# Plagiarism Checker ! vs ISYS

The clearest difference is in-app purchases: ISYS at none against Plagiarism Checker !'s 7. ISYS also leads on iOS requirement (13.0 vs 15.0). Plagiarism Checker !'s advantage is update cadence (every 2 weeks vs every 8 months). On price, ads and device support there is nothing between them.

Both are free to download. Plagiarism Checker ! sells 7 in-app purchases, starting at $7.99 per month. ISYS asks for nothing beyond the download.

Plagiarism Checker ! ships an update every 2 weeks, ISYS every 8 months. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Plagiarism Checker ! | ISYS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.8 (33 ratings)](https://appshunter.io/ios/app/plagiarism-checker/id1602851751/reviews)** | — |
| Number of ratings | **33** | — |
| Positive reviews | 26.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 8 months |
| Monetization | Free with in-app purchases | — |
| Size | 5 MB | 46 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Muhammad Imran](https://appshunter.io/developer/1602851753) | [Youssef Alrakkib](https://appshunter.io/developer/1752023831) |

## What reviewers say

### Plagiarism Checker !

[App page](https://appshunter.io/ios/app/plagiarism-checker/id1602851751)

This app helps detect duplicate content by analyzing text or images. It's essential for ensuring originality in academic papers, website content, and professional writing to avoid penalties and maintain quality.

**Highlights:** Instant plagiarism checking, Fast and accurate results, Check by copy-pasting text, Check by uploading images, Real-time duplicate content detection, Natural Language Processing

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic Plan | $7.99 | per month |
| Standard Plan | $12.99 | per month |
| Premium Plan | $19.99 | per month |
| Add-On 50 Queries | $0.99 | one-time |
| Add-On 100 Queries | $2.99 | one-time |
| Add-On200 Queries | $4.99 | one-time |
| Lifetime Plan | $99.99 | one-time |


### ISYS

[App page](https://appshunter.io/ios/app/isys/id6504373295)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Plagiarism Checker ! free?

Plagiarism Checker ! is free to download, with in-app purchases available.

### Is ISYS free?

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

### Do Plagiarism Checker ! or ISYS have ads?

Neither Plagiarism Checker ! nor ISYS shows ads.

### Which is updated more often, Plagiarism Checker ! or ISYS?

Plagiarism Checker ! ships an update every 2 weeks, and ISYS every 8 months. Most recently, Plagiarism Checker ! was updated on November 3, 2026 and ISYS on November 4, 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.*