Persona.js vs Spider Cloud

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

Analysis reviewed Live tool data as of 2026-09-01
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At a glance

DimensionPersona.jsSpider Cloud
PricingFree (MIT license)Freemium, paid plans start at $49/mo for 10k credits
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

Lightweight vanilla-JS agent UI library with native WebMCP support.

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Spider Cloud
Spider Cloud

AI web scraping API: crawl, scrape, search any site into markdown or JSON at 10k req/min.

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Pricing
Freemium
Freemium
Plans
$0/mo
Free tier available, paid plans TBD
$1/GB + $0.001/min compute
$40/mo (2 concurrency)
$6/mo
Popularity
13 views
7.5k views
Skill Level
Intermediate
Intermediate
API Available
Platforms
Web
WebAPICLI
Categories
💬 Chatbot Builders🚀 AI App & Website Builders
🌐 Web Scraping & Search APIs🖱️ Browser & Computer-Use Agents
Features
Framework-free vanilla JS library
Three layout modes: floating, docked, fullscreen
WebMCP-native agent tool support
SSE streaming with pluggable parsers
Shadow DOM style isolation
Three-layer theme token system (palette, semantic, component)
Dark mode and live theme editor
Script tag or npm install
Custom fetch and SSE event parsing
Open source (MIT license)
No backend integration required for WebMCP tools
User approval built into tool execution
Voice integration demo
Artifact sidebar demo
Dynamic components demo
Scrape any website into markdown, JSON, or raw HTML
Full-site crawling at 100K+ pages/sec
10,000 core API requests per minute default
Web Search API: SERP + scraping + extraction in one call
/ai/search endpoint with relevance gate to skip irrelevant pages
Silk AI model: HTML-to-structured data and captcha solving on GPUs
Browser Cloud: full browser sessions over CDP
AI commands (Act, Extract, Observe) via WebSocket with AI Studio
Multiple output formats: HTML, raw, plain text, markdown, JSON, JSONL, CSV, XML
Stealth browser layer and Unblocker for anti-bot sites
Proxy pool with 215M+ residential and ISP IPs across 199+ countries
Robots.txt compliance on by default, disable per-request
data_connectors parameter: pipe results to S3, GCS, Google Sheets, Azure Blob, Supabase
extraction_schema parameter: AI output conforms to JSON schema
1,000+ ready-made scraper examples across 32 categories
Integrations
OpenAI
Vercel AI SDK
WebMCP
Runtype
LangGraph
Hono
Express
SvelteKit
LangChain
LlamaIndex
CrewAI
FlowiseAI
AutoGen
Agno

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

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

41 mentions across 2 sources · 0% positive — critical

YouTube, Lemmy

What users praise

  • • Competitive pay-as-you-go pricing at $1/GB with no expiry.
  • • Default rate limit of 10,000 requests per minute is generous.
  • • Broad output formats (HTML, markdown, JSON, CSV) cover diverse needs.
  • • Integrated Web Search API bundles SERP and extraction for AI agents.

What frustrates them

  • • No community feedback to confirm reliability or performance.
  • • Self-reported metrics lack independent verification.
  • • Stealth browser success may vary across real sites.
  • • Potential legal risks from scraping; compliance is user's responsibility.

Researched Aug 26, 2026

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