# PolyLearn Multilingual vs ZeroDay Dev

The clearest difference is in-app purchases: PolyLearn Multilingual at none against ZeroDay Dev's 1. PolyLearn Multilingual also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. ZeroDay Dev sells 1 one-off in-app purchase. PolyLearn Multilingual asks for nothing beyond the download.

PolyLearn Multilingual ships an update every 10 days, ZeroDay Dev weekly. The most recent releases landed on September 19, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | PolyLearn Multilingual | ZeroDay Dev |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (4 ratings)](https://appshunter.io/ios/app/zeroday-dev/id6760129673/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Weekly** |
| Monetization | — | Free |
| Size | 30 MB | 69 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [CHUNLONG LI](https://appshunter.io/developer/1864794193) | [John Lawniczak](https://appshunter.io/developer/1882793043) |

## What reviewers say

### PolyLearn Multilingual

[App page](https://appshunter.io/ios/app/polylearn-multilingual/id6757133856)

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

**In-app purchases:** none


### ZeroDay Dev

[App page](https://appshunter.io/ios/app/zeroday-dev/id6760129673)

Learn secure coding and blockchain security through hands-on challenges and real-world exploit analysis. Practice building exploit intuition with interactive exercises and track your progress through curated learning paths. The app is designed for offline use, allowing you to learn anytime, anywhere.

**Highlights:** Hands-on coding challenges, Real-world exploit analysis, Interactive practice exercises, Curated learning tracks, Progress tracking and gamification, Offline-first functionality

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Content | $4.99 | one-time |


## Frequently asked questions

### Is PolyLearn Multilingual free?

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

### Is ZeroDay Dev free?

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

### Do PolyLearn Multilingual or ZeroDay Dev have ads?

Neither PolyLearn Multilingual nor ZeroDay Dev shows ads.

### Which is updated more often, PolyLearn Multilingual or ZeroDay Dev?

PolyLearn Multilingual ships an update every 10 days, and ZeroDay Dev weekly. Most recently, PolyLearn Multilingual was updated on September 19, 2026 and ZeroDay Dev on September 18, 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.*