# Memorization Techniques vs ChatPDF

The clearest difference is ads: Memorization Techniques at none against ChatPDF's shown. ChatPDF's advantage is update cadence (every 4 days vs every 10 days). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Memorization Techniques sells 1 one-off in-app purchase and ChatPDF sells 2 in-app purchases, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.

Memorization Techniques ships an update every 10 days, ChatPDF every 4 days. The most recent releases landed on October 5, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Memorization Techniques | ChatPDF |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (92 ratings)](https://appshunter.io/ios/app/chatpdf-chat-pdf-ai/id6742454061/reviews)** |
| Number of ratings | — | **92** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 10 days | **Every 4 days** |
| Monetization | — | Free with in-app purchases |
| Size | 196 MB | 41 MB |
| Requires iOS | **14.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | +4 | 4+ |
| Developer | [Man Hung Sun](https://appshunter.io/developer/1471605573) | [ChatPDF GmbH](https://appshunter.io/developer/1711436087) |

## What reviewers say

### Memorization Techniques

[App page](https://appshunter.io/ios/app/memorization-techniques/id1618263817)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade | $0.99 | one-time |


### ChatPDF

[App page](https://appshunter.io/ios/app/chatpdf-chat-pdf-ai/id6742454061)

This AI-powered tool allows you to ask questions and get summaries directly from your PDF documents. It supports multiple files, OCR, and multilingual interactions, making complex information easily accessible.

**Highlights:** Instant answers from PDFs, Quick document summaries, Chat with multiple PDFs, OCR for scanned documents, Multilingual support, Cross-device access

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plus Subscription | $14.99 | per month |
| ChatPDF Yearly Plus Plan | $89.99 | per year |


## Frequently asked questions

### Is Memorization Techniques free?

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

### Is ChatPDF free?

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

### Do Memorization Techniques or ChatPDF have ads?

ChatPDF shows ads; Memorization Techniques does not.

### Which is updated more often, Memorization Techniques or ChatPDF?

Memorization Techniques ships an update every 10 days, and ChatPDF every 4 days. Most recently, Memorization Techniques was updated on October 5, 2026 and ChatPDF on October 16, 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.*