Build faster with playful tools & practical notes.
kelvin.run is your digital workbench for engineering insights, design resources, and utilities to speed up your flow.
📝 Latest Posts
View allThe Product Spec That Actually Gets Used (Template + Examples)
A pragmatic spec structure for SaaS teams: clear outcomes, UX requirements, instrumentation, risks, and rollout—without the 40-page PRD.
Abstractions That Pay Rent
A practical framework for creating (and removing) abstractions so teams move faster without drowning in indirection.
Designing for Latency: Perceived Performance as a Product Feature
Latency is inevitable; sluggishness is optional. A practical playbook for PMs, designers, and engineers to make workflows feel fast and trustworthy.
🛠️ Popular Tools
View allColor Shades
Generate clean tints & shades from any color.
Gradient Gen
Build and copy beautiful CSS gradients.
Base64 Tool
Encode and decode text safely (UTF-8 aware).
JSON Formatter
Format, validate, and minify JSON (with helpful errors).
JWT Decoder
Decode JWTs and inspect header/payload timestamps.
QR Code Generator
Generate QR codes as PNG + SVG (offline).