Observed arrival · 2026-09-21
Ironwood Chess Keeps Stockfish in the Browser
A private browser chess board that runs Stockfish 19 locally with its full NNUE evaluation network.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Chess players seeking private local analysis
- Worth noticing
- The complete 94.5 MiB Stockfish engine downloads once and is cached by the browser.
Field notes
The homepage separates engine calculation from board interaction, describing dedicated workers alongside Rust, egui, and WebGPU for rendering. It says the full engine occupies a 94.5 MiB one-time download that the browser caches, and identifies the current experience as a focused 2D game. A future animated battlefield is presented as a direction the architecture could support, not as a current feature.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue