A desktop app for managing, versioning, and composing LLM prompt templates.
Promptcase stores prompts as Markdown files with YAML frontmatter, giving you full control over metadata, version history, and template composition. It runs as a native desktop app powered by Tauri v2, with a Svelte 5 frontend and a Rust backend for git operations, token counting, and search.
- YAML frontmatter metadata -- tags, variables, model targets, and custom fields on every prompt file
- Template composition -- include reusable fragments with
{{> fragment-name}}syntax - Variable substitution --
{{variable}}placeholders with enum value support - Git-backed version history -- view diffs, browse history, and restore previous versions
- Token counting -- estimates for multiple models (Claude, GPT-4o)
- Template linting -- real-time error and warning display as you edit
- Full-text search -- search across all prompts and fragments
- Code editor -- dark theme editor powered by CodeMirror 6 with Markdown and YAML support
- Context menus -- right-click to rename, duplicate, or delete prompts
- Command palette -- quick actions via Cmd+Shift+P, quick open via Cmd+P
| Layer | Technology |
|---|---|
| Frontend | Svelte 5, TypeScript, Vite, CodeMirror 6 |
| Backend | Rust / Tauri v2 (git2, serde_yaml, tiktoken-rs, built-in search) |
| Desktop | Tauri v2 (Rust) |
- Node.js 20+
- Rust (latest stable)
- Tauri CLI (
npm install -g @tauri-apps/cli)
git clone https://github.com/promptcase/promptcase
cd promptcase
npm installRun the full desktop app with Tauri:
npm run tauri devRun tests:
npm test # Frontend tests (Vitest)
cargo test --manifest-path src-tauri/Cargo.toml # Backend tests (Rust)Package the desktop app:
npm run tauri buildThe compiled application will be in src-tauri/target/release/.
GPL-3.0-only. See LICENSE for details.