# AI Writer vs Compress PDF

The clearest difference is ads: AI Writer at none against Compress PDF's shown. Compress PDF's advantage is update cadence (every 5 days vs every 2 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. AI Writer sells 7 in-app purchases, starting at $9.99 per 7 days and Compress PDF sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

AI Writer ships an update every 2 months, Compress PDF every 5 days. The most recent releases landed on October 23, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | AI Writer | Compress PDF |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (1.1K ratings)](https://appshunter.io/ios/app/ai-writer-writing-assistant/id1663626137/reviews)** | — |
| Number of ratings | **1.1K** | — |
| Positive reviews | 61.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 5 days** |
| Monetization | Free with in-app purchases | — |
| Size | 26 MB | 34 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [MasterMind Software LLC](https://appshunter.io/developer/674597403) | [Chaman Sharma](https://appshunter.io/developer/1896567203) |

## What reviewers say

### AI Writer

[App page](https://appshunter.io/ios/app/ai-writer-writing-assistant/id1663626137)

This AI-powered writing assistant helps you generate various types of text, from essays and emails to creative content and code. It also offers web search, summarization, translation, and grammar correction to enhance your writing and research process.

**Highlights:** AI writing assistant for essays, emails, blogs, AI search mode for real-time web answers, Summarizer and rewriter for text, Translator for multiple languages, Creative writing and code generation, Grammar and editing tools, Idea generator and templates

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AI Writer Pro | $9.99 | per 7 days |
| AI Writer Pro | $19.99 | per month |
| Secret Discount | $39.99 | per year |
| AI Writer Pro | $69.99 | per year |
| 50 AI Credits | $4.99 | one-time |
| 300 AI Credits | $19.99 | one-time |
| 1000 AI Credits | $59.99 | one-time |

**What reviewers like**

- 🙏 Great writing app and easy to use
- 👍 Can write a lot
- 👍 Best app ever! Very good!
- 👍 Great app for hw
- 👍 Lifesaver for students with learning disabilities

**What reviewers complain about**

- 🐛 Hard to understand, not easy at all
- 🔒 Can't find a setting to cancel trial
- 🔒 Can't even buy anything with it
- 🔒 Too limited and restricted, can't answer questions properly
- 🐛 No instructions or tutorial, can't get it to proofread

**Reported bugs**

- Login screen freezes
- Incompatible with older devices

**Requested features**

- Dark mode option
- Advanced analytics dashboard


### Compress PDF

[App page](https://appshunter.io/ios/app/compress-pdf-document-scanner/id6801993588)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads | $0.99 | one-time |


## Frequently asked questions

### Is AI Writer free?

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

### Is Compress PDF free?

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

### Do AI Writer or Compress PDF have ads?

Compress PDF shows ads; AI Writer does not.

### Which is updated more often, AI Writer or Compress PDF?

AI Writer ships an update every 2 months, and Compress PDF every 5 days. Most recently, AI Writer was updated on October 23, 2026 and Compress PDF on October 14, 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.*