How to Host a Validation Site on Cloudflare's Free Tier

Why Cloudflare for Validation Sites

The validation stage has one financial requirement: keep hosting costs at zero until you’ve confirmed demand. Cloudflare’s free tier is designed exactly for this.

Three alternatives founders typically consider:

• Vercel free tier: SSR functions limited to 100 GB-hours execution per month; bandwidth at 100 GB. Fine for small sites, but the edge function limits are tighter than Cloudflare’s.
• Netlify free tier: 125,000 serverless function invocations per month; 100 GB bandwidth. Similar to Vercel with slightly different limits.
• Cloudflare free tier: 100,000 Worker requests per day (resets daily), not monthly. For a site getting 1,000 API calls per day, you have 99,000 requests left. Plus D1 database, R2 storage, and global CDN at no cost.

For a validation site with email capture, pricing click tracking, and a post-signup survey, Cloudflare’s free tier is the most generous option available.

What the Free Tier Actually Covers

Here’s exactly what you get at $0/month:

Cloudflare Pages (static hosting):

• Unlimited bandwidth
• Unlimited requests to static assets
• Global CDN (300+ locations)
• 500 builds per month (each git push = one build)
• Automatic HTTPS on all custom domains
• Preview deployments for every branch

Cloudflare Pages Functions (serverless API):

• 100,000 requests per day (resets at midnight UTC)
• 10ms CPU time per invocation (free tier)
• Access to D1, KV, R2, and other bindings

Cloudflare D1 (SQLite database):

• 5 GB database storage
• 25 million row reads per day
• 100,000 row writes per day
• Standard SQL syntax

Cloudflare R2 (file storage):

• 10 GB included
• Zero egress fees (unlike S3)

For a validation site, the only limit you might hit is the 100,000 daily Worker requests if you’re running a successful paid acquisition campaign. At that point, the paid Workers plan is $5/month — still effectively free.

Setup Walkthrough

1. Install Wrangler and Authenticate

npm install -g wrangler
wrangler login

This opens a browser window for OAuth. Once authenticated, Wrangler can manage all Cloudflare resources for your account.

2. Configure Your Astro Project

In astro.config.ts:

import { defineConfig } from 'astro/config';
import cloudflare from '@astrojs/cloudflare';

export default defineConfig({
  output: 'server',
  adapter: cloudflare(),
});

Use output: 'server' if you have API routes that need D1 access. Use output: 'static' if your site is purely static with no server-side logic.

3. Create Your D1 Database

wrangler d1 create your-validation-db

Copy the database_id from the output. Add to wrangler.toml:

[[d1_databases]]
binding = "DB"
database_name = "your-validation-db"
database_id = "paste-your-id-here"

4. Add Environment Variables

Secrets (API keys) go in Wrangler, not in .env files:

wrangler pages secret put RESEND_API_KEY
wrangler pages secret put APOLLO_API_KEY

Non-secret config goes in wrangler.toml under [vars]:

[vars]
PRODUCT_NAME = "Validea"
EMAIL_FROM = "hello@validea.dev"

import InlineSignup from ‘@validation/ui/components/inline-signup.astro’;

5. Deploy

astro build
wrangler pages deploy dist

Your site gets a *.pages.dev subdomain immediately. Add a custom domain in the Cloudflare dashboard under Pages → your project → Custom Domains.

6. Apply Database Migrations

For local development:

wrangler d1 migrations apply your-validation-db --local

For production:

wrangler d1 migrations apply your-validation-db --remote

Limitations to Know

CPU time per request: The free tier limits each Worker invocation to 10ms of CPU time. For a simple email capture or pricing click record, this is more than enough. For heavy computation or large database queries, the 10ms limit can be hit. The paid tier gives 50ms per request.

No scheduled cron on free tier: Cloudflare Workers Cron Triggers require a paid Workers account ($5/month). If your validation site needs scheduled tasks (survey reminder emails, weekly stats), you need the paid Workers plan for the cron Worker — your Pages project itself can stay on the free tier.

D1 is eventually consistent at the edge: D1 reads are served from the nearest edge location, which means a write may not be immediately visible on a read from a different location. For validation data (email signups, click tracking), this is not a practical problem. All writes go to the primary and replicate within seconds.

Cost at Scale

When your validation succeeds and traffic grows, the cost curve is still favorable:

Most validation sites never exceed the free tier. Those that do are typically handling traffic levels where the $5/month upgrade is the smallest line item in the budget.

import DefinitionBlock from ‘@validation/ui/seo/definition-block.astro’; import AnswerBlock from ‘@validation/ui/seo/answer-block.astro’;