If you have used Slack on Windows or Linux (and even macOS today), you are using an Electron application. But the journey to get there was not just about following a trend—it was a fundamental architectural rewrite that saved the product from crumbling under its own weight.
In 2024–2025, Slack began migrating certain UI components to a custom Rust-based rendering layer ("Slack Native Shell") to reduce Electron's memory footprint. However, the stable public app remains Electron-based for the vast majority of users as of 2026. Always check Slack’s official changelog for the most current architecture. slack desktop electron
| Feature | Implementation | |--------|----------------| | | Electron’s sandbox option enabled – renderer processes run with limited privileges | | Enterprise proxy support | Respects system proxy settings (PAC, manual) via Chromium networking stack | | SSO login | Embedded Chromium login popup handles OAuth/SAML redirects | | Data encryption at rest | Local cache encrypted via OS keychain (macOS Keychain, Windows Credential Manager) | | SCIM & EKM | External Key Management – decrypts messages only in memory | If you have used Slack on Windows or
By using Electron, Slack can maintain a single codebase for all its desktop versions, ensuring that every user gets the same features and updates simultaneously. The Evolution of Slack on Desktop However, the stable public app remains Electron-based for
Slack was one of the earliest high-profile apps to prove that Electron (a framework for building desktop apps with web technologies) could work for mainstream, complex applications. While Slack has since moved to a more optimized custom solution for some parts (Slack’s "Softwear" rewrite), the current stable version as of 2026 still operates on an Electron-based architecture.