Cloudflare Workers vs Fly.io
Side-by-side comparison of features, pricing, ratings, and alternatives.
Cloudflare Workers lets developers deploy serverless functions to Cloudflare’s global edge network in seconds. The platform supports JavaScript, TypeScript, Python and Rust, offering a familiar development experience without managing servers. With built‑in DDoS protection, automatic scaling and per‑request billing, Workers is ideal for APIs, webhooks, and edge‑rendered content that need low latency worldwide.
Fly.io is a platform that lets developers run full-stack applications and databases on a worldwide network of edge locations. It abstracts infrastructure so you can focus on code while your services run close to users for faster response times.
- Zero cold‑start latency
- Global distribution out of the box
- Pay‑as‑you‑go pricing
- Supports multiple programming languages
- Generous free tier with simple CLI deployment
- Automatic TLS and built-in scaling
- Global deployment and edge locations for faster response times
- Ideal for startups, hobby projects, and production workloads
- Limited execution time (max 50 ms on free tier)
- Debugging can be harder without local edge emulation
- Vendor lock‑in to Cloudflare's network
- Limited control over underlying infrastructure
- May require additional setup for complex applications
- Dependent on Fly.io's network and infrastructure
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The Verdict
AI-generated from listing dataCloudflare Workers offers broader global coverage and higher SLA with pay‑as‑you‑go pricing, while Fly.io provides a simpler CLI and generous free tier for full‑stack apps.
Key differences
- •Global footprint: Cloudflare spans 330+ cities vs Fly’s limited regional list.
- •Execution model: Cloudflare’s edge functions have 50 ms max runtime and zero cold‑start; Fly runs full containers with longer runtimes.
- •Pricing structure: Cloudflare charges per CPU‑microsecond; Fly offers a subscription model with a free tier but no per‑request metering.
- •Developer tooling: Cloudflare supports multiple languages but limited local debugging; Fly emphasizes a single intuitive CLI for deployment.
- •SLA: Cloudflare guarantees 99.99% uptime; Fly’s 99.9% applies only to enterprise plans.
Pricing & value
Cloudflare uses pay‑as‑you‑go microsecond billing, offering finer cost control than Fly's subscription model.
Uptime & reliability
Cloudflare SLA is 99.99% versus Fly's 99.9% (enterprise only).
Performance
Cloudflare runs at edge in 330+ cities with zero cold‑start latency; Fly has fewer regions.
Developer experience
Fly provides a simple, unified CLI for full‑stack deployment; Cloudflare requires handling multiple runtimes and limited local debugging.
Regions & compliance
Cloudflare covers 330+ cities worldwide; Fly lists only broad continents.
Lock‑in
Both services lock you into their proprietary edge networks.
Choose Cloudflare Workers if…
Teams needing ultra‑low latency worldwide and fine‑grained cost control.
Choose Fly.io if…
Startups wanting an easy‑to‑use CLI for full‑stack apps with a generous free tier.
Common questions
Which platform has a higher uptime guarantee?
Cloudflare Workers guarantees 99.99% uptime; Fly.io’s 99.9% SLA applies only to enterprise plans.
Can I run long‑running processes on both services?
Cloudflare limits execution to 50 ms on the free tier; Fly runs full containers with no such short limit.
How does pricing differ between the two?
Cloudflare charges per CPU‑microsecond (pay‑as‑you‑go); Fly uses a subscription model with a free tier but no per‑request metering.