PrivateBin is a self-hosted, zero-knowledge pastebin web application. The PHP backend (Controller, Model, Data) handles paste/comment lifecycle, expiration, deletion, traffic limiting, and storage backend selection; the JavaScript frontend performs all encryption/decryption in the browser using AES-256-GCM (WebCrypto) with PBKDF2 key derivation and optional zlib/WASM compression. The server only ever stores ciphertext and metadata, never plaintext. Data flows from browser encryption into a pluggable persistence layer (filesystem, PDO database, Google Cloud Storage, S3), then back to the browser for decryption; JSON API endpoints accept and return encrypted bodies. Architecturally it is a classic server-rendered MVC app with a frontend state layer: index.php bootstraps a Controller, which delegates to Paste/Comment models over an AbstractData storage interface. Views are rendered via PHP templates with Bootstrap 3/5 themes, and the frontend is a vanilla-JS module namespace (PrivateBin) with submodules for encryption, editor, viewer, discussion, attachments, and i18n. The feature set includes expiration times, burn-after-reading, password-protected pastes, discussion threads, file attachments, URL shortening proxies (YOURLS/Shlink), QR codes, dark mode, and multi-language support. Engineering practices are strong for a mature open-source project: PHPUnit tests cover backend behavior, fast-check property tests cover frontend utilities, CI includes CodeQL/Snyk scans, and security hardening (DOMPurify, CSP, SRI hashes, HTTPS guidance) is explicit. Maintenance is active with recent commits and issue triage. Technical drift is moderate: the project retains legacy browser support and old Bootstrap 3/darkstrap assets, still supports PHP 7.4, and ships a monolithic JS file without a build step, but pinned frontend libraries (Bootstrap 5.3.8, Showdown 2.1.0, DOMPurify 3.4.17) are current.
Anytype for iOS is a full-featured, offline-first knowledge management and collaboration application. It provides a block-based editor for notes, documents, and databases (sets/collections), along with chat, spaces, widgets, and membership management. The architecture follows MVVM with a coordinator pattern, heavily leveraging SwiftUI for modern UI and UIKit for legacy editor components. Communication with the backend (middleware) is via protobuf-defined commands and events, with real-time subscription-based data synchronization. Dependency injection is handled through the Factory library, and the codebase is modular with separate packages for services, design system, core utilities, and generated protobuf models. The app supports iOS 17+ and uses Swift 6 concurrency features extensively.