# Conversions vs Functional Groups

The clearest difference is in-app purchases: Conversions at none against Functional Groups's 1. Conversions also leads on update cadence (weekly vs every 4 months) and iOS requirement (8.0 vs 15.0). On price, review sentiment, ads and device support there is nothing between them.

Both are free to download. Functional Groups sells 1 one-off in-app purchase. Conversions asks for nothing beyond the download.

Conversions ships an update weekly, Functional Groups every 4 months. The most recent releases landed on October 2, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Conversions | Functional Groups |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (21 ratings)](https://appshunter.io/ios/app/functional-groups/id1670252638/reviews)** |
| Number of ratings | — | **21** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 4 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 23 MB | 17 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Petr Zvonicek](https://appshunter.io/developer/501623515) | [Clarity Applications](https://appshunter.io/developer/1646120472) |

## What reviewers say

### Conversions

[App page](https://appshunter.io/ios/app/conversions-unit-conversion-practice/id1097032344)

Practice unit conversions with this adaptive educational app. It offers a variety of exercises covering length, mass, area, temperature, and currency conversions using metric and imperial systems.

**Highlights:** Adaptive learning exercises, Length, mass, and area conversions, Temperature conversion practice, Currency conversion exercises, Metric and imperial unit support

**Features:** macOS Compatibility

**In-app purchases:** none


### Functional Groups

[App page](https://appshunter.io/ios/app/functional-groups/id1670252638)

Master organic chemistry functional groups through an engaging and interactive learning experience. Ideal for students in introductory or advanced courses, MCAT prep, and A-Level chemistry, this app covers dozens of essential groups with practice modes and progress tracking.

**Highlights:** 25+ basic and advanced functional groups, 300+ organic compounds, Multiple practice modes, Customizable study groups, Personalized review, Reference table and definitions, Progress tracking with achievements

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Access | $9.99 | one-time |


## Frequently asked questions

### Is Conversions free?

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

### Is Functional Groups free?

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

### Do Conversions or Functional Groups have ads?

Neither Conversions nor Functional Groups shows ads.

### Which is updated more often, Conversions or Functional Groups?

Conversions ships an update weekly, and Functional Groups every 4 months. Most recently, Conversions was updated on October 2, 2026 and Functional Groups on October 11, 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.*