newOS4 v4.2

WebX11 Terminal · In-Browser Terminal OS · Reviewed 2026-06-01

Module Files

25+17

Core + Ext

Skills

Theme Presets

52KB

App Size

4/5

Rating

Architecture

newOS4 v4.2 is an in-browser terminal OS — NOT a chat-centric UI. Single-file main.html (1,031 lines, 52KB) loads 42 module files across two directories:

25 core modules (modules/core/) — Foundation infrastructure (VirtualFileSystem, OllamaManager, SecretVault, ModuleManager, Terminal) + 19 built-in feature modules (system, fs, modmgr, ollama, my, searxng, servermon, ollamamodels, config, simplegui, io, dynamicprompts, aiassist, aiasm, smartctx, duckduckgo, fetcher, skills, chatstudio)
17 ext modules (modules/ext/) — Self-registering: alias, busybox, calc, cron, cryptogzip, diff, editor, filemgr, finder, mindmap, shell, skill-pack-core, theme, tutorial, voice, webdav, wpm

Total codebase: ~800KB (main.html + all module files). AI system with 5-turn agentic loop, 19+ tool definitions, 17 skills in VFS, 9 theme presets, and full destructive-action confirmation.

Key Features

🧠 AI Assistant (WebX11AIAssistantModule)

Agentic loop with 5 tool-call turns, 19+ tool definitions
Date/time injection into system prompt for contextual awareness
Streaming NDJSON response parsing with real-time token display
Auto-loads relevant skills at start of every AI task
Inline destructive action confirmation with 120-second countdown timer
Status bar "🤖 AI Thinking..." spinner with pulse animation
Post-task reflection suggesting skill creation
ai-stop escape-cancel, ai-model runtime model switching

📁 Virtual File System

localStorage-backed in-memory filesystem with persistent state
19 Unix commands: ls (flags), cd, pwd, cat, echo (> redirect), put, rm/rmdir/mkdir/mv/cp/touch/tree/find/head/tail/sort/wc/du/upload/download/grep
Trash system: rm moves to trash, ls-trash, empty-trash, trash-dir, rm -rf for real deletion
VFS Checkpoints: snapshot/rollback via checkpoint and rollback commands, auto-prune at 10
Auto-save session system: 60s interval with dirty-flag skip, context persists through reloads

🎨 Theme System (9 Presets)

Built-in presets: dark, light, amber, cyber, ocean, forest, monochrome, sunset, midnight
Custom theme creation with color pickers, export/import JSON
7 CSS variables per theme (bg, secondary, tertiary, text, muted, accent, border)
Commands: theme set <name>, theme list, theme new, theme delete, theme export, theme preview, theme keep

📚 Skills System

17 skills stored as Markdown with YAML frontmatter in VFS /skills/
8 CLI commands: skill-list, skill-view, skill-create, skill-patch, skill-delete, skill-export, skill-import, skill-sync
Skills Manager UI modal (📚 button in quick-actions bar)
Auto-loads relevant skills at start of every AI task
Auto-creates error workaround skills after 3+ repeated failures
In-memory index with 2-second debounced flush to VFS

🎤 Voice Command

🎤 button in input area beside Send button
Green pulse animation while listening, red border on error
SpeechRecognition API (Chrome, Edge, Safari 14.1+), graceful fallback on Firefox
Toggle visibility via quick-actions bar

🔊 Sound Notification

WebAudio "ding" (880Hz sine, 0.3s) after AI response
Togglable via 🔊 Sound / 🔇 Muted button in quick-actions
State persists in localStorage

🔍 Search & Fetch

DuckDuckGo search module with proxy API fallback
SearXNG integration for web search
WebFetcher module for URL content extraction (256KB limit)

Other Notable Modules

Shell — pipes |, redirects > >> <, variables $VAR, chaining && || ;, VFS script execution
BusyBox — 16 utilities: which, env, date, cal, yes, seq, base64, printf, cut, uniq, hostname, whoami, basename, dirname, sleep, expand
CryptoGzip — AES-256-GCM encrypt/decrypt + gzip/gunzip for VFS files
File Manager — Fullscreen overlay with 30% sidebar, 70% preview pane, 10+ preview renderers, live search
WebDAV Sync — 8 commands + modal browser for cloud sync (config, push, pull, backup, restore, del)
Mindmap — ASCII mindmap creation and management in terminal
Text Editor — inline VFS editing via modal (edit/save/cancel)
Calculator, Cron, Diff, Alias, Finder — utility modules covering common needs
Package Manager (WPM) — Web Package Manager for module discovery
Tutorial — Onboarding tutorial for new users
Chat Overlay — Lite chat UI via chat command (toggleable overlay)

Feature Comparison

Feature	Main	Lite	Stable	Plus	newOS4
AI Chat	❌	✅ Streaming	✅ No stream	✅	✅ Agentic
Skills System	❌	❌	❌	❌	✅ 17 skills
AI Tool Calling	❌	❌	❌	❌	✅ 19+ tools
AI Memory	❌	❌	❌	❌	✅ Session save/load
Self-improving	❌	❌	❌	❌	✅ Skills sync
PDF Support	✅ Link	❌	❌	❌	❌
File Manager	❌	❌	❌	❌	✅ Virtual FS
Theme Presets	✅	✅	✅	✅ Custom	✅ 9 presets
Voice Input	❌	❌	❌	❌	✅
i18n	✅ 7 langs	❌	❌	❌	❌
Plan Mode	❌	❌	✅	❌	❌
Session Export	❌	❌	❌	✅	✅ VFS export
File Upload	❌	❌	❌	✅	✅ file attach

Pros & Cons

✅ Self-improving — AI creates, patches, and manages its own skills. 17 skills in VFS with full CRUD CLI.

✅ Rich module ecosystem — 42 module files (25 core + 17 ext), 19 Unix commands, search, fetch, shell, webdav, cron, calc, voice, encrypt, theme, mindmap, editor

✅ Agentic AI — 5-turn tool calling loop, 19+ tool definitions, streaming responses, destructive action confirmation with countdown

✅ 9 Theme Presets — Dark, light, amber, cyber, ocean, forest, monochrome, sunset, midnight + custom theme creation

✅ Auto-save sessions — Dirty-flag auto-save every 60s, VFS crash survival, context restoration on page reload

✅ Virtual File System — localStorage-backed persistent filesystem with trash, checkpoints, grep, tree, find

✅ Inline confirm bar — Non-blocking action confirmation without dark overlay popup. 120s countdown with color escalation.

✅ Clean terminal UX — Autocomplete (commands, files, sessions), command history, pipe support, mobile responsive

✅ Standalone at /spaces/newos4/ — Dedicated instance with nginx autoindex, WebDAV token, full API backend

❌ Ollama dependency — AI features require a running Ollama or compatible provider

❌ 5-turn agent limit — Complex multi-step tasks may hit the tool-call ceiling

❌ No module isolation — All 42 modules share same JS scope, potential for collisions

❌ No TTS — Voice input only (🎤), no text-to-speech for AI responses

❌ No streaming AI — Agent uses non-streaming chat for tool handling; stream is text-only fallback

❌ Single-file pain point — 1,031-line main.html with inline CSS+JS is hard to maintain

❌ 42 file loads — All module scripts loaded sequentially, slow on first visit

Verdict

newOS4 v4.2 is the most feature-rich ChatStudio variant — an in-browser terminal OS with agentic AI, persistent virtual filesystem, skills system, 9 themes, voice input, and 42 modular components. At 52KB for the main HTML (800KB total codebase), it packs enormous functionality into a self-contained browser app.

The key distinction from other variants: newOS4 is a terminal OS, not a chat UI. It's designed for power users who want AI-assisted file management, shell commands, and automated workflows — not just conversation.

Best for: Power users, developers, AI experimentation, anyone who wants a browser-based terminal with learning AI.

Not for: Users who just want quick AI chat, or users without Ollama/OpenRouter access.

Rating: 🧩🧩🧩🧩 (4/5 — most advanced ChatStudio variant, trimmed down from peak but still unmatched in features)

📖 Full documentation available here →