# Mark Bookmark vs LENGCEOI

The clearest difference is update cadence: Mark Bookmark at every 4 days against LENGCEOI's fortnightly. On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Mark Bookmark against 5.0 for LENGCEOI. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Mark Bookmark ships an update every 4 days, LENGCEOI fortnightly. The most recent releases landed on October 25, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Mark Bookmark | LENGCEOI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/mark-bookmark/id6756251684/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/lengceoi/id6759778715/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Fortnightly |
| Monetization | Free | Free |
| Size | 121 MB | 48 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Mark Inc](https://appshunter.io/developer/1859545872) | [Guangzhou Lingqu Electronic Science & Technology Co., Ltd.](https://appshunter.io/developer/1858443414) |

## What reviewers say

### Mark Bookmark

[App page](https://appshunter.io/ios/app/mark-bookmark/id6756251684)

Capture physical notes and ideas from books and printouts, turning them into organized insights. Automatically catalog your reading and search for specific passages. Chat with your highlights to trace ideas across different sources.

**Highlights:** Scan and save passages with high accuracy, Record voice notes without unlocking device, Automatic cataloging by book ISBN, Searchable library of captured content, AI chat with highlights and annotations, Integrations with Notion and Readwise, Offline capture and sync

**In-app purchases:** none


### LENGCEOI

[App page](https://appshunter.io/ios/app/lengceoi/id6759778715)

Transform your traditional air conditioner into a smart device. Control, automate, and monitor your AC remotely, set schedules, and track energy usage for increased comfort and efficiency.

**Highlights:** Remote AC control, Customizable automation scenes, Energy consumption tracking, Wi-Fi setup with ESP32 modules, Scheduled operations, Secure device connectivity

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

**In-app purchases:** none


## Frequently asked questions

### Is Mark Bookmark free?

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

### Is LENGCEOI free?

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

### Which has better reviews, Mark Bookmark or LENGCEOI?

Mark Bookmark and LENGCEOI are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Mark Bookmark or LENGCEOI have ads?

Neither Mark Bookmark nor LENGCEOI shows ads.

### Which is updated more often, Mark Bookmark or LENGCEOI?

Mark Bookmark ships an update every 4 days, and LENGCEOI fortnightly. Most recently, Mark Bookmark was updated on October 25, 2026 and LENGCEOI on October 1, 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.*