About

What this is

A single home for everyday online tools and brain games. The goal is simple: open it, use it, no account and no pop-ups in the way.

There are 87 tools and 10 games across 12 categories, and every page is available in both Chinese and English.

How it works

Every tool is pure front-end JavaScript that computes inside your own browser. That means:

• What you paste is never uploaded — we have no server that could receive it;
• Most tools keep working with your network disconnected;
• There is no analytics script and no profiling.

Anything the tools produce (hashes, UUIDs, keys, random rolls) we cannot see and cannot recover. Close the tab and it is gone.

Where the tools come from

Some of the tool concepts are inspired by widely used open-source tool collections such as it-tools. To be clear:

• That project is licensed GPL-3.0;
• This site does not copy its source code — the implementations here are written from scratch against the general requirements;
• Therefore the GPL terms do not apply to this site, which is independently built.

The games follow common coordination-training formats (reaction speed, sequence memory, rhythm control), also independently implemented.

We do not sell data

There is no account system, and we collect no email, phone number, or any identifier. Game scores live in your browser's local storage and disappear when you clear site data.

About the ads

The site carries a small amount of advertising to cover domain and hosting costs. Ads are served by third-party networks:

• We do not control ad content and do not endorse it;
• Blocking ads with your browser's blocker removes them and breaks nothing;
• Every tool works fully with ads blocked.

If the ads get in your way, please let us know.

Contact

Found a calculation error, a broken game, or have an idea for a new tool? Write to hello@funtoolkit.com.