What Developer Resources Like CDN, Fonts, and Favicon APIs Does upset.dev Provide?

Updated

upset.dev is a collection of open-source software, services, and experiments for builders and developers, organized into a Products section and an Open Source section. The developer resources most relevant to CDN, fonts, and favicon needs are Statically (a global CDN for Git repositories, npm, and open source projects), Fonts (a privacy-friendly Google Fonts alternative), Favicone (a favicon-fetching API), and BlobCDN (an SVG blob generator). All four are listed as products on the site; the page does not state pricing for any of them, so treat "free" claims as unconfirmed unless a specific product page says otherwise.

CDN and asset delivery

Statically

The site describes Statically as "a free and fast global CDN for Git repositories, npm, and open source projects." In practice, this is the resource to reach for when you want to serve static assets — files from a Git repo, packages from npm, or other open source artifacts — through a global edge network rather than from your own origin.

When it fits: you have static files or packages already hosted in a Git repository or npm and want faster, distributed delivery without standing up your own CDN.

What to verify before relying on it: the exact URL format for pulling assets, whether there are bandwidth or request limits, and whether the "free" label carries conditions. The upset.dev page itself does not spell these out.

BlobCDN

BlobCDN is described as generating "smooth, customizable SVG blobs instantly from a URL." This is a different kind of CDN-style resource: instead of serving your files, it produces an SVG image on demand based on URL parameters.

When it fits: you need decorative blob shapes for a landing page, avatar placeholder, or design mockup and want them generated programmatically rather than drawn by hand.

What to verify: which parameters control shape, color, and size, and whether the output is deterministic (same URL → same blob) or randomized.

Fonts and privacy

Fonts

Fonts is positioned as "a privacy-friendly Google Fonts alternative" that is "faster, fully EU-compliant, and completely tracking-free." The core value proposition is serving web fonts without the tracking and EU-compliance concerns that come with Google Fonts.

When it fits: you serve users in the EU or otherwise care about avoiding third-party tracking through font requests, and you want a drop-in style alternative to Google Fonts.

What to verify: how you reference the fonts in your CSS (the page does not show the embed pattern), which font families are available, and whether self-hosting or a hosted endpoint is involved. The source code for fonts.upset.dev is listed under Open Source, so you can inspect the implementation if the hosted behavior matters to you.

Favicon and icon APIs

Favicone

Favicone is "an API for instantly fetching favicons from any domain," described as "lightweight and blazing fast." You supply a domain and get back its favicon.

When it fits: you are building a link preview, bookmark manager, dashboard, or directory and need favicons for arbitrary domains without scraping each site yourself.

What to verify: the request format (how the domain is passed), the response type (image redirect vs. binary), fallback behavior when a domain has no favicon, and any rate limits.

Other developer tools on the same page

The Products list is broader than the four resources above. Other entries that may be relevant depending on your task:

Product What it does (per site)
Speedflare Global website monitoring and testing from multiple worldwide locations
Indiwtf Checks whether a website is accessible or blocked in Indonesia in realtime
PureDNS A DNS service aimed at safer browsing in Indonesia
Have I Been MITMed? Detects whether internet traffic is being intercepted or modified
HTTP Check Checks whether a site supports HTTP/2 or HTTP/3
thedev.id A free developer subdomain (yourname.thedev.id)
Onion Domain Generates a custom .onion domain for a Tor hidden service
DNS Profile Generator Builds Apple configuration profiles for DoH and DoT
whoami Shows what the internet knows about you: IP, location, network, browser
edns Shows which DNS resolver your browser uses and whether EDNS Client Subnet leaks your network
DNS Leak Test Exposes DNS servers your connection leaks to
Domain Tools WHOIS and DNS record lookups for any domain
Stak Visualizes Kubernetes manifests and Docker Compose files as a topology map

Several of these (DNS Leak Test, edns, whoami, Have I Been MITMed?) overlap with the DNS-leak and network-exposure question, so if your goal is privacy checking rather than asset delivery, start there instead.

How to choose among them

  • Serving static files or packages globally → Statically.
  • Generating SVG shapes on demand → BlobCDN.
  • Replacing Google Fonts with a tracking-free option → Fonts.
  • Pulling favicons for arbitrary domains → Favicone.
  • Checking DNS leaks or VPN privacy → DNS Leak Test, edns, or whoami, not the CDN/font tools.

The upset.dev page lists these as products and open source projects but does not publish pricing, rate limits, or signup requirements for them. Before integrating any of them into production, open the individual product page or its GitHub repository (the Open Source section links source code, e.g., for fonts.upset.dev) to confirm current terms, limits, and API specifics.