FlashCap

A macOS screenshot capture & annotation app.

Features

• Screenshot capture (interactive area selection)
• Timer capture (configurable delay: 3/5/10 seconds)
• Arrow annotation tool (color, thickness, white stroke, drop shadow)
• Mask tool (mosaic, blur, fill) with resize/move handles
• Clipboard integration (copy path or image)
• Drag & drop to external apps (e.g. Slack)
• Configurable save location (tmp / macOS default / custom folder)
• Keyboard shortcuts (ESC to quit, Delete to remove selected annotation)
• Preferences window (save location, timer delay)

Tech Stack

• Frontend: SvelteKit 2, Svelte 5, TypeScript
• Backend: Rust (Tauri 2.x)
• Build: Vite, pnpm

Prerequisites

• Rust (stable)
• Node.js
• pnpm
• macOS

Development

pnpm install
pnpm tauri dev

Build

pnpm tauri build

Type Check

pnpm check

Project Structure

src/                          # SvelteKit frontend
  routes/
    +page.svelte              # Main capture UI
    preferences/+page.svelte  # Preferences page
  lib/
    ArrowOverlay.svelte       # Arrow annotation overlay
    MaskOverlay.svelte        # Mask (mosaic/blur/fill) overlay
    types.ts                  # Shared types
src-tauri/                    # Rust backend (Tauri)
  src/lib.rs                  # Tauri commands & app setup

Note for AI Assistants

SvelteKit 2 (with Svelte 5 runes) and Tauri 2.x are relatively new frameworks. When working on this project, use context7 MCP to look up the latest API documentation.