# mem — SRS Leitner System > Flashcard-based spaced repetition system for effective memorization. (iPhone/iPad app by Catalystwo.) - Source: https://appshunter.io/ios/app/mem/id777510569 (this page in markdown: same URL + `.md`) - Developer: [Catalystwo](https://appshunter.io/developer/1651079501) - Category: Reference, Education - Price: $4.99 - Rating: 4.40/5 from 22 App Store ratings · 34 written reviews indexed - Age rating: 17+ - Requires: iOS 13.0 · 14 MB - Languages: American English, Japanese, Māori - Released: 2014-02-15 - Data updated: 2026-08-27 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/mem/id777510569/reviews.md ## What is mem? "Leitner's System" is a memory tool designed by Sebastion Leitner in 1972, using flash cards to memorise words or phrases. It is a simple implementation of the principle of spaced repetition, where cards are reviewed at increasing intervals. "Hand Computer" app is designed to simulate the Leitner system and is a simple, convenient and effective memory tool for any foreign language student or simply a tool to help you study and remember any subject. When you find a word or phrase or equation you don't know, add it to a card after you have memorised it, then add the card to the first compartment. Review the cards in the first compartment a few times each day when you have time. If you still remember it, move the card to the next compartment. If you have forgotten it, put it back. After a few days or when the second compartment is full, review the cards in that compartment. If you have forgotten anything, put it back to the first compartment. The capacity of each compartment is optimised to recall your memory efficiently and effectively. The frequency you review each word increases as it proceeds through the compartments for more effective learning. The last compartment can hold as many cards as you want, but it is best that you review them from time to time. *If you are interested in this app, try "Cards" app from us.* For more information, please read: http://en.wikipedia.org/wiki/Spaced_repetition http://en.wikipedia.org/wiki/Leitner_system Launch URL scheme for this app comcatalystwohandcomputer Demo Video: http://vimeo.com/84745906 • Graphically visible stored cards to motivate you. • Non-proprietary file format... Documents are saved in plain text CSV file. • Synchronize via Dropbox. ... You can edit documents on your Mac/PC. • Night Mode is gentle on your eyes when studying in the middle of the night. • Listen to the word to improve your memory. = How to scan your own cards = 1. Tap “+” button to open “Add” page 2. Tap Camera button 3. Choose “Scan Multiple Cards” then follow the guide. = How to add multiple words using Dropbox = Prepare Mac/PC with Dropbox installed. Create a file like this… -------- Word1, Its definition Word2, Its definition Word3, Its definition . . . -------- Save this file in Hand Computer folder in Dropbox with csv extension. TECHNICAL INFORMATION This application includes Re-written in SceneKit with CAAnimation in version 2 instead of full CALayer + CoreAnimation in version 1. 59,000 lines of ObjC codes 6,900 lines of ORIGINAL Swift codes OpenCL image processing Supports Wacom Intuos Bamboo stylus using CoreBluetooth ## Key features - Spaced repetition system - Flashcard creation and review - Compartmentalized learning - Dropbox synchronization - Night mode - Audio pronunciation - Card scanning via camera ## Recent user reviews (10 of 34) All indexed reviews: https://appshunter.io/ios/app/mem/id777510569/reviews.md ### 3/5 — バグ *2024-12-09* 辞書を開こうとするとフリーズします。 ### 5/5 — 不具合 *2024-03-04* カード編集時の辞書から戻れなくなる ### 3/5 — Some suggestions *2022-01-09* That’s really user friendly app. It would be better to add a stack compartment to add as many as flash card to it and then start to learn. Also it’s better to let the user decides the size of first compartment. I hope to see some updates on this great app. Thank’s alot ### 3/5 — Bugs *2021-08-22* Hello I use this app for a long time But unfortunately it has loads of bugs Every time there is a new bug Why should such a good app has these bugs? ### 3/5 — 効果はすごい *2021-01-29* 赤マークが全然消えないのかイラつく ### 2/5 — いいんだけど *2021-01-23* 制度はすごくいいんだけど、すぐ画面が真っ暗になっていちいちアプリ立ち上げ直さなきゃいけない。流石にイライラします ### 2/5 — 前まではよかったのに… *2020-12-12* 1ヶ月前ほどからバグが発生しています。 赤マークのカードの最後の一枚を仕分けるとフリーズして何もできなくなります。その度に毎回タスクを切ってアプリを開き直さなければなりません。 **Developer response:** 今のバージョンではいかがでしょうか？ バッジの光が消える時に、iOS14では負荷がかかるようでした。GPUの種類によってはクラッシュ原因になっていたのかもと思い、修正により光を完全には消さないようにしました。負荷はかからないようになったため、クラッシュしたデバイスでも改善されたと思います。 ### 3/5 — バグが多い *2020-09-05* ちゃんとバグ取りしてるのか？すぐに落ちる コンセプトが良いだけに残念 **Developer response:** 現行バージョンはiOS13/14に対応致しました ### 4/5 — It’s good, but it could be better *2020-07-28* It could be nice if I could write with my pen in a card instead of typing. And also I don’t know why it lets me review all of the cards in every section. ### 2/5 — アプリを開くと落ちる *2020-07-12* アプリを開くと落ちる 単語のフォルダが表示されない **Developer response:** ※※※ 現行バージョンはiOS13/14に対応致しました ※※※ ## Frequently asked questions about mem ### How does mem work? mem utilizes the Leitner system, a spaced repetition method. You add flashcards, and the app prompts you to review them at increasing intervals based on how well you remember them, moving them between compartments. ### What is the price of mem? mem is a paid application priced at $4.99. This one-time purchase grants you access to all its features. ### Does mem have ads? No, mem does not contain advertisements. It is a paid application designed to provide an uninterrupted learning experience. ### What devices is mem available on? mem is available for iPhone, iPad, and iPod. It is designed to work across these Apple devices. ### How often is mem updated? The latest version of mem is 2.1.11, and it was last updated on September 13, 2024. This indicates regular maintenance and potential feature additions. ### Can I sync my mem cards with my computer? Yes, mem supports synchronization via Dropbox. This allows you to save your documents in a non-proprietary CSV file format and edit them on your Mac or PC. ### What is the age rating for mem? mem has an age rating of 17+. This is likely due to the mature content that users might input for memorization purposes. ### Can I scan physical flashcards into mem? Yes, mem allows you to scan your own cards using the camera function. You can then add them to the app for digital review. ## Version history (last 5 releases) ### 2.1.11 — 2024-09-13 Chaged keywords ### 2.1.10 — 2021-06-13 Fixed badge timing ### 2.1.7 — 2021-01-05 Fixed bugs in Card List table. ### 2.1.6 — 2020-12-27 improvements and bug fixes ### 2.1.5 — 2020-12-10 Bug fixes ## More apps by Catalystwo - [PocketWatch - 3D Clock](https://appshunter.io/ios/app/pocketwatch-3d-clock/id301408167) - [PictureWall](https://appshunter.io/ios/app/picturewall/id303700019) - [Quick Notes Widget](https://appshunter.io/ios/app/quick-notes-widget/id326099922) - [AirKey](https://appshunter.io/ios/app/airkey/id326418117) - [筆談パット](https://appshunter.io/ios/app/id367196546) - [New Zealand Nature Sounds](https://appshunter.io/ios/app/new-zealand-nature-sounds/id402639189) All apps by Catalystwo: https://appshunter.io/developer/1651079501 --- *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 2026-08-27.*