Persona.js vs Spider Cloud

Side-by-side comparison of features, pricing, and ratings

Analysis reviewed Live tool data as of 2026-10-18
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At a glance

DimensionPersona.jsSpider Cloud
Primary Use CaseEmbeddable AI chat UI for websitesWeb crawling & scraping API for AI agents
Integration StyleFront-end library (JS, no framework required)Backend API with SDKs & AI framework integrations
Open SourceYes (MIT)Yes (core engine on GitHub)
Best ForAdding a customizable agent chat UI to any websiteFetching web data for RAG, LLMs, and AI agents
Latest News2026-06-20: Released on Show HN with native WebMCP support2026-03-05: Browser AI commands for Act, Extract, Observe

Persona.js and Spider Cloud solve different problems—one provides a front-end chat UI, the other a back-end data extraction API. Choose Persona.js if you need a free, open-source, vanilla-JS chat interface to drop into any website. Choose Spider Cloud if you need a high-performance web scraping API for AI agents, especially with its new Browser AI commands and data connectors. They can be complementary: use Spider Cloud to fetch data for your RAG pipeline and Persona.js to display the chat UI.

Try Persona.jsTry Spider Cloud
Persona.js
Persona.js

MIT-licensed vanilla-JS library for embedding agentic chat UIs that can drive your page through WebMCP tools.

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Spider Cloud
Spider Cloud

Spider Cloud is a web scraping, crawling, and search API that streams live pages as markdown or JSON for AI agents and RAG pipelines.

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Pricing
Freemium
Freemium
Plans
$0/mo
Free tier available, paid plans TBD
$1/GB + $0.0001/CPU-min
From $6/mo
From $40/mo
Custom
Popularity
21 views
7.5k views
Skill Level
Intermediate
Intermediate
API Available
Platforms
Web
WebAPIPluginCLIDesktop
Categories
💬 Chatbot Builders🚀 AI App & Website Builders
🌐 Web Scraping & Search APIs🖱️ Browser & Computer-Use Agents
Features
Framework-free vanilla JS library
npm install @runtypelabs/persona or CDN script tag install
Three layout modes: floating launcher, docked panel, fullscreen assistant
Docked mode with configurable side and width (dock: { side: "right", width: "420px" })
Fullscreen mode with launcher disabled and fullHeight
WebMCP-native agent tool support via document.modelContext.registerTool
User approval built into tool execution
No backend integration required for WebMCP page tools
SSE streaming with pluggable parsers
Custom fetch and parseSSEEvent hooks
Shadow DOM style isolation with prefixed CSS
Three-layer theme token system (palette, semantic, component)
Dark mode and live theme editor
Artifact split in fullscreen layout
Runtype CLI setup: npx @runtypelabs/cli@latest persona init
Scrape a single page into markdown, JSON, HTML, raw, or plain text
Crawl entire sites with each page streamed as one JSONL line in order as it finishes
Web search endpoint returns SERP results plus the scraped pages behind them
Custom browser renders like a user: scripts run, lazy images load, infinite scroll reaches the end
Load protected pages through a real browser engine with geo checks, returning a 200
Run full browser sessions over WebSocket with anti-detection and rotating exits
Send AI commands (Act, Extract, Observe) over the Browser API WebSocket
Send a prompt on a scrape or crawl request and get named fields back as JSON
Two-phase AI extraction: a fast model for most pages, a stronger model for complex layouts
Provider router sends scrape and crawl requests to outside providers on your own keys
Data connectors pipe crawl results into S3, GCS, Google Sheets, Azure Blob, or Supabase
Proxy network with 215M+ residential and ISP exits in 199 countries, rotated per request
MCP server at mcp.spider.cloud for Claude Code, Codex, Cursor, and Claude Desktop
1,000+ ready-made scraper examples across 32 categories, each with working code
API responses support JSON, JSONL, CSV, and XML; up to 10,000 core API requests per minute by default
Integrations
OpenAI Agents SDK
Vercel AI SDK
WebMCP
LangGraph.js
Hono
Express
SvelteKit
Runtype
LangChain
LlamaIndex
CrewAI
FlowiseAI
Langflow
Dify
Agno
MCP
Claude Code
Codex
Cursor
Claude Desktop
Amazon S3
Google Cloud Storage
Google Sheets

What real users say: Persona.js vs Spider Cloud

Not marketing copy and not our opinion — a structured sweep of public discussion (reviews, forums, communities and video comments), showing what people praise and what they complain about for each tool.

Persona.js

18 mentions across 3 sources · 68% positive (averaged across 3 sources)

Hacker News, Product Hunt, Lemmy

What users praise

  • • Framework-agnostic vanilla JS works with any stack or no framework.
  • • WebMCP-native integration enables agents to drive real UI actions cleanly.
  • • Three layout modes: floating launcher, docked panel, fullscreen assistant.
  • • Shadow DOM isolates styles from host page, preventing CSS conflicts.

What frustrates them

  • • Safety around agent-driven UI actions lacks robust tool-call preview.
  • • Chain-of-call vulnerabilities between read-only and mutative tools.
  • • Token usage can spike when exposing simple frontend states via WebMCP.
  • • Granular control over which UI actions become tools is limited.

Researched Jul 2, 2026

Spider Cloud

No verifiable community signal. We scanned public discussion on Oct 14, 2026 and found posts matching the name “Spider Cloud”, but could not establish that they are about this product rather than something else sharing its name. Rather than publish a score built on the wrong subject, we publish none.

Who should pick which

  • Solo developer building an AI chatbot on personal website
    Pick: Persona.js

    Free, open-source, and easy to embed via script tag—no backend required for chat UI.

  • AI agent developer needing real-time web data for RAG
    Pick: Spider Cloud

    High-performance crawling with structured output and LangChain/LlamaIndex integrations, plus Browser AI commands for dynamic sites.

  • Startup building a copilot experience with custom tools
    Pick: Persona.js

    WebMCP-native agent tool support and flexible layouts allow deep customization without framework lock-in.

  • Data scientist scraping e-commerce sites for analysis
    Pick: Spider Cloud

    Robust anti-detection, 1,000+ scraper examples, and data connectors to S3/Sheets make it production-ready.

  • Team wanting both: data pipeline and chat UI
    Pick: Spider Cloud

    Spider Cloud feeds data to LLMs; pair with Persona.js for the front-end chat UI (both open source).

Frequently Asked Questions

Persona.js vs Spider Cloud: which should you choose?

Persona.js and Spider Cloud solve different problems—one provides a front-end chat UI, the other a back-end data extraction API. Choose Persona.js if you need a free, open-source, vanilla-JS chat interface to drop into any website. Choose Spider Cloud if you need a high-performance web scraping API for AI agents, especially with its new Browser AI commands and data connectors. They can be complementary: use Spider Cloud to fetch data for your RAG pipeline and Persona.js to display the chat UI.

Can Persona.js work with Spider Cloud?

Yes, they are complementary: Spider Cloud fetches data, Persona.js displays the chat UI. They don't directly integrate but can be used together in a stack.

Does Persona.js require a backend?

No, but it expects an SSE endpoint or WebMCP backend. It does not include hosting.

Is Spider Cloud fully open source?

The core engine is open source on GitHub, but the cloud service with stealth features and Browser AI commands is proprietary.

What is WebMCP?

WebMCP is a protocol for agent tool execution over SSE; Persona.js natively supports it.

Does Spider Cloud have a free tier?

Yes, a freemium model with limited credits. Paid plans start at $49/mo.

Can I use Persona.js with React?

Yes, Persona.js is framework-free, so it works with React, Vue, Angular, or vanilla JS.

What are Browser AI commands in Spider Cloud?

They allow AI-driven actions like clicking, typing, extracting data, and describing pages via WebSocket, added March 2026.

Does Spider Cloud support data connectors?

Yes, it supports S3, GCS, Google Sheets, Azure Blob, and Supabase as of February 2026.

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Explore each tool further

Persona.js
View Persona.js reviewPersona.js alternatives
Spider Cloud
View Spider Cloud reviewSpider Cloud alternatives

Browse these categories

Best AI Chatbot Builders toolsBest AI Web Scraping & Search APIs toolsBest AI AI App & Website Builders toolsBest AI Browser & Computer-Use Agents tools
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Last reviewed: July 2, 2026