OldBig's Dev Notes & Toolbox

Welcome to this digital garden. Here I share hard-won development lessons and the privacy-first browser tools I built to solve my daily problems. Everything here runs 100% locally on your device—no tracking, no sign-up, no data upload, no servers.

100% Local Processing-Zero Data Sent-Free Forever

Free Tools

Browser-based utilities I actually use in my own workflow.

Bluesky Composer

Split long posts into properly-numbered threads for Bluesky and Threads

Strip GPS coordinates and camera metadata from photos before sharing

Protobuf Visualizer

Decode Protobuf binary and JWT tokens without a schema file

Version your AI prompts and compare outputs side by side

Check if your colors pass WCAG AA/AAA and simulate color blindness

See at a glance where your global team's working hours overlap

Notion Progress

Generate SVG progress bar images for Notion databases

Estimate the CO2 emissions from your AI API calls and training runs

Create WiFi, URL, and text QR codes—100% offline after page loads

Preview how your links look on Twitter, Facebook, and LinkedIn