# iMark vs Knowing Body

The clearest difference is update cadence: iMark at every 9 days against Knowing Body's every 5 weeks. Knowing Body's advantage is iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

iMark ships an update every 9 days, Knowing Body every 5 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | iMark | Knowing Body |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/imark-digital-bookmarks/id1639049669/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 5 weeks |
| Monetization | Free | — |
| Size | 5 MB | 63 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Matan Reiman](https://appshunter.io/developer/1638955992) | [ZHIWEN YOU](https://appshunter.io/developer/1733993831) |

## What reviewers say

### iMark

[App page](https://appshunter.io/ios/app/imark-digital-bookmarks/id1639049669)

Easily manage your reading progress with digital bookmarks. Quickly return to your last page and track all the books you've read. Share your progress with friends and family.

**Highlights:** Manage digital bookmarks, Track reading progress, Add favorite bookmarks, View completed books, Siri voice command integration, Share reading progress

**Features:** macOS Compatibility

**In-app purchases:** none


### Knowing Body

[App page](https://appshunter.io/ios/app/knowing-body/id6747706587)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iMark free?

iMark is free to download, with no in-app purchases.

### Is Knowing Body free?

Knowing Body is free to download, with no in-app purchases.

### Do iMark or Knowing Body have ads?

Neither iMark nor Knowing Body shows ads.

### Which is updated more often, iMark or Knowing Body?

iMark ships an update every 9 days, and Knowing Body every 5 weeks. Most recently, iMark was updated on October 24, 2026 and Knowing Body on October 25, 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.*