# Notebox - Encrypted — D2D zero-knowledge encryption > Secure, block-based note-taking app with optional cloud sync. (iPhone/iPad app by Guap Inc..) - Source: https://appshunter.io/ios/app/notebox-encrypted/id1536532586 (this page in markdown: same URL + `.md`) - Developer: [Guap Inc.](https://appshunter.io/developer/1439069409) - Category: Productivity, Utilities - Price: Free with in-app purchases - Rating: 4.33/5 from 6 App Store ratings · 7 written reviews indexed - Age rating: 4+ - Requires: iOS 17.0 · 49 MB - Languages: English - Released: 2020-12-14 - Data updated: 2026-06-02 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/notebox-encrypted/id1536532586/reviews.md ## What is Notebox? # V2 Ultimate Privacy - All user data is stored with D2D zero-knowledge encryption - Block based flexible editor - Supports Markdown - Local-only use on iPhone, iPad and Mac is FREE. # Subscribe to Sync - Across all devices - Real time - Conflict-Free - Complete Security All personal data is stored in personal iCloud. All synchronization is processed on user device locally. --- privacy policy: https://notebox.cloud/privacy-policy terms of use: https://notebox.cloud/terms-of-use ## Key features - Zero-knowledge encryption - Block-based editor - Markdown support - Local-only mode - Cross-device sync - Real-time updates ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Yearly Cloud Subscription | $14.99 | per year | | Monthly Cloud Subscription | $1.49 | per month | ## Recent user reviews (7 of 7) All indexed reviews: https://appshunter.io/ios/app/notebox-encrypted/id1536532586/reviews.md ### 5/5 — Awesome! *2025-08-20* I love this app. I just hope the developer will continue to improve it or provide an update that will allow me to export all my notes from the cloud since I have a subscription. I have all my notes for years in this and don't want to loose them. **Developer response:** Thank you for your review! The formatting of pasted content should now be improved (from v3.7.0), regardless of whether it is copied from Bard, Gemini or another sources. ### 5/5 — Encrypt *2024-11-07* Thank You ### 5/5 — Love this app, it replaced apple notes for me and is fully encrypted!!! *2023-11-22* This app is great! I love that it is organized hierarchical with folders, sub folders, sub sub folders etc… and add a note at any level. It really has real potential and has replaced Apple Notes for me. I wish I understood how to use the editor better and someone would make a YouTube tutorial for it. I feel like I barely use much of its power. Also I wish the Paste function for things I copy from Bard stayed formatted like in Bard or like they do in Apple Notes. Also that bulleted item I pasted would NOT get duplicated and the formatting messed up. Beside those small bugs I love this app because its keeps my notes secure! **Developer response:** Thank you for your review! The formatting of pasted content should now be improved (from v3.7.0), regardless of whether it is copied from Bard, Gemini or another sources. ### 1/5 — This App Has Promise, But *2022-09-03* No export? **Developer response:** Sorry for being late. You can now export a note to Markdown, PDF or OS Print. ——— original response: Currently there is no exporting feature. But it's not that hard to add the feature. As other features development is in progress, however, the feature priority differs depending on whether it is a recoverable backup file or a read-only file in PDF or HTML format. Email us for details! support@notebox.cloud ### 5/5 — Superb *2022-01-10* Really awesome app & excellent UI. Very helpful to keep a running record of tasks, which is synchronised & securely shared readily accessible across all devices. Functionality is brilliant & the design is minamlist, but with unparalleled style. Would be appreciated to have further information & summarisation about the security architecture & its implementation in this application. An independent & impartial security audit & some form of certification would be helpful & a description of what (if any) propietary or open source code is being implemented, especially with relation to D2D zero knowledge encryption. Some further information & explanation about what specific "flavour" of D2D zero-knowledge encryption is being utilised & how that has been designed & is being applied would go further to enable users to understand & be further reassured. I have no reason to questiont the motives or legitimacy of the developers, but some of the above might prove to be popular & attract further customers! A future option of device 2FA with a Yubikey 5Ci (or similar product) would strengthen device authentication, authorisation & streamline accessibility. All in all, this app is excellent & really appreciated. Secure cloud based note sharing software is a godsend & it is at a reasonable price as well, which always makes the difference ! Highly recommended to one & all. Glad I found it, as it has suited my requirements perfectly. P.s. If some of information available already please provide it at your leisure ! **Developer response:** # Thank you for your review! In Feb. 2022, Notebox will ship more remarkable improvements. 1. UX/UI improvements on editor especially user-selection and block handling. 2. Spreadsheet and Kanban board. 3. Encryption management. 1. Change Recovery Key (Password) 2. Change Encryption Key with device whitelist 3. Recover Encryption Key with other device 4. Optional iCloud Keychain usage to store Encryption Key # About Notebox Notebox aims to create a multi-platform encrypted storage that is flexible and collaborative with great UX under D2D Encryption. Since no company has ever tried this, It was a challenge and I wasn't even sure if it is possible. Since there were several parts that were difficult to satisfy at the same time, rather than deciding on a specification and making a service, we have constructed a suitable specification and architecture while making a service. So, rather than fund-raising or getting more users, I have been working hard to make my work more perfect. As a result, Notebox is not informative! However, Notebox has completed a core that satisfies all of the above. Because we created a flexible data structure based on CRDT, modifications are merged at the client-end device without server-side dependence. (not overwriting!) And it is flexible enough to add tons of features. As the merge does not go through the server, there is no need to look up the data on the server. So, Notebox has no reason not to encrypt all data. # About Encryption cipher: ChaCha20-Poly1305 PK recovery layer: EPK, PK, Hash, Recovery Key(password) Data Storage: Notebox Server, iCloud 1. Upon first sign-up, a random private key is generated on the user's device through Apple CryptoKit Library. 1. With this PK, files such as user images and all note data are encrypted. 2. And the encrypted data is only stored in your private iCloud. 2. Derive a Hash through the user's recovery key and generate an EPK by encrypting the private key of 1 with this Hash through ChaCha20-Poly1305. 1. Only the EPK generated in this way is stored in the Notebox Server, and the PK, Hash, and Password are not saved. 2. Upon re-login, try to restore the PK by applying the process of 2 to the EPK sent from the Notebox Server in the reverse order. 3. The current PK is also stored in the user's Private iCloud Keychain in accordance with the guidelines of Apple SignIn(Additional password after apple sign-in should not be required) and in response to user's password loss. However, after the above mentioned, the features to make iCloud Keychain optional and delete the pre-stored PK will be added through Encryption Management. Because our encryption layer is completely modular, it will continue to evolve. Currently, we are considering the use of XChaCha20-Poly1305-IETF and Argon2, It seems to be applied only when it reaches a level that is sufficiently verified and reliable as Apple's officially provided CryptoKit Library and ChaCha20-Poly1305. In addition, we are currently using the user's private iCloud for data storage, however, there is a limitation on multi-platform and sync delay occurs for a few seconds, the use of a separate storage is also being considered. But all data is encrypted, so there would be only Pros without Cons. ## In summary In Notebox - Key generation, encryption and decryption - Data creation, encryption, decryption, and merging All of these are done on your device. Since only Zero-Knowledge Encrypted Data exists outside the user's device, Achieve D2D Zero-Knowledge Encryption. 1. Notebox server @purpose: Restoring the key on sign-in @data: The encryption key (EPK) @security: Without the user's Recovery Key, the raw key cannot be derived. 2. Your device @purpose: UX and speed @data: The raw key and raw data @security: If the device is not unlocked, it is encrypted at Apple's OS level. 3. Your Private iCloud @purpose: Synchronization @data: The encrypted data @security: Without the Encryption Key, the raw data cannot be derived. 4. Your Private iCloud Keychain @purpose: Recovery key loss and Apple-SignIn Guideline. @data: The user's PK is stored and @security: Unless an Apple admin hacks your personal iCloud Keychain, the raw key is not accessible. @tobe: This will be optional and user can delete existing PK. (You may use with change Encryption Key feature.) # Conclusion Notebox wants to spread to users in a more perfect state. Sufficient improvements will be made in this Q1. From Q2, Notebox become more user-friendly and informative step by step. Third-party audit, multi-platform, and collaboration are planned after funding, but even before that, we will post it on our website as scheduled. We will also add more features like 2FA one by one. Stay Tuned. ### 5/5 — Hidden Gem! Simple and Intuitive *2021-12-06* Fantastic note taker. I’m surprised this app is not on the top charts.. **Developer response:** Your praise makes me dance! Up to now, Notebox has focused on behind-the-scenes development rather than user extension. Thanks to these efforts, Notebox has both complete cryptographic security and functional flexibility based on robust code. From now on, more features like spreadsheet table and kanban board will be added. Stay tuned. ### 5/5 — Huge Potential *2021-05-15* If apple notes and evernote had a baby, this would be it. Simple, clean, but also has some powerful features. Can't go wrong with this one. **Developer response:** Thank you. We are currently rebuilding the editor area. 2.0 version will eliminate all bugs in the editor with fancy and flexible block-based components. We always protect user privacy with a zero-knoledge architecture. Stay tuned. ## Frequently asked questions about Notebox ### What is Notebox's encryption like? Notebox uses D2D zero-knowledge encryption for all user data, ensuring that only you can access your notes. This means even the developers cannot read your content. ### Is Notebox free to use? Yes, Notebox is free for local-only use on iPhone, iPad, and Mac. A subscription is required to enable cross-device synchronization. ### What are the subscription options for Notebox? Notebox offers a Monthly Cloud Subscription for $1.49/month with a 7-day free trial, and a Yearly Cloud Subscription for $14.99/year with a 1-month free trial. ### Does Notebox have ads? No, Notebox does not contain advertisements. The app is free for local use and offers a subscription for enhanced features. ### What devices does Notebox support? Notebox is available on Mac, iPhone, and iPad, allowing you to manage your notes across these Apple platforms. ### How often is Notebox updated? The latest version of Notebox is 3.7.1, and it was last updated on April 12, 2024. This indicates regular updates and maintenance. ### Can I export my notes from Notebox? While the description highlights Markdown support and a block-based editor, specific export formats are not detailed. However, Markdown support implies potential for exporting to various text-based formats. ### What is the age rating for Notebox? Notebox has an age rating of 4+, making it suitable for a wide range of users. The app's focus on privacy and organization is appropriate for younger users as well. ## Version history (last 5 releases) ### 3.7.1 — 2024-04-12 - fix(editor): bugs in text composition and modification ### 3.7.0 — 2024-02-27 - Improved formatting when pasting into notes ### 3.6.2 — 2023-10-02 - Fix bugs on account deletion ### 3.6.0 — 2022-10-16 - support multiline secrets on [other passwords] ### 3.5.16 — 2022-10-12 - Fixed occasional crashes during synchronization - Fixed list prefix font to monospace - Modified the interactive max-width of editors based on the device screen-size - Modified to Ignore markdown-keymap for block type in headers ## Apps similar to Notebox | App | Rating | Price | Category | | --- | --- | --- | --- | | [Encrypt-it](https://appshunter.io/ios/app/encrypt-it/id1482079558) | — | Free | Productivity | | [Thetis Tools](https://appshunter.io/ios/app/thetis-tools/id1460268980) | — | Free | Productivity | | [meslistes: a checklist app](https://appshunter.io/ios/app/meslistes-a-checklist-app/id1458475140) | 5.0 (3) | Free | Productivity | | [瑞大宝](https://appshunter.io/ios/app/id1455205260) | — | Free | Productivity | | [Collected Notes](https://appshunter.io/ios/app/collected-notes/id1511343960) | 4.7 (43) | Free | Productivity | | [Auer Notes](https://appshunter.io/ios/app/auer-notes/id1634205440) | 4.5 (8) | Free | Productivity | ## More apps by Guap Inc. - [10Game](https://appshunter.io/ios/app/10game/id1631476419) All apps by Guap Inc.: https://appshunter.io/developer/1439069409 ## Related topics [encrypted notes app](https://appshunter.io/ios/topics/encrypted-notes-app) · [encrypted notes](https://appshunter.io/ios/topics/encrypted-notes) --- *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 2026-06-02.*