A plain text editor for the desktop and terminal, written in Rust. Speed and a quiet, responsive interface come first.

Early beta: 0.1.0-beta.5 is published as a prerelease. The full v1 specification is still in progress. See beta status and release notes before evaluating it with copies of important files.

Features

• Desktop and terminal interfaces: use the native GUI or the keyboard-driven TUI from the same application. Force either with --gui or --tui.
• Everyday file editing: tabs, new/open/save/save as/save all, recent files, reopening closed tabs, undo/redo and recovery journals.
• Editing tools: multiple cursors, rectangular selection, indentation, comment toggling, line operations, go to line, whitespace display and word wrap.
• Search and navigation: in-file find/replace, case and whole-word options, regex support, folder search, a command palette and fuzzy file navigation. Search completeness and folder replacement remain beta limitations.
• Configurable controls: VS Code, Notepad++ and Vim keymap presets, custom bindings and TOML settings, with settings interfaces in both frontends.
• Text encodings: UTF-8, UTF-16 LE/BE, UTF-32 LE/BE and supported stateless legacy encodings, including Shift_JIS, EUC-JP, GBK, Big5 and Windows-1252. Untouched encoded bytes and malformed-byte provenance are preserved by the shared text/save engine. Per-file pickers reopen clean files or select the next save encoding, and convert LF / CRLF line endings.
• Hex editing: inspect physical bytes and edit in hex, with an explicit text/hex choice for binary input.
• Syntax highlighting: bundled language support and a generic fallback for other text, with background highlighting work.
• Markdown preview in the GUI: text, preview and split modes, including supported local images. Rendered preview is limited to 256 KiB of logical source.
• Rendering designed for remote desktops: event-driven updates, a CPU renderer and remote-mode controls. Cross-platform damage and remote bandwidth budgets still need qualification.

These describe implemented areas to try, not a promise of complete GUI/TUI parity or acceptance of every v1 requirement. Compare views, formatter execution, log following, custom themes and accessibility remain incomplete. Any-size opening, resident index memory limits, full allocation admission and published performance budgets are also unfinished. ISO-2022-JP is explicitly unsupported.

Try it

Download from Releases, for x64 or ARM64:

• Windows: run kwil-<version>-windows-<arch>-setup.exe (per user, no admin rights; Start menu entry and uninstaller), or extract the .zip and keep kwil.exe and kwil.com together.
• macOS / Linux: extract kwil-<version>-<platform>.tar.gz.

Packages arrive from beta.3 on; beta.2 ships bare executables (rename the Windows pair to kwil.exe and kwil.com). Then:

.\kwil.exe notes.txt
.\kwil.com --tui notes.txt

On macOS or Linux:

./kwil notes.txt
./kwil --tui notes.txt

Builds are unsigned, so SmartScreen and Gatekeeper warn on first start. Kwil updates itself: beta builds follow betas, stable builds follow stable releases (updates). See the installation guide.

To build from source, use scripts/run.bat on Windows or scripts/run.sh elsewhere. Add --release for an optimized build or --tui for terminal mode.

Screenshots

Actual beta TUI sessions captured through a hidden Windows ConPTY and rendered from recorded terminal output, at 120 × 32 cells. See the capture method and limits.

Historical Windows GUI captures from 24 October 2026 use a development build with the frame harness enabled. The gallery and provenance identify their source and capture limits; they are not beta artifact verification.

Project

• Beta status and checks
• v1 specification and performance targets
• Architecture decisions
• Report an issue

License: MIT.