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Developer tools

Small utilities for the work around the work. Every tool runs entirely in your browser — offline, private, instant.

1 of 7 tools live today — the rest ship in later phases.

Live now

JSON Formatter

Pretty-print, minify and validate JSON with precise error positions.

1 planned

Markdown Previewer

Write Markdown on the left and see the rendered result on the right.

2 planned

Regex Tester

Test regular expressions against sample text with live match highlighting.

Color Contrast Checker

Check foreground and background color pairs against WCAG contrast thresholds.

3 planned

Base64 Encoder

Encode and decode Base64 text for data URLs and basic payloads.

UUID Generator

Generate random UUIDs (v4) one at a time or in batches.

Epoch Converter

Convert between Unix epoch seconds and human-readable dates.