# Spaced vs PDF AI Reader

The clearest difference is price: Spaced at Free against PDF AI Reader's $1.19. PDF AI Reader's advantage is update cadence (every 5 days vs monthly). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Spaced is free to download; PDF AI Reader costs $1.19 up front. Spaced sells 3 in-app purchases, starting at $0.99 per month and PDF AI Reader sells 3 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Spaced ships an update monthly, PDF AI Reader every 5 days. The most recent releases landed on October 28, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Spaced | PDF AI Reader |
| --- | --- | --- |
| Price | **Free** | $1.19 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pdf-ai-reader/id6760606355/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 5 days** |
| Size | 356 MB | 836 MB |
| Requires iOS | **18.0** | 18.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Sam Woolf](https://appshunter.io/developer/1439593063) | [勋才 王](https://appshunter.io/developer/1492122934) |

## What reviewers say

### Spaced

[App page](https://appshunter.io/ios/app/spaced-language-learning/id6743569113)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $0.99 | per month |
| Premium | $5.99 | per year |
| Premium | $9.99 | one-time |


### PDF AI Reader

[App page](https://appshunter.io/ios/app/pdf-ai-reader/id6760606355)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly VIP | $1.99 | per 7 days |
| Monthly VIP | $5.99 | per month |
| Yearly VIP | $59.99 | per year |


## Frequently asked questions

### Is Spaced free?

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

### Is PDF AI Reader free?

PDF AI Reader costs $1.19, and also offers in-app purchases.

### Do Spaced or PDF AI Reader have ads?

Neither Spaced nor PDF AI Reader shows ads.

### Which is updated more often, Spaced or PDF AI Reader?

Spaced ships an update monthly, and PDF AI Reader every 5 days. Most recently, Spaced was updated on October 28, 2026 and PDF AI Reader on November 9, 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.*