# Правила русского языка + vs Биология синфи 9

The clearest difference is review sentiment: Правила русского языка + at 53% against Биология синфи 9's 0%. Правила русского языка + also leads on update cadence (every 2 months vs every 9 months). Биология синфи 9's advantage is in-app purchases (none vs 1) and iOS requirement (8.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Правила русского языка + sells 1 one-off in-app purchase. Биология синфи 9 asks for nothing beyond the download.

Правила русского языка + ships an update every 2 months, Биология синфи 9 every 9 months. The most recent releases landed on October 11, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Правила русского языка + | Биология синфи 9 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (27 ratings)](https://appshunter.io/ios/app/plus/id1169946909/reviews)** | — |
| Number of ratings | **27** | — |
| Positive reviews | **53.5% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 9 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 9 MB | 25 MB |
| Requires iOS | 17.0 | **8.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Aleksei Mezhevikin](https://appshunter.io/developer/466321873) | [Khurshed Gulov](https://appshunter.io/developer/1329538296) |

## What reviewers say

### Правила русского языка +

[App page](https://appshunter.io/ios/app/plus/id1169946909)

This app provides comprehensive rules of the Russian language with an intelligent search function. It's designed to help users understand and apply grammatical principles effectively. Contact developers via app settings for any inquiries.

**Highlights:** Russian language grammar rules, Intelligent search, Grammar explanations

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Полная версия приложения | $1.99 | one-time |


### Биология синфи 9

[App page](https://appshunter.io/ios/app/9/id1443517792)

This educational app provides detailed information on the internal structure of the human body, serving as a valuable resource for students and aspiring medical professionals. It features high-quality illustrations and interactive questions to reinforce learning.

**Highlights:** Detailed human body structure information, High-quality illustrations, Topic-based learning modules, End-of-topic review questions, Interactive learning through Q&A

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Правила русского языка + free?

Правила русского языка + is free to download, with in-app purchases available.

### Is Биология синфи 9 free?

Биология синфи 9 is free to download, with no in-app purchases.

### Do Правила русского языка + or Биология синфи 9 have ads?

Neither Правила русского языка + nor Биология синфи 9 shows ads.

### Which is updated more often, Правила русского языка + or Биология синфи 9?

Правила русского языка + ships an update every 2 months, and Биология синфи 9 every 9 months. Most recently, Правила русского языка + was updated on October 11, 2026 and Биология синфи 9 on September 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*