Features

Features

Board editor

• Drag-and-drop board editor built on @dnd-kit with pointer and touch sensor support.
• FEN input with real-time validation. Input is hard-capped at 93 characters before any parse attempt.
• Board flip and coordinate label toggle.
• Border frame toggle.

Export

• PNG, JPEG, and SVG export.
• Four quality presets: 1× (300 DPI), 2× (600 DPI), 3× (900 DPI), 4× (1200 DPI).
• Board size in centimetres (4 cm, 6 cm, 8 cm) for print-accurate output.
• Pixel dimensions are computed as: round((boardSizeCm / 2.54) × 300 × multiplier).
• Batch export across multiple positions, downloaded as a ZIP.
• Export pause, resume, and cancel.
• DPI metadata embedded in PNG (pHYs chunk) and JPEG (JFIF density fields).
• Heavy raster work runs in a Web Worker, off the main thread.
• Safari canvas memory is protected by explicit canvas.width = 0 disposal after every blob.

Board customisation

• 20 piece sets loaded from Lichess CDN.
• 20 preset board themes.
• Custom colour picker with HSV, RGB, and HEX inputs.
• Up to 48 saved theme presets including user-created ones.
• Swipe gesture navigation between piece set pages.

Advanced FEN page

• Batch FEN input — up to 10 positions simultaneously.
• Playback controls with configurable interval.
• Per-position export with preview.

Position history

• FEN history with favourites, pinning, and full-text search.
• Freshness indicators: Fresh, Aging, Stale — with timestamps.
• Filter by date range.
• Batch FEN list with localStorage persistence.
• Clipboard history panel.

Database search

• Search the current position across Lichess, ChessDB, PDB, and YACPDB simultaneously from the board editor.
• Results link directly to each database's page for the position.

Account and cloud sync (optional)

• Email/password authentication with TOTP-based two-factor authentication.
• Cloud sync via Supabase — settings and history synced across devices.
• Row-level security: each user can only access their own data.
• 90-day re-verification gate for sensitive operations.
• Data migration from localStorage on first sign-in.

Pages

Path	Page
/	Board editor
/export	Export settings and controls
/advanced-fen	Batch FEN editor with playback
/fen-history	Position history
/about	About and changelog
/settings	Board style, accessibility, account, data management
/auth/sign-in	Sign in
/auth/sign-up	Create account
/auth/forgot-password	Password reset
*	404

Browser support

Browser	Minimum version
Chrome	90+
Firefox	88+
Safari	14+
Edge	90+

Required APIs: Canvas API, Web Workers, localStorage, ES2020+. Clipboard API is optional — copy-to-clipboard falls back gracefully when unavailable.