# HiDuck vs Estudei

The clearest difference is in-app purchases: HiDuck at none against Estudei's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Estudei sells 1 in-app purchase, starting at $39.99 per year. HiDuck asks for nothing beyond the download.

HiDuck ships an update every 10 days, Estudei every 9 days. The most recent releases landed on October 25, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | HiDuck | Estudei |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (7 ratings)](https://appshunter.io/ios/app/estudei/id6740289500/reviews)** |
| Number of ratings | — | **7** |
| Positive reviews | — | 86.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 9 days** |
| Monetization | — | Free with in-app purchases |
| Size | 24 MB | 77 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | +4 |
| Developer | [Joao Mergulhao](https://appshunter.io/developer/1768313992) | [Estudei](https://appshunter.io/developer/1789384548) |

## What reviewers say

### HiDuck

[App page](https://appshunter.io/ios/app/hiduck-your-study-buddy/id6737779740)

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

**In-app purchases:** none


### Estudei

[App page](https://appshunter.io/ios/app/estudei/id6740289500)

Organize seus estudos com um planejamento personalizado, revisões estratégicas e acompanhamento de desempenho. Identifique dificuldades e navegue por editais de forma eficiente. Ideal para estudantes de todos os níveis que buscam otimizar seu tempo e maximizar a eficiência.

**Highlights:** Personalized study planning, Strategic revision scheduling, Performance indicators, Study time logging, Difficulty mapping, Verticalized syllabus navigation

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Subscription | $39.99 | per year |


## Frequently asked questions

### Is HiDuck free?

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

### Is Estudei free?

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

### Do HiDuck or Estudei have ads?

Neither HiDuck nor Estudei shows ads.

### Which is updated more often, HiDuck or Estudei?

HiDuck ships an update every 10 days, and Estudei every 9 days. Most recently, HiDuck was updated on October 25, 2026 and Estudei on October 30, 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.*