# OnKey vs Reader AI

The clearest difference is iOS requirement: Reader AI at 15.0 against OnKey's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. OnKey sells 2 in-app purchases, starting at $2.99 per 7 days and Reader AI sells 8 in-app purchases, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 18, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | OnKey | Reader AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/onkey-ai-keyboard-and-writer/id6478709879/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Freemium | — |
| Size | 35 MB | 15 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 9+ | 12+ |
| Developer | [HOPIN IT SP Z O O](https://appshunter.io/developer/1535528339) | [Thinking Systems LLC](https://appshunter.io/developer/1882858307) |

## What reviewers say

### OnKey

[App page](https://appshunter.io/ios/app/onkey-ai-keyboard-and-writer/id6478709879)

Enhance your writing with AI directly from your keyboard. Instantly fix grammar, adjust tone, translate messages, and generate complete emails or replies in seconds. Works across all your favorite messaging and email apps.

**Highlights:** AI-powered writing assistance, Instant tone transformation (16 tones), Generate complete emails and replies, Real-time translation (100+ languages), Flawless grammar correction (19 languages), Works across all apps

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly AI Keyboard | $2.99 | per 7 days |
| Monthly subscription | $6.99 | per month |


### Reader AI

[App page](https://appshunter.io/ios/app/reader-ai-markdown-reader/id6760142758)

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reader AI Weekly Access | $6.99 | per 7 days |
| Reader AI Monthly Access | $14.99 | per month |
| Reader AI Yearly Access | $89.99 | per year |
| 100 Credits | $4.99 | one-time |
| 300 Credits | $7.99 | one-time |
| 750 Credits | $14.99 | one-time |
| 500 Credits | $19.99 | one-time |
| 2000 Credits | $59.99 | one-time |


## Frequently asked questions

### Is OnKey free?

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

### Is Reader AI free?

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

### Do OnKey or Reader AI have ads?

Neither OnKey nor Reader AI shows ads.

### Which is updated more often, OnKey or Reader AI?

OnKey ships an update every 3 weeks, and Reader AI every 3 weeks. Most recently, OnKey was updated on October 18, 2026 and Reader AI on October 2, 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.*