Lertaro High-Performance Extensible Search for Windows. Index millions of local files in seconds. Lightweight, lightning fast, with a powerful alias and plugin ecosystem.
Lertaro is an ultra-lightweight, high-performance, extensible global search and productivity launcher for Windows, built on .NET 10 (WPF). It’s a modern, open-source alternative to Everything and Listary — indexing local drives via the NTFS USN Journal and MFT for near-instant, low-resource search.
Listary Alternative
A modern, beautiful, and highly extensible open-source alternative to commercial file search launchers.
Instant Indexing
Leverages the Windows USN Journal and MFT to read millions of files in seconds, lightweight and system-shared via a background service.
Instant Space Analysis
Explore indexed files in a modern treemap without rescanning disks, with live sizes, folder navigation, and the full actions menu.
Fuzzy Matching & Aliases
Type-ahead fuzzy matching with prefix/suffix/exact/exclude operators, plus pinyin aliasing for Chinese filenames — see it all in the User Manual.
Fully Customizable Hotkeys
Every hotkey — toggle window, next/previous item, actions menu, QuickLook preview — can be rebound to fit your workflow.
Extensible Plugins
Open SDK architecture allowing easy creation of custom search providers, aliases, context-menu actions, and UI extensions.
Process Isolation
A SYSTEM-level background indexing service is kept separate from the session-level user App UI, for maximum security and performance.
Highlights
- Millisecond indexing — reads the NTFS USN Journal/MFT directly instead of walking directories; a low-footprint background service keeps the index in sync in real time.
- FZF-style fuzzy search — multi-keyword fuzzy matching with prefix/suffix/exact/exclude operators, plus pinyin aliasing for Chinese filenames.
- Three ways to search — a quick popup window, a full main window, and an inline bar that docks directly into File Explorer or native file dialogs.
- QuickLook preview, a right-click-style actions menu, and hotkeys that are all rebindable.
- Open plugin SDK — extend search providers, aliases, context-menu actions, result columns, previews, and themes.
- Process isolation — a SYSTEM-level indexing service kept separate from the per-user app UI.
