Skip to content
100% in your browser. Nothing you paste is uploaded — all processing runs locally. Read more →

Tools that load instantly.

No popups, no signup walls, no laggy SPAs. Each tool is a tiny static page on its own subdomain — bookmark the one you use. 62 tools, 100% client-side — your data stays in your browser. Browse all →

Developer tools

Encode, decode, validate, generate. Built for the address bar.

Utilities

Date, time, color — the things you Google five times a week.

Finance

Plain-English calculators with shareable scenarios. No email gate.

Fitness + cardio

Pace, splits, race prediction, erg watts. Honest math.

From the blog network

Long-form posts on the practical problems each tool exists to solve.

Why the network exists

Most online dev / utility tools are 5 MB SPAs that take 3 seconds to show a text input, plus an email gate, plus an upsell. We're building the opposite: each tool is a static page under 30 KB with no signup, no upload, no laggy framework. Pages render instantly and run entirely in your browser.

Each subdomain is independently deployable; a single shared Caddy on the VPS routes by Host header. Press ⌘K (or /) on any page for the cross-network command palette — it auto-detects what you've pasted (UUID, JWT, JSON, color, timestamp, hash) and jumps to the right tool.

What's coming

Category hubs are live at dev.tooljo.com and money.tooljo.com, with convert.tooljo.com next. Tools on the roadmap: unit (universal converter), timezone (DST-aware ranges), and currency (daily static rates). The general rule: each new tool goes live the day it ships rather than waiting for a "launch."

Want one we don't have yet? Request a tool → — every email goes to the founder.