Head to head

Stop guessing which one. Put them side by side.

Up to 4 tools, same rows for each: what it is, what it really costs, the trap, and how to wire it up. The URL carries your picks — send it to anyone.

WhoCanUseFontshareGoogle Fonts

Field	WhoCanUsewhocanuse.com	Fontsharefontshare.com	Google Fontsfonts.google.com
What it is	Contrast checker that goes past the WCAG ratio. Enter a foreground and background pair and it simulates that combination through red-blindness, green-blindness, blue-yellow confusion and full colour blindness, plus cataracts, glaucoma, low vision, direct sunlight and night-shift filters. Built by Corey Ginnivan.	Free font service from the Indian Type Foundry offering a small, tightly curated set of contemporary families — Satoshi, General Sans, Clash Display, Cabinet Grotesk and similar — many with variable versions. Serve from their CDN or download the files and self-host.	Library of open-source typefaces, almost all under the SIL Open Font License 1.1 with a handful under Apache 2.0. Serve them from Google's CDN, self-host the files, or bundle them into a native app. Includes variable fonts and the Material Symbols icon set.
Category	Design tools, color & type	Design tools, color & type	Design tools, color & type
Cost tier	free	free	free
Pricing	Free · open source	Free	Free
Why builders pick it	It shows you the failure instead of a number, which is what actually changes your mind about a low-contrast grey. Useful for defending a colour choice to a client, or for killing your own.	The quickest way to stop looking like every other Google Fonts site. A handful of these faces read as expensive typography while costing nothing, which is exactly the trade a solo builder wants.	Zero-cost, zero-friction type that is legally safe in commercial products, including ones you sell. Self-hosting a subset via Fontsource or next/font also kills a render-blocking third-party request.
Watch out for	It checks one colour pair at a time, so it complements rather than replaces a whole-page automated audit like axe or Lighthouse.	The ITF licence covers personal and commercial use and embedding in sites and apps, but you may not resell or redistribute the font files themselves. Check the terms per family — some are free cuts of larger paid families.	Serving from Google's CDN sends visitor IP addresses to Google, which a German court ruled a GDPR violation — self-host the files if you have EU traffic. The OFL also bars selling the font files on their own and reserves certain names for modified versions.
How to wire it up	not logged	not logged	npm i @fontsource/inter, or import from next/font/google
Editor's pick	No	No	No

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# Tool comparison — WhoCanUse vs Fontshare vs Google Fonts

Source: Kbaise, a directory of tools that work with Lovable projects.
Pick one and tell me why before writing any integration code.

## WhoCanUse (whocanuse)
- URL: https://whocanuse.com
- Category: Design tools, color & type
- Cost: free — Free · open source
- What it is: Contrast checker that goes past the WCAG ratio. Enter a foreground and background pair and it simulates that combination through red-blindness, green-blindness, blue-yellow confusion and full colour blindness, plus cataracts, glaucoma, low vision, direct sunlight and night-shift filters. Built by Corey Ginnivan.
- Why builders pick it: It shows you the failure instead of a number, which is what actually changes your mind about a low-contrast grey. Useful for defending a colour choice to a client, or for killing your own.
- Trap: It checks one colour pair at a time, so it complements rather than replaces a whole-page automated audit like axe or Lighthouse.
- Full dossier: /api/public/tools/whocanuse

## Fontshare (fontshare)
- URL: https://www.fontshare.com
- Category: Design tools, color & type
- Cost: free — Free
- What it is: Free font service from the Indian Type Foundry offering a small, tightly curated set of contemporary families — Satoshi, General Sans, Clash Display, Cabinet Grotesk and similar — many with variable versions. Serve from their CDN or download the files and self-host.
- Why builders pick it: The quickest way to stop looking like every other Google Fonts site. A handful of these faces read as expensive typography while costing nothing, which is exactly the trade a solo builder wants.
- Trap: The ITF licence covers personal and commercial use and embedding in sites and apps, but you may not resell or redistribute the font files themselves. Check the terms per family — some are free cuts of larger paid families.
- Full dossier: /api/public/tools/fontshare

## Google Fonts (google-fonts)
- URL: https://fonts.google.com
- Category: Design tools, color & type
- Cost: free — Free
- What it is: Library of open-source typefaces, almost all under the SIL Open Font License 1.1 with a handful under Apache 2.0. Serve them from Google's CDN, self-host the files, or bundle them into a native app. Includes variable fonts and the Material Symbols icon set.
- Why builders pick it: Zero-cost, zero-friction type that is legally safe in commercial products, including ones you sell. Self-hosting a subset via Fontsource or next/font also kills a render-blocking third-party request.
- Trap: Serving from Google's CDN sends visitor IP addresses to Google, which a German court ruled a GDPR violation — self-host the files if you have EU traffic. The OFL also bars selling the font files on their own and reserves certain names for modified versions.
- Wiring: npm i @fontsource/inter, or import from next/font/google
- Full dossier: /api/public/tools/google-fonts

## Rules
1. Prefer the free tier when no budget was stated, and say what the ceiling is.
2. Read the full dossier before integrating.
3. Fetch /api/public/models before writing any AI model ID.

Agents can fetch the same thing: GET /api/public/compare?slugs=whocanuse,fontshare,google-fonts