# Booksum: save your knowledge — Never forget what you learned

> Never forget what you learned (iPhone/iPad app by Trieu Tran.)

- Source: https://appshunter.io/ios/app/booksum-save-your-knowledge/id1609217360 (this page in markdown: same URL + `.md`)
- Developer: [Trieu Tran](https://appshunter.io/developer/1570476726)
- Category: Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 11.0 · 38 MB
- Languages: English
- Released: 2022-02-13
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/booksum-save-your-knowledge/id1609217360/reviews.md

## What is Booksum?

PROBLEM:

Did you remember useful ideas of books you read last month or last year? 
How many % do you remember? 
Maybe you noted them. 
But wait. They were lost? And you remember them only 1 percent ?

AH GOOD NEWS: 

99% book readers have the same problems as you. So do I. 
That is why this tool is designed to help you and me never forget what we learned. 
I promise.

BUT WHY:

Inspired by bestseller Ultralearning book (a book that helps you to retrieve information from memory better). This special app was designed to help you organize things you read leaner and memorize them longer.


HOW BOOKSUM WAS DESIGNED?

Rule 1: Imagine your content is organized in 3 layers. 
1.Books (like folders in your computer)
2.Chapters (like files in those folders)
3.Your content.
If everything is arranged this way, your content will be “tidier” and easier to find.

Rule 2: Notice that you should restate your useful ideas into question-answer. Don’t just jot down those ideas. Chances are you will forget to read it soon.

Rule 3: 3 flexible practice mechanisms:
1.for all books
2.for all chapters
3.for 1 chapter.
If you often use all-book mode, you will never what you read, even 5 years ago.

So don't mind. Just download and try. You'll judge.

*We offer 4 upgrade packages:
4.99$ For Each Month: $ 4.99 / 1 month
12.99$ For Each Month: $ 12.99 / 3 months
25.99$ For Each Month: $ 25.99 / 6 months
50.99$ For Each Month: $ 50.99 / 1 year

*Terms of Use: https://docs.google.com/document/d/1yEDyoGufVeT-NPZHEgve7wwWCz9ETuXVTG3up-718e0/edit?usp=sharing

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| 1 Month Subscription Plan | $4.99 | per month |
| 3 Months Subscription Plan | $13.99 | per 3 months |
| 6 Months Subscription Plan | $25.99 | per 6 months |
| 1 Year Subscription Plan | $50.99 | per year |



## Version history (last 1 release)

### 1.0 — 2022-02-13

No release notes.

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All apps by Trieu Tran: https://appshunter.io/developer/1570476726

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-19.*