byte4day · AI engineer and founder

Numan Hayder

I build agent skills, developer tools and Linux desktop software. Most of it starts as a tool I needed myself.

Right now I'm shipping Modu on Discord, Slack and WhatsApp. The latest release is Product Video v0.1.0, out 1 November 2026.

Enter the 3D roomDownload CVGitHub (opens in a new tab)LinkedIn (opens in a new tab)

Work

Copycat

Lets a coding agent rebuild a UI it can see, then diff the result against the original.

Reference: a pricing page with Starter, Team and Firm plans.
First rebuild: the heading is smaller, the Starter card has less top padding and the Firm plan is missing Audit trail.
  1. 1structureMissing list item "Audit trail"
  2. 2typographyHeading "Pricing" is 28px, reference is 32px
  3. 3spacingCard padding-top is 16px, reference is 24px
A fictional pricing page from Copycat's test fixtures. The first pass is recreated from the logged differences.

An open-source agent skill and browser toolkit. Point it at a live page, a local build or a screenshot. Playwright measures the reference: tokens, layout, responsive states and what each control really does. The agent rebuilds it in your stack, then a pixel and structural diff lists what still differs, most important first.

Node.js, Playwright and pixelmatch. Runs in Claude Code, Codex, Cursor and Antigravity. MIT licensed.

$ copycat compare --reference … --local …
desktop: 3.72% pixels differ, 44/45 elements matched
  1. [structure] Missing listitem "Audit trail"
  [typography] heading "Pricing": 32px → 28px
  [spacing] section: paddingTop 24px → 16px
$ # fix, run again
iteration 2 · desktop: 0.00% pixels differ
How it works
  1. Plan. Pick one scope: a component, page, flow, full site, screenshot, tokens, an audit or a compare.
  2. Inspect. Open the reference in real Chromium at each viewport and record screenshots, DOM, computed styles and breakpoints.
  3. Probe. Click menus, tabs and dialogs safely and record what actually changes.
  4. Build. The agent rebuilds the scope in your stack, with working controls.
  5. Compare. Run a pixel and structural diff with unstable pixels masked, and rank the fixes.
  6. Report. Only measured facts. Mocks and guesses are labelled as such.

Source on GitHub (opens in a new tab)

Modu

One AI operator for Discord servers, Slack workspaces and WhatsApp numbers.

How a request goes: plan, risk, your approval, then the change. An illustration of the flow, not a screenshot.

You ask for a change in plain language. Modu plans it, shows the risk of each step, waits for your OK, applies it and keeps an undo. I build it at UBITS Technologies.

Next.js, TypeScript, Postgres and LLM agents. Live on Discord, Slack and WhatsApp.

Discord

  • Channels, roles and permissions from chat
  • Automod, anti-raid, tickets and leveling
  • Daily backups and weekly health reports

Slack

  • Help desk with response targets
  • /modu incident opens a channel, pages on-call, drafts the post-mortem
  • Async standups, polls and automations

WhatsApp

  • Shop assistant that quotes your real prices
  • Bookings, reminders and payment links
  • Shared team inbox and voice-note transcripts

Open modu.ubits.tech (opens in a new tab)Source is private

Lost Island for Sway

A pure-black dynamic island for the Sway desktop.

Opening the island, pausing playback and closing it again. Recorded on my desktop, 11 October 2026.

My Linux build of Marco Zorn's Lost Island. The idle pill shows the Arch mark and the clock. Opened, it holds a player tinted by the album art, round switches for Wi-Fi, Bluetooth and audio, a focus timer, screen recording, and launchers for Claude Code, Codex and Cursor Agent. Media keys drive any MPRIS player. There is also a Windows port.

Python, GTK4 and gtk4-layer-shell on Wayland. MIT licensed.

Based on Lost Island v1.7.2 (opens in a new tab) by Marco Zorn, MIT. The original attribution is kept.

Controls and requirements
Switches
Wi-Fi, Bluetooth, sound and mic. Blue means on; right-click opens the settings.
Tools
Focus mode, screen and area shots, color picker, recording and AirPlay.
Clipboard
The last 25 copies, kept in memory only and never written to disk.
Power
Lock, log out, sleep, restart and shut down. The risky ones need a second click.
Pill
Scroll for volume, middle-click to play or pause, swipe to change the face.
Requires
Sway on Wayland, Python 3.11+, GTK4 with libadwaita, gtk4-layer-shell, wf-recorder, hyprpicker and UxPlay for AirPlay.
The collapsed pill: the Arch mark and the clock.
Idle
The expanded card in pure black: a player showing Yaseen by Mishary Alafasi, two rows of round controls with sound and mic on in blue, a volume bar, launchers for Claude, Codex and Cursor, and a 25-minute focus timer.
Open, playing

Source on GitHub (opens in a new tab)

More projects

  • Product VideoTurns a product or game brief into a researched promo film inside Claude Code.Agent skill

    A Claude Code plugin with skills and specialist agents. It researches official sites, stores and press into disk artifacts, storyboards with a human gate, builds a Remotion or Three.js film, then runs automated QA plus a fresh-eyes review before a READY gate and the MP4.

    Claude Code plugin, Remotion and Three.js, Node scripts. MIT licensed.

    Commands
    /video, /video-research, /video-storyboard, /video-render, /video-qa.
    Agents
    Researcher, feed scout, cinematographer, renderer and independent QA reviewer.
    Install
    claude plugin marketplace add byte4day/claude-video-skill && claude plugin install product-video@product-video

    Source on GitHub (opens in a new tab)

  • Lost Island for WindowsA dynamic island for Windows 10 and 11.Windows desktop

    A from-scratch port of Lost Island for Sway. A spring-animated black pill sits at the top of the screen, as an island or a notch. It shows live activities: Claude Code status and permission requests, now playing with album art, downloads and a focus timer. Opened, it holds a player, round switches, volume and brightness sliders, and launchers for Claude, Codex and Cursor.

    C++20 with Win32, Direct2D, DirectWrite and WinRT. One static .exe of about 1.4 MB, nothing to install.

    Peeks
    Volume, Caps Lock, charger and track change.
    Edit mode
    Press and hold the card, then add, remove or drag controls.
    Settings
    A control panel in the style of macOS System Settings, with eight pages and the macOS accent colors.
    Open
    Tray icon or Ctrl+Alt+I.
    Download
    LostIsland-1.0.1-win64.zip on the latest release.
    The open card: a player showing Midnight City, a Claude Code permission request asking to allow Bash, two rows of round controls with sound and mic on in blue, a volume slider, launchers for Claude, Codex and Cursor, and a line with a 25-minute timer, weather and battery.
    The open card, rendered.

    Source on GitHub (opens in a new tab)

  • confession.babyAnonymous, moderated confessions for Pakistani campuses.Web app

    A live community site and Android app. Students post anonymously to their campus page; a word filter and human review keep it clean, and comments publish instantly. Members sign in with six words instead of an email and password, and get Web Push alerts I implemented from the RFC.

    Astro and Hono on Cloudflare Workers, with D1 and R2. Capacitor for Android. 78 Playwright end-to-end tests.

    Campuses
    Pages for 10 universities, including NUST, LUMS, FAST and GIKI.
    Sign-in
    Six words, like a crypto wallet. No email, no password.
    Features
    Profiles with an ask box, photo battles, polls, badges and a short-name drop.

    Open confession.baby (opens in a new tab)Source is private

  • DevOps AgentLets a coding agent deploy, debug and roll back an app, and prove it is healthy.Agent skill

    An agent skill with a real Python CLI behind it. It inspects the machine, cloud identity and project, forms a deploy plan, runs supported provider deploys, classifies CI and build failures, then checks DNS, TLS, HTTP and security headers on the live URL. Production rollback needs explicit approval.

    Python 3.11+, tested with pytest and ruff. Runs in Claude Code, Codex, Cursor and Antigravity. MIT licensed.

    Stages
    Discover, understand, plan and deploy, investigate, verify, recover.
    Repairs
    A three-attempt budget with a guard against retrying an unchanged fix.
    v0.2.0
    devops-agent relay hands sub-tasks to other agent harnesses.

    Source on GitHub (opens in a new tab)

  • nummodeReads a long prompt, picks the agent skills it needs, then runs and checks the work.Agent skill

    A routing layer for agent harnesses. Version 2 ships route.py: it detects the mission in a brief, ranks every installed skill and locks one to seven of them. Then it executes and verifies with real commands, without asking which skills to use.

    Python and shell. Works in Claude Code, Cursor, Codex and Antigravity.

    Stages
    Intake, mission, route, invoke, execute, verify.
    Scoring
    A skill gains points when its description overlaps the prompt, when the mission's playbook lists it and when the stack matches. Weak or duplicate matches lose points. Skills scoring 3 or more are kept.
    nummode · build · skills: writing-plans, frontend-design,
        verification-before-completion

    Source on GitHub (opens in a new tab)

  • QuranFlowQur'an recitation in the background while you code.CLI

    A small Linux CLI that streams a chosen Surah and reciter through mpv. It works the same from a terminal, Claude Code, Cursor or Codex, and an agent call costs one command and one line of output.

    Python 3.11+ and mpv on Linux. 114 Surahs. No telemetry.

    $ play-quran al-kahf --reciter dosari
$ play-quran pause

# from an agent, one line back:
playing · 036 Yaseen · Mishary Alafasi · vol 65
    A 30-second teaser. Sound design only, no recitation.

    Source on GitHub (opens in a new tab)

  • AI UsageShows Cursor, Claude and Codex usage limits, read from files already on disk.Desktop widget

    A GNOME Shell extension and a native Windows widget. It reuses the credentials each CLI already stored, so there is no separate sign-in.

    JavaScript for GNOME Shell 46–50, C++ and Win32 for Windows. MIT licensed.

    Reads
    ~/.config/cursor/auth.json, ~/.claude/.credentials.json and ~/.codex/auth.json.
    Warnings
    The ring turns amber past 75% of a limit and red past 90%.
    Tokens
    Expired Claude tokens are renewed with the saved refresh token and written back, so the CLI stays signed in.

    Source on GitHub (opens in a new tab)

  • PxForgeTurns a codebase into one Markdown file an LLM can read.Terminal app

    Walks a project, analyzes every file with an LLM and writes one document: summary, directory tree, per-file notes and a system prompt tailored to that code. Paste it once into Claude, ChatGPT, Gemini or Cursor.

    Python with a Textual interface. Linux, macOS and Windows. MIT licensed.

    Providers
    OpenAI, Anthropic, Groq, OpenRouter and local Ollama models.
    Large files
    Chunked, analyzed in parts, then merged into one summary.
    PxForge settings screen in the terminal: provider set to Anthropic, a model picker, Fast or High Quality mode, and the preferred AI for viewing output.
    The settings screen.

    Source on GitHub (opens in a new tab)

  • AyahPathQur'anic verses for the situation you are in.Web app

    Built for the Quran Hackathon. Pick a situation such as stress, anger or patience and read related verses with translation, tafsir, recitation audio and connected hadith. Journaling and prayer tracking stay on the device.

    Python, Flask, SQLite and plain JavaScript. Works offline as a PWA.

    Translations
    Urdu, English, French, Indonesian, Bengali, Turkish and Hindi.
    Accessibility
    Modes for protanopia, deuteranopia and tritanopia, high contrast and adjustable text size.
    AyahPath home screen showing the ayah for today, Al-Anfal 8:2, in Arabic with an English translation, a streak counter and a list of life situations.
    Home, with the ayah for today.

    Source on GitHub (opens in a new tab)

Smaller repositories

Every public repository (opens in a new tab)

Ship log

Only things that shipped, newest first.

November 2026

  1. Product Video v0.1.0

    • Claude Code plugin: research → storyboard → Remotion/Three → READY gate → MP4
    • Public at github.com/byte4day/claude-video-skill

October 2026

  1. confession.baby: the short name drop

    • One-to-three character usernames, one per account
    • Countdown page, live names-left counter and a shareable member card

  2. DevOps Agent v0.2.0

    • devops-agent relay: hand sub-tasks to other agent harnesses
    • Same install for Claude Code, Codex, Cursor and Antigravity

  3. confession.baby: photo battles and push alerts

    • Head-to-head photo battles with one vote per visitor
    • Web Push written from RFC 8291, no third-party service

  4. Lost Island for Windows v1.0.0

    • Native C++20 port: one 1.4 MB .exe, no runtime
    • Live activities for Claude Code, media, downloads and a focus timer
    • Control panel with eight pages, tray icon and Ctrl+Alt+I

  5. Copycat v0.1.0: open source

    • One skill for Claude Code, Codex, Cursor and Antigravity
    • Inspect, probe states, rebuild, then pixel + structural diff
    • 77 tests, 22 of them in a real browser

  6. confession.baby goes live

    • Anonymous, moderated confessions with campus pages
    • Astro and Hono on Cloudflare Workers, D1 and R2

    nummode v2.0.0: the router

    • route.py detects the mission and ranks every installed skill
    • Slot tables per mission in the playbooks

    QuranFlow for Claude Code

    • One-call --brief mode: one command, one output line
    • 30-second teaser

    Lost Island redesign

    • Pure black card, round switch grid, art-tinted player
    • Clipboard history, color picker, power menu
    • New screenshots and an 11-second demo

    Modu: help desk, incidents, bookings

    • Slack: response targets and /modu incident
    • WhatsApp: bookings, payment links, shared inbox

  7. Automations on Slack and WhatsApp

    • When-this-then-that rules on messages, joins and reactions
    • Member suggestions with voting

  8. Modu for Slack and WhatsApp go live

    • slack.ubits.tech and whatsapp.ubits.tech
    • Same assistant and approvals as Discord

About

I'm Numan, byte4day on GitHub. I work across developer tooling, applied AI, full-stack web apps, Linux desktop systems, automation and security.

Most of what is on this page started as a tool I needed myself, then got cleaned up and published. Modu is the exception: I build it at UBITS Technologies, and its source is private.

What I reach for

  • TypeScript and Next.js for products and consoles, in Modu and this site.
  • Python for CLIs, desktop apps and tooling, in nummode, QuranFlow, PxForge, Lost Island and AyahPath.
  • JavaScript for browser tooling, GNOME Shell and bots, in Copycat, AI Usage and NezoPer.
  • C++ and Win32 for a native Windows widget, in AI Usage.
  • GTK4, Textual and Tkinter for desktop and terminal interfaces, in Lost Island, PxForge and WhiteBoard.
  • Postgres and SQLite for product data, in Modu and AyahPath.