Zerethon
Zerethon

Zerethon

Useful software for developers, schools and everyday work

Five live products on one account: Flow shows where your Laravel app spends its time, Tools gives you 180 free browser utilities, Smart Edu runs lessons and online exams for schools, Games offers 27 free browser games, and Social is a calmer place to keep in touch.

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Live today

What you can use on Zerethon

Each product is a separate site and works on its own. All are free; each overview lists what it does today and what it can't do yet.

flow.zerethon.com

Flow

See what your application actually does at runtime.

  • Runtime request traces
  • Deterministic bottleneck detection
  • Offline and Connected modes
Open Flow Overview

tools.zerethon.com

Zerethon Tools

180 free utilities for developers, creators and learners.

  • Developer utilities (73)
  • Security and hashing
  • Algorithm visualisers (31)
Open Zerethon Tools Overview

edu.zerethon.com

Smart Edu

Lessons, question banks and online exams for schools, teachers and students.

  • Organisations and roles
  • Question bank with imports
  • Lessons
Open Smart Edu Overview

game.zerethon.com

Zerethon Games

27 free browser games — puzzles, arcade and learning games.

  • Puzzle games
  • Learning games
  • Real-time two-player
Open Zerethon Games Overview

social.zerethon.com

Zerethon Social

A calmer social space built around people you actually know.

  • Feed and profiles
  • Friends, groups and pages
  • Real-time chat and notifications
Open Zerethon Social Overview
One account, separate products Sign in once for all of them. Only your identity is shared — each product keeps its own data. How it works →

Knowledge

What we've learned building these

Practical articles on engineering, web development, security, privacy and education technology — written from the work behind the products.

All articles
Engineering Finding the Real Bottleneck in a Laravel Request Why guessing at slow requests wastes time, how a runtime trace splits a request into measurable steps, and how to read the result to decide what to optimise. Read article
Engineering Runtime Analysis vs Static Analysis: What Each Can Tell You Static analysis reads code; runtime analysis watches it run. What each one is good at, the blind spots of both, and how to combine them. Read article
Web Development How a Request Flows Through a Laravel Application From public/index.php to the response: the HTTP kernel, middleware, routing, controllers, the service container and the database — and where time is usually spent. Read article
Web Development URL Encoding Explained: encodeURI vs encodeURIComponent Why URLs need percent-encoding, which characters are reserved, the difference between encoding a whole URL and a single parameter, and the "+" vs "%20" trap. Read article
Web Development JSON Syntax Errors: The Common Ones and How to Fix Them Trailing commas, single quotes, comments, unquoted keys, NaN and big numbers — why JSON rejects them, how to read the parser's error, and when JSON5 is the better fit. Read article
Tools Guides UUID v4 vs UUID v7: Which Should You Use? How random v4 and time-ordered v7 UUIDs are built, why v7 is friendlier to database indexes, what each leaks, and how to choose. Read article

How we build

What you can expect from every product

Useful first

Every feature has to solve a real task — no sign-up walls in front of ten-second jobs, no feeds built to keep you scrolling.

Private by default

Where a task can run in your browser, it does. Products share your account, never your data.

Honest about limits

We describe what exists today. Every product page lists what it can't do yet.

Why Zerethon exists

FAQ

Common questions

All questions

What is Zerethon?

Zerethon is a small team that builds five web products: Flow (runtime traces and website scans for developers), Zerethon Tools (180 free browser utilities), Smart Edu (lessons, question banks and online exams for schools), Zerethon Games (27 free browser games) and Zerethon Social (a social network built around people you know). They share one account system.

Is it free?

Yes. All five products are free to use. Some public pages on zerethon.com show advertising through Google AdSense, which helps cover running costs.

Do I need an account?

Not for Zerethon Tools or single-player games. Flow's dashboard, Smart Edu and Social need a Zerethon account, and one account works for all of them — you sign in once at auth.zerethon.com.

Do the products share my data?

Only your identity (the account you sign in with). Each product keeps its own data in its own database, so your Smart Edu classes are not visible in Social and your Flow projects are not visible anywhere else.

Does Zerethon Tools send what I paste to a server?

Tools that only transform text — formatting, encoding, hashing, generating UUIDs, AES encryption — run entirely in your browser, so the input is not sent to Zerethon. A few tools, such as an Open Graph preview that must fetch a remote URL, need a server by nature.

Zerethon is not a financial, investment or trading platform. Achievements, points and badges in our products have no monetary value. Some public pages on zerethon.com show advertising via Google AdSense — see the privacy policy.