Overview
Cloudflare and Fastly are leading CDN providers with distinct architectural philosophies. Cloudflare acts as a global security shield focusing on ease of use. Fastly is a programmable edge cloud platform designed for developers who require granular control over caching logic.
| Parameter | Cloudflare | Fastly |
|---|---|---|
| Network (PoP) | 300+ cities | 100+ cities |
| Cache Purge | 2-5 seconds | < 150 ms (Instant Purge) |
| Edge Languages | JS, Rust, C++, Go (Workers) | VCL, Rust, AssemblyScript, Go |
| DDoS Protection | Unmetered (L3/L4/L7) | Tier-based |
| Storage | R2 (S3-compatible) | None (external integrations) |
Performance
Cloudflare wins in "last mile" connectivity due to its massive network density. Fastly focuses on high-performance caching. Their Instant Purge mechanism allows Fastly to cache dynamic content (like stock levels or news feeds) that Cloudflare usually marks as bypass, because Fastly can invalidate it globally in milliseconds using Surrogate Keys.
Configuration & complexity
Cloudflare is dashboard-first and API-driven. Page Rules are easy to set up but can be restrictive for complex logic. Fastly is built on Varnish. Configuration is managed via VCL (Varnish Configuration Language), allowing developers to script the request/response flow directly at the edge.
sub vcl_fetch {
if (beresp.status == 404) {
set beresp.ttl = 10s;
}
}When to choose what
- Cloudflare: DDoS mitigation, general website acceleration, building serverless apps with Workers, cost-effective object storage (R2).
- Fastly: Video streaming, high-churn e-commerce, dynamic APIs requiring sub-second cache invalidation, real-time log streaming.
Cost / licensing
Cloudflare uses a tiered model: Free, Pro ($20), and Business ($200). Enterprise is custom. Fastly uses a consumption-based model with a $50/month minimum. Fastly costs scale linearly with bandwidth and request volume, which requires careful monitoring.
Ecosystem & integrations
Cloudflare provides an all-in-one stack including Zero Trust, domain registration, and edge databases (D1). Fastly excels in observability, offering real-time log streaming to various endpoints like BigQuery or Splunk, and advanced WAF capabilities via Signal Sciences.
Verdict
Cloudflare is the go-to for security and out-of-the-box performance. Fastly is the tool for engineering-heavy teams that need the CDN to behave as a programmable extension of their own infrastructure.