Artifacts

Crunches 50,000 log lines either on the main thread or in a Web Worker, so you can feel the difference in UI blocking.

Side-by-side comparison and merging of text, code, Word, PowerPoint and PDF files, running offline, with extra text clean-up commands.

Boots a small Linux image through the v86 x86 emulator so you can run shell commands in a tab.

Renders Mermaid flowcharts and sequence diagrams as Unicode box-drawing text using a WebAssembly library.

Renders Mermaid flowchart and sequence diagrams as terminal-style Unicode box art in the browser.

Runs MicroPython in WebAssembly and stores the code in the URL so snippets are easy to share.

Executes ES5-style JavaScript in a small WebAssembly engine and keeps the code in the page address.

Removes comments from Python code using the real tokenizer on Pyodide, leaving strings and docstrings intact.

An interactive Python prompt running on Pyodide with several runtime versions and command history.

Runs JavaScript inside a QuickJS WebAssembly sandbox with a synchronous fetch helper and example snippets.

Runs the Redis AR* array commands against an in-memory instance compiled to WebAssembly.

Counts source lines by language from pasted code, a GitHub repo or a ZIP and estimates effort with COCOMO.

Parses SQLite SELECT queries into an abstract syntax tree shown as JSON and Python.

Shows the VDBE bytecode SQLite generates for a query, using EXPLAIN.

Runs SQLite in WebAssembly and shows query results in about twenty formats including boxes, CSV, JSON and Markdown.

Runs a query in browser-based Python SQLite and annotates EXPLAIN and query plan output in plain English.

Formats, parses, validates and tokenizes SQLite SQL in the browser using a compiled parser.

Analyzes SQLite queries with APSW running in an in-browser Python environment.

Displays a Bugzilla bug with its comments and history as a clean timeline.

Shows a Claude Code session .jsonl file as a searchable, filterable timeline.

Shows every format present on your clipboard after a paste, including text, HTML and images.

Opens a Codex rollout .jsonl file as a searchable, filterable timeline.

Builds an HTTP request from the browser and shows which response headers and body the page is actually allowed to read.

Adjust flex container and item properties with controls and watch the layout change live.