# Memory Ark — Ebbinghaus Efficient Review

> Memory Ark: Ebbinghaus-based spaced repetition for efficient learning and memory retention. (iPhone/iPad app by 世超 徐.)

- Source: https://appshunter.io/ios/app/memory-ark/id6470735175 (this page in markdown: same URL + `.md`)
- Developer: [世超 徐](https://appshunter.io/developer/1688946625)
- Category: Productivity
- Price: Free with in-app purchases
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 15.0 · 6 MB
- Languages: English, Chinese
- Released: 2023-12-08
- Data updated: 2026-07-06
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/memory-ark/id6470735175/reviews.md

## What is Memory Ark?

The biggest challenge in memory is combating forgetting. Forgetting is a natural human tendency, and this principle was discovered long ago by Ebbinghaus, known as the famous Ebbinghaus Forgetting Curve. Our software incorporates the Ebbinghaus Curve to create detailed reminder plans. Users only need to complete their daily tasks on time to achieve long-term memory, making learning more efficient.

Learning itself is complex, and designing a simple and user-friendly app is our core principle.

Features of this software:
1. Today's Tasks: Review the intelligently scheduled daily tasks on time.  
2. Calendar Tasks: View the number of daily tasks at a glance for better planning.  
3. All Tasks: All tasks are grouped by status, keeping progress fully under control.  
4. Node Preview: Track detailed data on each review session for strategic planning.  
5. Custom Curve: Customize your memory curve based on personal habits—what suits you best.  
6. Task Tags: Categorize tasks systematically, with home page tasks displayed in tag order.  
7. Smart Postponement: Delayed task nodes are automatically rescheduled, preventing memory confusion.  
8. Retroactive Check-in: A powerful make-up feature—no matter how many days you missed, you can still check in.  

Auto-Renewable Subscription Service Description
Subscription Services:
Monthly Membership (Auto-Renewable Monthly)
Annual Membership (Auto-Renewable Yearly)
Subscription Prices:
Monthly Membership: $0.99/month (approx. 3 CNY)
Annual Membership: $2.99/year (approx. 18 CNY)
Payment: Payment will be charged to your iTunes account upon confirmation of purchase.
Auto-Renewal: Your iTunes account will be charged within 24 hours before the end of the current subscription period. Upon successful payment, the subscription period will be extended for another term.
Cancellation: You can turn off auto-renewal at any time by going to your iTunes/Apple ID settings at least 24 hours before the end of the current subscription period. No further charges will be applied after cancellation.

Contact Us:
If you encounter any issues, please contact us at: zhiledaoyuan@sina.com

Terms of Use:
https://www.yuque.com/zldy/ni1wwu/etyg8a76ok26n9c1

Privacy Policy:
https://www.yuque.com/zldy/ni1wwu/upx1vcs1g1ng60pr

## Key features

- Ebbinghaus Forgetting Curve integration
- Daily and calendar task management
- Task categorization with tags
- Detailed review session data
- Customizable memory curves
- Smart task rescheduling
- Retroactive check-in for missed tasks

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Annual Membership | $2.99 | per year |
| Monthly Membership | $0.99 | per month |



## Frequently asked questions about Memory Ark

### How does Memory Ark help with memory?

Memory Ark utilizes the Ebbinghaus Forgetting Curve to schedule reviews at optimal intervals, helping to combat forgetting and improve long-term memory retention. Users complete daily tasks to reinforce learning efficiently.

### What are the subscription options for Memory Ark?

Memory Ark offers a Monthly Membership for $0.99/month and an Annual Membership for $2.99/year. These are auto-renewable subscriptions designed to provide continuous access to premium features.

### Can I customize my review schedule in Memory Ark?

Yes, Memory Ark allows for a 'Custom Curve' feature, enabling users to personalize their memory curve based on their individual habits and learning preferences for a more tailored experience.

### What happens if I miss a review session in Memory Ark?

Memory Ark includes a 'Smart Postponement' feature that automatically reschedules delayed task nodes to prevent memory confusion. It also has a 'Retroactive Check-in' feature, allowing you to catch up on missed days.

### Is Memory Ark available on multiple devices?

Memory Ark is supported on iPhone, iPad, and iPod devices, making it accessible for users within the Apple ecosystem. The app is designed for a seamless experience across these platforms.

### How often is Memory Ark updated?

The latest version of Memory Ark is 1.5.4, and it was last updated on March 26, 2026. This indicates a commitment to ongoing development and improvements for the application.

### What is the age rating for Memory Ark?

Memory Ark has an age rating of 4+, making it suitable for a wide range of users, including younger learners. This rating suggests the content and interface are designed to be accessible and appropriate for children.

### Does Memory Ark have ads?

No, Memory Ark is ad-free. As the application is free with in-app purchases, users can enjoy an uninterrupted experience without advertisements.

## Version history (last 5 releases)

### 1.6.0 — 2026-06-25

1. Added a "Delayed Tasks" page that automatically aggregates overdue and unfinished tasks, with support for toggle control and custom delay day settings.
2. When completing overdue tasks from yesterday, two options—"Retroactive Check-in" and "Normal Completion"—are now available for greater operational flexibility.

### 1.5.4 — 2026-03-26

1. Optimize the sorting of tasks on the homepage. The sorting priority should be: Importance > Review Time > Completed Status.
2. Add an answer feature. When creating a task, users can enter an answer. The answer can be viewed in the task details, and edited when editing the task.
3. Fix known issues

### 1.5.3 — 2026-02-11

Fix known bugs

### 1.5.2 — 2026-02-02

1. Added task level settings on the Create Task and Edit Task pages, allowing users to set different levels based on importance.  
2. Added task level display on the homepage.  
3. Optimized the Create Task and Edit Task pages.  
4. Fixed known issues.

### 1.5.1 — 2025-09-05

1. Added new widget functionality - today's tasks can be displayed on the home screen. iOS 16 users can view tasks, while iOS 17 and above users can complete tasks directly from the home screen.
2. Optimized the content display in the all tasks list.

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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 2026-07-06.*