# Parent SDU vs Zachet

The clearest difference is in-app purchases: Parent SDU at none against Zachet's 4. Parent SDU also leads on iOS requirement (13.0 vs 17.0). Zachet's advantage is update cadence (every 4 days vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Zachet sells 4 in-app purchases, starting at $17.99 per month. Parent SDU asks for nothing beyond the download.

Parent SDU ships an update every 3 weeks, Zachet every 4 days. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Parent SDU | Zachet |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (47 ratings)](https://appshunter.io/ios/app/zachet-ai-study-assistant/id6804271331/reviews)** |
| Number of ratings | — | **47** |
| Positive reviews | — | 83.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Monetization | — | Freemium |
| Size | 20 MB | 65 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 9+ | 12+ |
| Developer | [SDUTechnopark](https://appshunter.io/developer/1326481043) | [Aleksei Miagkov](https://appshunter.io/developer/6804271333) |

## What reviewers say

### Parent SDU

[App page](https://appshunter.io/ios/app/parent-sdu/id6757148768)

**Features:** macOS Compatibility

**In-app purchases:** none


### Zachet

[App page](https://appshunter.io/ios/app/zachet-ai-study-assistant/id6804271331)

Transform lectures, articles, and documents into study aids. Generate summaries, flashcards, quizzes, mind maps, and podcasts from your uploaded content. Engage in AI-powered chat and voice discussions based on your notes.

**Highlights:** Summaries from audio, links, photos, and PDFs, Auto-generated flashcards and quizzes, Mind map creation for topic overview, Podcast summaries for on-the-go listening, AI chat and voice mode for interactive learning, Export notes to PDF and DOCX, Cross-device availability

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ПРО на месяц | $17.99 | per month |
| Про тариф на год | $109.99 | per year |
| Voice assistant for a week | $9.99 | one-time |
| Voice assistant for a month | $29.99 | one-time |


## Frequently asked questions

### Is Parent SDU free?

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

### Is Zachet free?

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

### Do Parent SDU or Zachet have ads?

Neither Parent SDU nor Zachet shows ads.

### Which is updated more often, Parent SDU or Zachet?

Parent SDU ships an update every 3 weeks, and Zachet every 4 days. Most recently, Parent SDU was updated on October 24, 2026 and Zachet 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.*