If you’re testing a startup prototype and want free or generous free-tier distributed compute for serverless edge execution, the best options are usually the ones that give you:

• easy deploys
• global edge presence
• low/no-cost free tier
• good enough limits for prototyping
• support for HTTP, WebSockets, KV/storage, queues, and cron-like triggers

Here are the best choices, in practical order:

1) Cloudflare Workers

Best overall for edge/serverless prototyping

Why it’s good:

• True edge runtime, very fast globally
• Free tier is very usable for prototypes
• Great developer experience
• Easy to test distributed request handling
• Supports Workers, Pages Functions, Durable Objects, KV, D1, Queues, Cron Triggers

Good for:

• API prototypes
• Edge middleware
• Lightweight backend logic
• Real-time coordination with Durable Objects

Limits:

• Not full Node.js
• Some APIs are restricted
• Free tier has request/CPU limits

Verdict: If your goal is to simulate “real serverless edge,” this is usually the best starting point.

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2) Vercel Edge Functions

Best for frontend-adjacent edge apps

Why it’s good:

• Very easy if your prototype already uses Next.js
• Edge functions are simple to deploy
• Good free tier for small projects
• Great for testing routing, auth, personalization, and edge middleware

Good for:

• Web apps
• Edge middleware
• Server-rendered experiences
• Startup MVPs tied to a frontend

Limits:

• Edge runtime constraints
• Free tier can be tight for heavier backend testing
• Less “distributed compute” oriented than Cloudflare

Verdict: Best if your prototype is web-product-first and you want quick edge deployment.

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3) Netlify Edge Functions

Best for simple edge demos and static-site-backed prototypes

Why it’s good:

• Straightforward deployment
• Easy integration with static sites
• Useful free tier for basic experimentation
• Good if you’re already using Netlify hosting

Good for:

• Lightweight serverless edge logic
• A/B testing
• Authentication hooks
• Content personalization

Limits:

• Less flexible than Cloudflare for advanced distributed workloads
• Smaller ecosystem for edge-native primitives

Verdict: Good, but usually behind Cloudflare/Vercel for serious edge compute prototyping.

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4) Deno Deploy

Best for modern edge-style TypeScript prototyping

Why it’s good:

• Very clean developer experience
• TypeScript-native
• Edge-friendly runtime model
• Great for fast iteration on distributed HTTP services

Good for:

• API prototypes
• Small edge services
• TypeScript-first teams

Limits:

• Smaller ecosystem than the big two
• Fewer edge primitives and less widespread adoption

Verdict: Excellent if your team likes TypeScript and wants a minimal, elegant edge runtime.

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5) Fastly Compute

Best for serious edge architecture testing, but free access is less straightforward

Why it’s good:

• Very fast edge runtime
• Strong for performance-oriented edge apps
• Popular for advanced edge networking use cases

Limits:

• Less beginner-friendly
• Free/prototype access is not as simple or generous as Cloudflare’s
• More enterprise-leaning

Verdict: Powerful, but not usually the easiest “free startup prototype” option.

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6) Fly.io

Best for distributed app-like compute rather than pure edge functions

Why it’s good:

• Can run services close to users in multiple regions
• Good for containers and stateful-ish workloads
• Useful if you need more than pure edge-function constraints

Limits:

• Not a pure edge-functions platform
• Free resources are more limited than they used to be
• More operational overhead than Workers/Edge Functions

Verdict: Great if you want distributed deployment and containers, not just edge handlers.

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7) Supabase Edge Functions

Best if your prototype is already database-centric

Why it’s good:

• Good integration with Postgres/auth/storage
• Useful for backend logic close to your data
• Free tier is helpful for MVPs

Limits:

• More “backend serverless” than true global edge
• Not the best for simulating a globally distributed edge network

Verdict: Best when your app is already centered on Supabase.

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Best picks by use case

If you want the closest thing to “real edge compute”

Choose Cloudflare Workers

If you’re building a web app with frontend + edge middleware

Choose Vercel Edge Functions

If you want TypeScript-first simplicity

Choose Deno Deploy

If you need container-based distributed services

Choose Fly.io

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My practical recommendation for a startup prototype

If you want the best free provider to test serverless edge execution, start with:

1. Cloudflare Workers
2. Vercel Edge Functions if you’re building a Next.js app
3. Deno Deploy if you want a very clean TS runtime

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A simple decision rule

• Global edge APIs / distributed request logic → Cloudflare Workers
• Next.js app with edge middleware → Vercel
• TypeScript microservices → Deno Deploy
• More stateful distributed containers → Fly.io

If you want, I can also give you:

1. a comparison table of free-tier limits,
2. a recommendation for your specific architecture, or
3. a benchmark plan to test edge latency across providers.