Best Free CDN and Security Services for Web Applications

The best free CDN and security services for web applications include jsDelivr, UNPKG, and cdnjs for content delivery, alongside Namecheap Supersonic and OVH for DDoS protection and SSL termination, all documented in the ripienaar/free-for-dev repository.

Modern web applications require robust infrastructure to deliver static assets quickly while defending against malicious traffic. According to the ripienaar/free-for-dev repository—a curated index of free developer services maintained in README.md—developers can access enterprise-grade CDN and security tools without monthly costs. This guide examines the top free CDN and security services for web applications available in the source code.

Free CDN Services for Static Assets

Content Delivery Networks cache static files at edge locations worldwide, reducing latency and bandwidth costs. The README.md file in ripienaar/free-for-dev lists several high-performance options.

jsDelivr: Multi-Source Package Delivery

jsDelivr serves as an ultra-fast open-source CDN that pulls packages from npm, GitHub, WordPress, and Deno. As noted at line 972 of README.md, it automatically selects the optimal edge server based on user location.

<img src="https://cdn.jsdelivr.net/gh/username/[email protected]/assets/logo.svg" alt="Logo">

This example fetches a GitHub-hosted asset, which jsDelivr caches at edge locations for optimal delivery.

UNPKG: Direct NPM Access

UNPKG mirrors every package published to npm, making it ideal for on-the-fly module loading without build steps. The repository entry at line 822 confirms it resolves any npm package version instantly.

<script type="module">
  import _ from 'https://unpkg.com/[email protected]/lodash-es.js';
  console.log(_.chunk([1,2,3,4,5], 2));
</script>

cdnjs: Cloudflare-Powered Community CDN

cdnjs is a community-maintained CDN powered by Cloudflare that covers more than 11% of the web. According to line 969 of README.md, it provides automatic SSL and global caching for popular libraries.

BootstrapCDN: Framework-Specific Hosting

BootstrapCDN specializes in serving Bootstrap, Bootswatch, and Font Awesome from a global edge network. Line 967 of the source file confirms it hosts these specific frameworks with high availability.

<link
  rel="stylesheet"
  href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css"
/>

CacheFly: High-Traffic Static Sites

CacheFly offers a generous 5 TB per month of free traffic with SSL included, making it ideal for heavy-traffic static sites. This specification appears at line 968 of README.md.

Gcore: Emerging Market Coverage

Gcore provides 1 TB of traffic plus 1 million requests monthly, along with free DNS hosting. As noted at line 971, this makes it particularly valuable for applications serving users in emerging markets.

Free Security and DDoS Protection Services

Protecting web applications requires shielding origins from DDoS floods, injecting TLS, and blocking malicious traffic. The README.md file in ripienaar/free-for-dev documents several robust free tiers.

Namecheap Supersonic: Automatic SSL and DDoS Protection

Namecheap Supersonic provides a free tier that includes automatic SSL termination and DDoS protection. According to line 974 of the repository, adding their provided DNS record automatically injects security headers including HSTS.

add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;

This configuration enforces HTTPS connections across all subdomains when using Supersonic.

OVH: Free DDoS Mitigation

OVH offers free DDoS mitigation and SSL gateway functionality that can be toggled per-domain. Line 975 of README.md confirms this protection applies to all domains using OVH's infrastructure.

PromoProxy: Secure Web Gateway

PromoProxy operates as a cloud Secure Web Gateway with a free plan supporting 5 users and 1 GB of daily traffic. As documented at line 976, this service filters malicious content before it reaches the application.

Cloudflare Workers: Edge-Based Rate Limiting

While not explicitly listed as a standalone security service, Cloudflare Workers (referenced in the context of cdnjs at line 969) enable custom security logic at the edge. The free tier supports 100,000 requests daily.

addEventListener('fetch', event => {
  const ip = event.request.headers.get('CF-Connecting-IP');
  // naive token-bucket per IP (store in KV)
  event.respondWith(handleRequest(event.request, ip));
});

This example demonstrates implementing IP-based rate limiting without origin server modifications.

Implementation Architecture

Combining these services creates a resilient delivery stack. The index.html file in ripienaar/free-for-dev demonstrates how these resources load in production environments.

1. Asset Origin – Store static files in a repository or storage bucket.
2. Edge Cache – Use jsDelivr or UNPKG to cache assets at global Points of Presence (PoPs).
3. TLS Termination – Route traffic through Namecheap Supersonic or OVH for automatic HTTPS.
4. Request Filtering – Implement Cloudflare Workers for custom rate limiting.
5. Graceful Degradation – Maintain origin accessibility if CDN edge fails.

This architecture delivers sub-second page loads and built-in DDoS mitigation without monthly costs, as evidenced by the service listings in README.md and the frontend implementation in index.html.

Summary

• jsDelivr and UNPKG provide unlimited free CDN access for npm packages and GitHub assets, as documented in lines 972 and 822 of README.md.
• cdnjs leverages Cloudflare's infrastructure to serve libraries to over 11% of the web (line 969).
• CacheFly and Gcore offer substantial free bandwidth tiers (5 TB and 1 TB respectively) for high-traffic applications (lines 968, 971).
• Namecheap Supersonic and OVH deliver free DDoS protection and automatic SSL termination (lines 974, 975).
• PromoProxy provides secure web gateway functionality for small teams (line 976).
• Cloudflare Workers enable edge-based security logic including rate limiting on the free tier.

Frequently Asked Questions

What is the difference between jsDelivr and UNPKG?

jsDelivr pulls from multiple sources including npm, GitHub, WordPress, and Deno, automatically optimizing delivery based on user location. UNPKG exclusively mirrors npm packages, making it ideal for direct module imports in browser environments without build steps. Both are listed in README.md at lines 972 and 822 respectively.

How much free bandwidth do these CDN services offer?

Bandwidth allowances vary by provider. CacheFly provides 5 TB per month (line 968), while Gcore offers 1 TB plus 1 million requests monthly (line 971). Services like jsDelivr, UNPKG, and cdnjs do not impose strict bandwidth limits for open-source projects, relying instead on global edge networks to handle traffic.

Can I use these security services with custom domains?

Yes. Namecheap Supersonic (line 974) and OVH (line 975) both support custom domains with free SSL certificates and DDoS protection. You typically add a DNS record provided by the service, which then handles TLS termination and traffic filtering before requests reach your origin server.

Are these free tiers suitable for production applications?

These free tiers are suitable for production use within their documented limits. CacheFly's 5 TB allocation (line 968) handles significant traffic, while Namecheap Supersonic and OVH provide enterprise-grade DDoS protection (lines 974-975) comparable to paid alternatives. For mission-critical applications, monitor usage against free tier limits and implement fallback strategies as described in the index.html implementation patterns.

{
  "mcpServers": {
    "instagit": {
      "command": "npx",
      "args": ["-y", "instagit@latest"]
    }
  }
}