# Functional Groups vs SLU SAFE

The clearest difference is in-app purchases: SLU SAFE at none against Functional Groups's 1. Functional Groups's advantage is update cadence (every 4 months vs every 21 months). On price, ads, device support and iOS requirement there is nothing between them.

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

Functional Groups ships an update every 4 months, SLU SAFE every 21 months. The most recent releases landed on September 13, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Functional Groups | SLU SAFE |
| --- | --- | --- |
| 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 | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 21 months |
| Monetization | Free with in-app purchases | — |
| Size | 17 MB | 31 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Clarity Applications](https://appshunter.io/developer/1646120472) | [Saint Louis University](https://appshunter.io/developer/377399050) |

## What reviewers say

### 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 |


### SLU SAFE

[App page](https://appshunter.io/ios/app/slu-safe/id6736794736)

**In-app purchases:** none


## Frequently asked questions

### Is Functional Groups free?

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

### Is SLU SAFE free?

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

### Do Functional Groups or SLU SAFE have ads?

Neither Functional Groups nor SLU SAFE shows ads.

### Which is updated more often, Functional Groups or SLU SAFE?

Functional Groups ships an update every 4 months, and SLU SAFE every 21 months. Most recently, Functional Groups was updated on September 13, 2026 and SLU SAFE on September 16, 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.*