Fastly
Usage BasedFast, programmable content delivery built for developers who need real-time control.
Published 27 September 2026 · Last updated 1 October 2026
Scores
Popularity4/5
Publicly traded since 2019, Fastly gained recognition beyond developer circles after a 2021 configuration change briefly took down a significant portion of the web, and it's the named CDN behind GitHub, Stripe, npm, and Shopify — though its self-serve dashboard reach is far smaller than Cloudflare's free-tier-driven footprint.
Learning Curve4/5
Basic CDN configuration is approachable through the dashboard and REST API, but unlocking Fastly's actual differentiators — custom VCL request logic and the Compute WebAssembly runtime — requires real investment; multiple review sources describe a real learning curve once teams move past the setup wizards.
Flexibility5/5
Varnish Configuration Language exposes the same request-handling logic Fastly's own network runs on, and Fastly Compute accepts arbitrary WebAssembly modules across several languages, giving teams control over caching and routing behavior that point-and-click CDNs don't expose.
Performance5/5
Sub-150-millisecond global purge and unusually high per-PoP network capacity are consistently highlighted differentiators, and the Compute WebAssembly runtime achieves near-native startup times for edge logic; recognized as a Gartner Peer Insights Customers' Choice for Edge Distribution Platforms.
Portability3/5
Fastly fronts any origin server regardless of where it's hosted, so adopting it doesn't require an application rewrite, but VCL configurations and Fastly Compute code are written against Fastly-specific APIs and don't port directly to another CDN's edge-compute runtime.
About Fastly
Fastly is an edge cloud platform that pairs a high-performance CDN with programmable compute at the network edge, built for engineering teams that want direct control over caching and request logic. It was founded in 2011 and is publicly traded (NYSE: FSLY).
The core CDN emphasizes near-instant cache purging, typically under 150 milliseconds globally, and fine-grained routing rules written in Varnish Configuration Language (VCL), which gives developers the same request-handling logic Fastly's own network runs on. Fastly Compute extends this to serverless functions at the edge, executing WebAssembly modules written in languages such as Rust, JavaScript, and Go with near-native startup times, in the same space as Cloudflare Workers and similar edge runtimes.
Beyond delivery, the platform bundles a Next-Gen WAF and bot management for application security, an Image Optimizer for on-the-fly image transforms, and real-time observability into request-level traffic. Everything is managed through one API and dashboard, and the REST API exposes the same capabilities as the UI.
Fastly runs a smaller point-of-presence footprint than hyperscale competitors but with high capacity per location. Pricing is usage-based across bandwidth, requests, and add-on products, with a free tier of usage allowances, volume discounts as consumption grows, preconfigured packages for Network Services, Compute, and Observability, and custom enterprise contracts at higher volumes.
Key Features
- Cache purging typically under 150 ms globally
- Varnish Configuration Language (VCL) for custom request-path logic
- Fastly Compute for WebAssembly edge functions in Rust, JavaScript, and Go
- Next-Gen WAF and bot management
- Image optimization at the edge
- Request-level real-time observability and logging
- REST API that mirrors the dashboard
Pros
- Near-instant cache purging and fine-grained VCL control suit teams with complex caching logic
- Fastly Compute delivers near-native WebAssembly performance for custom edge logic
- High per-location capacity handles sudden traffic spikes
- One API covers delivery, compute, security, and observability
Cons
- VCL has a real learning curve compared to point-and-click CDN configuration
- Usage-based pricing across bandwidth, requests, and add-ons is less predictable than flat-rate competitors like Bunny.net
- Smaller point-of-presence footprint than hyperscale CDNs like Cloudflare or CloudFront
- Dashboard and configuration model can feel complex to newcomers
Fastly Pricing
Usage Based- · Free usage allowances across most services, such as 100 GB of CDN bandwidth and 1M requests
- · Usage-based pricing for prototyping and deploying on the edge platform
- · 500M requests and 5B vCPU milliseconds a month included
- · Preconfigured package
- · 100M requests a month included
- · Preconfigured package
- · 500M requests a month included
- · Preconfigured package
- · Pay for bandwidth, requests, and add-on products consumed
- · Built-in volume discounts as usage grows
- · Custom pricing and enterprise support
- · Advantage and Ultimate packages for complex scale
Tools Related to Fastly
Alternatives to Fastly(3)
Both are developer-first CDNs with programmable edge compute (Fastly Compute vs. Cloudflare Workers), but Cloudflare bundles a much broader free-tier security stack (WAF, DDoS, Zero Trust) while Fastly competes on real-time cache purging and fine-grained VCL control at a higher, usage-based price point.
Both are enterprise-grade, usage-based CDNs favored by teams that need fine-grained control, but CloudFront wins through native AWS integration (S3, Lambda@Edge, WAF) while Fastly wins on real-time purge speed and VCL-based customization independent of any single cloud vendor.
Fastly targets teams that need real-time purging and programmable edge logic and are willing to pay usage-based enterprise pricing for it; Bunny.net targets teams that mainly want cheap, flat-rate bandwidth for static assets and video without that level of control.