Six edge runtimes, three real choices — pick by the runtime constraint, not the marketing
Cloudflare Workers, Vercel Edge, Deno Deploy, Bun, Lambda@Edge, Fastly Compute. The runtime semantics, the cost curves, the production reality of running compute at the edge in 2026.
READ THE FULL COMPARISONThe runtimes, ranked by the constraint that picks each one
Cloudflare Workers
Edge-first, V8 isolates, lowest cost at scale
V8 isolates running in 300+ cities. Sub-millisecond cold starts. Pay-per-request pricing. Smaller Node-API surface than Vercel; you write to the Workers runtime. Right call when cost at scale is the constraint and you can adopt the runtime constraints.
Read the take →Vercel Edge Functions
Edge runtime tied to the Next.js workflow
Edge runtime in the Vercel platform — same DX as the rest of Vercel, edge-first when you want it, Node when you do not. Right call when the team is shipping Next.js and edge is one of several runtime targets, not the only one.
Read the take →Deno Deploy
Modern runtime, Deno-flavoured
TypeScript-first edge runtime by the creators of Deno. Web-standard APIs, no node_modules. Right call when you want a clean modern runtime and the team is open to writing Deno-style imports.
Read the take →Bun
Node-compatible, fast, JS runtime first
JavaScript runtime + bundler + package manager + test runner in one binary. Drop-in for Node in most cases, faster startup. Edge story is via Bun on Cloudflare Workers or self-hosted. Right call for teams modernising their Node toolchain.
Read the take →AWS Lambda@Edge / CloudFront Functions
Edge in the AWS world
Lambda@Edge for fuller compute, CloudFront Functions for sub-millisecond pure-JS. The right answer when the rest of the stack is AWS and bringing in another vendor is procurement friction.
Read the take →Fastly Compute
WASM-first, very fast
WebAssembly-based edge compute, Rust / Go / AssemblyScript / JS. Strongest at low-latency, highest engineering bar. Right call when latency budget is single-digit milliseconds and the team has the engineering bandwidth.
Read the take →The decision in one sentence
Pick Cloudflare Workers if cost at scale is the constraint and the team can adopt the V8-isolate runtime. Pick Vercel Edge if you are already on Vercel and edge is one of several runtime targets. Pick Deno Deploy if you want a clean modern TypeScript-first runtime. Pick Bun if you are modernising the Node toolchain and want a faster runtime, with edge as a deployment target rather than the protagonist. Pick Fastly Compute only when latency budget is single-digit milliseconds and the team has the WASM bandwidth.
The supporting comparisons
The full directory of 10 edge runtimes
This hub is the editorial top-5. The full directory at /edge-compute/ covers 10 runtimes across 5 categories (V8 isolate / serverless / WASM / CDN-attached / JS runtime), filterable by language, pricing, cold-start, and Node compatibility — including the niche options the top-5 cuts: Lambda@Edge, CloudFront Functions, Akamai EdgeWorkers, Fastly Compute, WasmEdge, Bun, Fly Machines.