Fly.io vs Spider Cloud
Side-by-side comparison of features, pricing, and ratings
At a glance
| Dimension | Fly.io | Spider Cloud |
|---|---|---|
| Pricing | Free tier includes $5/mo credit; usage-based beyond | Pay-as-you-go, credits-based; free tier available |
| Primary Use | Deploy and run any code in isolated sandboxes | Web crawling and data extraction for AI agents |
| Ease of Use | CLI-based, auto-generates containers for popular frameworks | Single API, SDKs for Python/Node.js/Rust |
| Target Audience | Developers deploying distributed systems or untrusted code | AI developers needing web data for RAG/LLMs |
| Unique Feature | Sprites sandboxes for safe AI-generated code, hardware isolation | AI-native output (markdown/JSON), anti-bot bypass with 199 proxies |
| Integrations | None listed | LangChain, LlamaIndex, CrewAI, AutoGen, etc. |
Choose Spider Cloud if your primary need is extracting clean web data for AI agents or RAG pipelines — it offers unmatched throughput and structured output. Choose Fly.io if you need to deploy and scale custom applications or run untrusted AI-generated code in isolated sandboxes with global low-latency.

Fastest web crawler API for AI agents — Rust-based, pay-as-you-go, 99.9% success rate.
Visit WebsiteFeature-by-feature
Spider Cloud focuses on web data extraction with a Rust-based engine that handles 100K+ pages per second and 99.9% success rate. It provides AI-native output (markdown, JSON, screenshots) and anti-bot bypass via 199 proxy countries. Key features include headless browser automation, AI extraction with schema enforcement, and relevance gating to skip irrelevant pages before billing. It integrates with major AI frameworks like LangChain, LlamaIndex, and CrewAI. Fly.io, on the other hand, is a compute platform for deploying any code in hardware-isolated sandboxes with KVM virtualization. It offers Fly Machines that launch instantly and autoscale, private networking, global storage, and Sprites sandboxes specifically for running AI-generated code safely. Fly.io provides zero-downtime deploys, 18 regions worldwide, and supports any framework via CLI auto-generated containers. It lacks web scraping features but excels in running custom applications. While both target developers, Spider Cloud is a specialized data extraction API, whereas Fly.io is a general-purpose deployment platform.
Pricing compared
Spider Cloud uses a pay-as-you-go credits model with a free tier (limited usage). Pricing is based on credits consumed per request, with no mention of specific tiers. Enterprise options are available. Fly.io offers a free tier with a $5/mo compute credit, plus additional free allowances for bandwidth, storage, and certain services. Beyond that, pricing is usage-based for compute, storage, and egress. Both are consumption-based, but Spider Cloud's pricing is tied to data extraction volume, while Fly.io's is tied to compute resources and network usage. For heavy scraping workloads, Spider Cloud may cost less than running a scraping infrastructure on Fly.io. However, for deploying a custom app, Fly.io's free tier is generous.
Who should pick which
- AI RAG developerPick: Spider Cloud
Spider Cloud provides structured data extraction and integrates directly with LangChain and LlamaIndex, perfect for building retrieval-augmented generation pipelines.
- Solo founder deploying a web appPick: Fly.io
Fly.io's free tier and auto-scaling make it easy to deploy any framework globally with minimal configuration.
- LLM researcher collecting datasetsPick: Spider Cloud
Spider Cloud can crawl 100K+ pages per second and output clean markdown/JSON, ideal for training data collection.
- Developer running untrusted AI codePick: Fly.io
Fly.io's Sprites sandboxes provide hardware isolation for executing AI-generated code safely.
- Enterprise needing dedicated scraping infrastructurePick: Spider Cloud
Spider Cloud offers 199 proxy countries, anti-bot bypass, and data connectors to cloud storage for scalable scraping.
Frequently Asked Questions
Can Spider Cloud be self-hosted?
Yes, the crawler engine is open-source (MIT) on GitHub, allowing self-hosting.
Does Fly.io support databases?
Yes, it supports clustered databases like Cockroach and globally-distributed Postgres with private networking.
Which tool is better for RAG pipelines?
Spider Cloud is better due to its AI-native output and integrations with LangChain and LlamaIndex.
Can I run Python/Node apps on Fly.io?
Yes, Fly.io supports any framework via CLI auto-generated containers, including Node, Django, and .NET.
Does Spider Cloud have a free tier?
Yes, it offers a free tier with limited credits, but for substantial usage it is pay-as-you-go.
What is Fly.io's free tier?
It includes a $5/mo credit for compute and free allowances for bandwidth and storage.
Can Spider Cloud handle JavaScript-rendered pages?
Yes, it uses a headless browser with CDP and BiDi protocol support for dynamic content.
Is Fly.io SOC2 compliant?
Yes, Fly.io is SOC2 Type 2 certified.
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