Things I built and put on the internet for free.

Bar-by-bar replay of any Binance perp, with full paper trading — limit/stop/TP/SL, leverage up to 125×, isolated margin, liquidations. Free, in-browser, no signup. Built because every existing replay tool is paywalled.

Type markdown on the left, see it rendered on the right, export to a clean PDF when you're done. GFM tables, task lists, syntax-highlighted code. Drafts persist locally. No signup.

25 minutes of focus, 5 minute break, repeat. Big circular timer that changes color per mode, a chime when time's up, and a todo list that tracks how many pomodoros each task ate. Stays accurate even with the tab in the background.

Pings any URL from your browser, drops the cold-start sample, and tells you whether you're colocated, near, or too far for HF / momentum trading. No backend, no proxy — what you measure is what your bot would get from this device.

Paper trade live Binance perps with real-time WebSocket data — 1m to 4h candles, full order types, leverage, liquidations. Trades auto-log to a journal with analytics: win rate, expectancy, profit factor, equity curve, calendar heatmap, hourly/daily breakdown, per-pair and per-setup stats. No signup.