# Impari PPP vs Functional Groups

The clearest difference is price: Functional Groups at Free against Impari PPP's $1.99. Functional Groups also leads on device support (3 vs 1). Impari PPP's advantage is in-app purchases (none vs 1) and update cadence (every 8 days vs every 4 months). On ads and iOS requirement there is nothing between them.

Functional Groups is free to download; Impari PPP costs $1.99 up front. Functional Groups sells 1 one-off in-app purchase. Impari PPP asks for nothing beyond the download.

Impari PPP ships an update every 8 days, Functional Groups every 4 months. The most recent releases landed on October 2, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Impari PPP | Functional Groups |
| --- | --- | --- |
| Price | $1.99 | **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 | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 4 months |
| Monetization | — | Free with in-app purchases |
| Size | 3 MB | 17 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [David Orgeman](https://appshunter.io/developer/1545166417) | [Clarity Applications](https://appshunter.io/developer/1646120472) |

## What reviewers say

### Impari PPP

[App page](https://appshunter.io/ios/app/impari-ppp/id1554866746)

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

**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 Impari PPP free?

Impari PPP costs $1.99, with no in-app purchases.

### Is Functional Groups free?

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

### Do Impari PPP or Functional Groups have ads?

Neither Impari PPP nor Functional Groups shows ads.

### Which is updated more often, Impari PPP or Functional Groups?

Impari PPP ships an update every 8 days, and Functional Groups every 4 months. Most recently, Impari PPP 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.*