# I Know vs ReadCaddy

I Know and ReadCaddy are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. I Know sells 5 in-app purchases, starting at $9.99 per month and ReadCaddy sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

I Know ships an update every 4 days, ReadCaddy weekly. The most recent releases landed on October 8, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | I Know | ReadCaddy |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Weekly |
| Size | 32 MB | 49 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 17+ |
| Developer | [Proksi Yazılım](https://appshunter.io/developer/1739308877) | [Oren Lahav](https://appshunter.io/developer/1822632366) |

## What reviewers say

### I Know

[App page](https://appshunter.io/ios/app/i-know-book-summary/id6741852658)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Recurring! | $9.99 | per month |
| 3 Monthly Recurring! | $19.99 | per 3 months |
| Final Subscription | $39.99 | per year |
| Yearly Recurring! | $69.99 | per year |
| Trial Yearly Recurring! | $69.99 | per year |


### ReadCaddy

[App page](https://appshunter.io/ios/app/readcaddy/id6759986697)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ReadCaddy AI Text (Monthly) | $2.99 | per month |
| ReadCaddy AI Starter (Monthly) | $4.99 | per month |
| ReadCaddy AI Pro (Monthly) | $9.99 | per month |


## Frequently asked questions

### Is I Know free?

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

### Is ReadCaddy free?

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

### Do I Know or ReadCaddy have ads?

Neither I Know nor ReadCaddy shows ads.

### Which is updated more often, I Know or ReadCaddy?

I Know ships an update every 4 days, and ReadCaddy weekly. Most recently, I Know was updated on October 8, 2026 and ReadCaddy on October 7, 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.*