# O vs PaperStack CAIE Past Papers

The clearest difference is update cadence: PaperStack CAIE Past Papers at weekly against O's every 29 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. O sells 2 in-app purchases, starting at $0.99 per 3 months and PaperStack CAIE Past Papers sells 4 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

O ships an update every 29 months, PaperStack CAIE Past Papers weekly. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | O | PaperStack CAIE Past Papers |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (3 ratings)](https://appshunter.io/ios/app/paperstack-caie-past-papers/id6761936480/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 29 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 76 MB | 93 MB |
| Requires iOS | 15.6 | **15.5** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Albert Mungochi](https://appshunter.io/developer/1724993311) | [Salman Tariq](https://appshunter.io/developer/1892139840) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-level-mathematics-revision/id6478979508)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Quarterly | $0.99 | per 3 months |
| Premium Annual | $2.99 | per year |


### PaperStack CAIE Past Papers

[App page](https://appshunter.io/ios/app/paperstack-caie-past-papers/id6761936480)

Access over 15,000 CAIE past papers with an AI tutor and multiplayer revision modes. Practice by topic or year, solve MCQs interactively, and study offline.  Features include smart PDF viewing and annotation tools.

**Highlights:** 15,000+ CAIE past papers, AI Tutor with examiner insights, Real-time multiplayer revision, Topical paper generation, Interactive MCQ solver, Offline access, Smart PDF viewer with annotations

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $1.99 | per 7 days |
| Monthly Premium | $3.99 | per month |
| PaperStack Premium 6 Months | $24.99 | per 6 months |
| PaperStack Premium Yearly | $39.99 | per year |


## Frequently asked questions

### Is O free?

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

### Is PaperStack CAIE Past Papers free?

PaperStack CAIE Past Papers is free to download, with in-app purchases available.

### Do O or PaperStack CAIE Past Papers have ads?

Both O and PaperStack CAIE Past Papers show ads.

### Which is updated more often, O or PaperStack CAIE Past Papers?

O ships an update every 29 months, and PaperStack CAIE Past Papers weekly. Most recently, O was updated on November 4, 2026 and PaperStack CAIE Past Papers on October 31, 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.*