Retrace 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

DimensionRetraceSpider Cloud
PricingFree Hobby tier; Pro at $39/mo; Team at $99/moFree tier (500 credits/mo); Pay-as-you-go from $0.003/credit; AI Studio add-on $6/mo
Core FocusDebugging & observability for AI agent runsWeb crawling & scraping for AI agents
Key FeatureFork & replay agent runs in sandboxRust-based high-speed crawling engine
IntegrationsLangChain, CrewAI, AutoGen, custom SDKsLangChain, LlamaIndex, CrewAI, FlowiseAI, AutoGen, Agno, Dify
Best ForTeams debugging multi-step agent workflowsRAG pipelines needing up-to-date web data
Latest News ImpactNo recent product updates; unrelated retraction newsBrowser AI commands (Act/Extract/Observe) via WebSocket; scraper catalog; data connectors

Choose Retrace if you obsess over agent run quality and need to debug/fork every step. Choose Spider Cloud if your agent's main bottleneck is getting fresh web data cheaply and at scale. For most AI developers, these tools are complementary rather than competitive.

Try RetraceTry Spider Cloud
Retrace
Retrace

Record, replay, and debug AI agent runs to fix production issues faster.

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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
$29/mo
$99/mo
$399/mo
Contact us
$1/GB + $0.001/min compute
$40/mo (2 concurrency)
$6/mo
Popularity
7 views
7.5k views
Skill Level
Advanced
Intermediate
API Available
Platforms
WebAPICLI
WebAPICLI
Categories
📡 LLM Observability & Evals
🌐 Web Scraping & Search APIs🖱️ Browser & Computer-Use Agents
Features
Record and replay agent runs
Fork from any step and re-run in sandbox
Prove-the-fix verdict: improved, regressed, unchanged
Step-by-step execution timeline with state inspection
Guardrails and circuit breakers for loops and budgets
Eval gates for CI/CD regression testing
Automatic failure classification (MAST)
Multi-agent session tracing with causal graphs
Semantic search: describe bugs in plain language
Cassette VCR replay for deterministic re-runs
Real-time streaming of agent events
Diff view comparing two runs
Export runs to JSON/CSV for external analysis
Role-based access control (RBAC)
Self-hosted deployment option for enterprise
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
LangChain
CrewAI
LlamaIndex
OpenAI
Anthropic
Gemini
FlowiseAI
AutoGen
Agno

What real users say: Retrace 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.

Retrace

47 mentions across 3 sources · 35% positive — critical

Hacker News, GitHub, Lemmy

What users praise

  • • Fork and replay agent runs to reproduce and fix failures deterministically.
  • • Step-by-step execution timeline with full state inspection at each turn.
  • • Side-effect free re-runs: no external API calls during replay forks.
  • • Integrates directly with LangChain, CrewAI, AutoGen, and custom SDKs.

What frustrates them

  • • Code changes during replay cause divergence, limiting what-if experimentation.
  • • Very limited community presence, making peer support scarce.
  • • No Reddit, YouTube, or Product Hunt coverage to evaluate real-world usage.
  • • Notion of separate open-source project with same name causes confusion when searching online.

Researched Jul 3, 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 founder debugging agent workflows
    Pick: Retrace

    Retrace's free Hobby tier provides fork/replay and step-by-step inspection, perfect for iterating on multi-step agents without upfront cost.

  • RAG pipeline developer needing fresh web data
    Pick: Spider Cloud

    Spider Cloud's cheap crawling ($0.03/1000 pages) and data connectors to S3/GCS/Supabase make it ideal for feeding timely content into vector stores.

  • Engineering team monitoring production agents
    Pick: Retrace

    Team tier ($99/mo) gives RBAC, anomaly detection, and shareable run snapshots—critical for collaborative debugging.

  • AI Studio user wanting natural language crawling
    Pick: Spider Cloud

    Spider Cloud's AI Studio add-on ($6/mo) lets non-engineers specify crawl goals in plain language.

  • Researcher needing to reproduce agent failures
    Pick: Retrace

    Retrace's sandbox forks and diff views allow exact reproduction and comparison without external side effects.

Frequently Asked Questions

Retrace vs Spider Cloud: which should you choose?

Choose Retrace if you obsess over agent run quality and need to debug/fork every step. Choose Spider Cloud if your agent's main bottleneck is getting fresh web data cheaply and at scale. For most AI developers, these tools are complementary rather than competitive.

Can I use both Retrace and Spider Cloud together?

Yes. Spider Cloud fetches web data for your agent, and Retrace debugs the agent's runs. They complement each other.

Which tool is better for a LangChain agent?

Both integrate with LangChain. Use Retrace for debugging and Spider Cloud for web search/crawling.

Does Retrace support on-prem deployment?

Yes, Retrace offers an on-prem deployment option for sensitive data.

Does Spider Cloud charge for failed requests?

No, failed requests are not billed.

What is the pricing of Retrace's Hobby tier?

Retrace's Hobby tier is free.

What's new in Spider Cloud as of March 2026?

New Browser AI commands (Act, Extract, Observe) via WebSocket, scraper catalog with 1000+ examples, and data connectors to cloud storage.

Which tool has a diff view for comparing runs?

Retrace offers a diff view comparing two runs.

Is Spider Cloud suitable for one-off scraping tasks?

Yes, but for simple one-off tasks a lightweight library may be easier.

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Explore each tool further

Retrace
View Retrace reviewRetrace alternatives
Spider Cloud
View Spider Cloud reviewSpider Cloud alternatives

Browse these categories

Best AI LLM Observability & Evals toolsBest AI Web Scraping & Search APIs toolsBest AI Browser & Computer-Use Agents tools
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Last reviewed: July 3, 2026