Tools 13 sites

The daily-use utility belt.

freemium

regex101

PCRE2/JS/Python/Go/Java/.NET. Savable library with account. Privacy caveat: keystrokes sent server-side.

regex101.com
freemium

JSONCrack

Free web version; Premium $6/mo. Modular architecture in v5.

jsoncrack.com
free

diagrams.net / draw.io

No Enterprise gating. Browser + desktop, no signup. Go-to for architecture sketches, C4.

app.diagrams.net
free

CyberChef

Open source, browser-only, data never leaves your machine.

gchq.github.io/CyberChef
free

transform.tools

JSON to TS/GraphQL/Zod/Go, SVG to JSX, HTML to Pug. Indispensable for one-off schema conversions.

transform.tools
freemium

Excalidraw

Free core enough for most work. Excalidraw+ optional cloud persistence.

excalidraw.com
freemium

tldraw

Free canvas; SDK paid for commercial multiplayer embed.

tldraw.com
free

Compiler Explorer

Community-supported. Indispensable for perf-critical code work.

godbolt.org
free

caniuse

Authoritative baseline for feature-detection decisions. Feeds shields.io, PostCSS.

caniuse.com
free

bundlephobia

Still the standard pre-install check. Maintenance-mode-ish.

bundlephobia.com
free Stack pick

pkg.pr.new

StackBlitz-Labs maintained. Standard for library authors now.

pkg.pr.new
free

Ray.so

17 themes, 50+ languages, PNG. Prefer over Carbon (dormant since Dec 2024).

ray.so
free

ShareX

80+ upload destinations. Best-in-class Windows tool for our corp-laptop context.

getsharex.com