# ZipGrade vs World History Slots

The clearest difference is update cadence: World History Slots at every 5 days against ZipGrade's every 6 weeks. ZipGrade's advantage is rating (4.9 vs 4.5) and ratings volume (37K vs 4). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. ZipGrade sells 1 one-off in-app purchase and World History Slots sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ZipGrade holds the better App Store score, 4.9 against 4.5. That said, the two scores are not equally well evidenced: ZipGrade has 37K ratings behind it against 4, so its average is the more settled of the two.

ZipGrade ships an update every 6 weeks, World History Slots every 5 days. The most recent releases landed on November 10, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | ZipGrade | World History Slots |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (37K ratings)](https://appshunter.io/ios/app/zipgrade/id635077270/reviews)** | [4.5 (4 ratings)](https://appshunter.io/ios/app/world-history-slots/id6760600962/reviews) |
| Number of ratings | **37K** | 4 |
| Positive reviews | 85.9% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 5 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 30 MB | 5 MB |
| Requires iOS | **13.0** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ZipGrade LLC](https://appshunter.io/developer/582826575) | [BRIAN JAMES CORBETT](https://appshunter.io/developer/1885243761) |

## What reviewers say

### ZipGrade

[App page](https://appshunter.io/ios/app/zipgrade/id635077270)

Instantly grade multiple-choice tests and quizzes using your device's camera. This app offers a fast and accurate way for educators to assess student work, with features for organizing and exporting results. It provides immediate feedback to inform lesson planning and assignments.

**Highlights:** Instant grading with device camera, Supports multiple choice tests and quizzes, Organizes and exports results (PDF, Excel), Free answer sheet templates available, Companion website for data management, Stores results by student, subject, and quiz

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Add 1 year of use | $6.99 | one-time |

**What reviewers like**

- 🚀 Efficient grading
- 👍 Instant feedback for students
- 📊 Detailed data analysis
- 💰 Affordable subscription
- ⏱️ Time-saving

**What reviewers complain about**

- 🐛 Inconsistent scanning issues
- 🔍 Difficulty navigating interface
- 🔢 Lack of class/student grouping options
- 🖼️ Poor image quality for student names

**Reported bugs**

- Scanning issues with flat surface detection
- Incorrect answer marking due to eraser marks

**Requested features**

- Ability to change question point values in bulk
- Option to create/edit answer keys on website
- Support for non-multiple choice question types
- Improved data export/integration with other systems


### World History Slots

[App page](https://appshunter.io/ios/app/world-history-slots/id6760600962)

This app transforms AP World History study into a daily practice game. Spin reels to generate historical prompts and recall evidence before a timer runs out. Premium features offer AI-graded Short Answer Questions with instant feedback.

**Highlights:** Daily practice habit formation, Randomized era, region, theme prompts, Timed recall of historical evidence, AI-graded Short Answer Questions, Instant feedback scored to AP rubric, Progress tracking and awards

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic | $2.99 | per month |
| Standard | $4.99 | per month |
| AP Ready | $8.99 | per month |


## Frequently asked questions

### Is ZipGrade free?

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

### Is World History Slots free?

World History Slots is free to download, with in-app purchases available.

### Which has better reviews, ZipGrade or World History Slots?

ZipGrade is rated higher. ZipGrade averages 4.9 out of 5 from 37K ratings, while World History Slots averages 4.5 from 4 ratings.

### Do ZipGrade or World History Slots have ads?

Neither ZipGrade nor World History Slots shows ads.

### Which is updated more often, ZipGrade or World History Slots?

ZipGrade ships an update every 6 weeks, and World History Slots every 5 days. Most recently, ZipGrade was updated on November 10, 2026 and World History Slots on November 5, 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.*