

The clearest difference is price: Chemical Elements Practice at Free against Ester Formation's $1.99. Chemical Elements Practice also leads on update cadence (monthly vs every 61 months). Ester Formation's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement there is nothing between them.

Chemical Elements Practice is free to download; Ester Formation costs $1.99 up front. Chemical Elements Practice sells 1 one-off in-app purchase. Ester Formation asks for nothing beyond the download.

Ester Formation ships an update every 61 months, Chemical Elements Practice monthly. The most recent releases landed on May 14, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Ester Formation | Chemical Elements Practice |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[4.8 (39 ratings)](https://appshunter.io/ios/app/chemical-elements-practice/id1581952820/reviews)** |
| Number of ratings | — | **39** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 61 months | **Monthly** |
| Monetization | — | Free |
| Size | 223 MB | 30 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [VIRTUAL FILAMENTS PRIVATE LIMITED](https://appshunter.io/developer/1474217212) | [Philipp Straub](https://appshunter.io/developer/1573167056) |

## What reviewers say

### Ester Formation

[App page](https://appshunter.io/ios/app/ester-formation-edutech-era/id1539269877)

**Features:** macOS Compatibility

**In-app purchases:** none


### Chemical Elements Practice

[App page](https://appshunter.io/ios/app/chemical-elements-practice/id1581952820)

Master the periodic table with an adaptive learning system. This app uses spaced repetition and two distinct study modes to build long-term memory of element symbols, names, and relationships. Track your progress with category tests and access a full element browser.

**Highlights:** Adaptive spaced repetition, Multiple Choice mode, Self-Assessment mode, All 118 elements included, Category tests, Full card browser, Customizable study settings

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $3.99 | one-time |


## Frequently asked questions

### Is Ester Formation free?

Ester Formation costs $1.99, with no in-app purchases.

### Is Chemical Elements Practice free?

Chemical Elements Practice is free to download, with in-app purchases available.

### Do Ester Formation or Chemical Elements Practice have ads?

Neither Ester Formation nor Chemical Elements Practice shows ads.

### Which is updated more often, Ester Formation or Chemical Elements Practice?

Ester Formation ships an update every 61 months, and Chemical Elements Practice monthly. Most recently, Ester Formation was updated on May 14, 2026 and Chemical Elements Practice 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.*