# Sofia Kovalevskaya vs Optoelectronics

The clearest difference is price: Optoelectronics at Free against Sofia Kovalevskaya's $1.99. Optoelectronics also leads on update cadence (every 3 months vs every 26 months). Sofia Kovalevskaya's advantage is in-app purchases (none vs 6) and iOS requirement (15.6 vs 17.0). On ads and device support there is nothing between them.

Optoelectronics is free to download; Sofia Kovalevskaya costs $1.99 up front. Optoelectronics sells 6 in-app purchases, starting at $9.99 per month. Sofia Kovalevskaya asks for nothing beyond the download.

Sofia Kovalevskaya ships an update every 26 months, Optoelectronics every 3 months. The most recent releases landed on October 20, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Sofia Kovalevskaya | Optoelectronics |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 26 months | **Every 3 months** |
| Size | 30 MB | 24 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPad, Mac, Apple TV** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) |

## What reviewers say

### Sofia Kovalevskaya

[App page](https://appshunter.io/ios/app/sofia-kovalevskaya/id1447980726)

**Features:** Vision Pro support

**In-app purchases:** none


### Optoelectronics

[App page](https://appshunter.io/ios/app/optoelectronics/id6739937611)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month | $9.99 | per month |
| 6 Months | $19.99 | per 6 months |
| 1 Year | $29.99 | per year |
| 1500 | $0.99 | one-time |
| 3500 | $1.99 | one-time |
| 9000 | $3.99 | one-time |


## Frequently asked questions

### Is Sofia Kovalevskaya free?

Sofia Kovalevskaya costs $1.99, with no in-app purchases.

### Is Optoelectronics free?

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

### Do Sofia Kovalevskaya or Optoelectronics have ads?

Neither Sofia Kovalevskaya nor Optoelectronics shows ads.

### Which is updated more often, Sofia Kovalevskaya or Optoelectronics?

Sofia Kovalevskaya ships an update every 26 months, and Optoelectronics every 3 months. Most recently, Sofia Kovalevskaya was updated on October 20, 2026 and Optoelectronics on October 25, 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.*