221 API vs CollegeCalcAI API

Two free Open Data APIs compared on access, reliability and developer ratings, using data from our daily health checks.

The verdict

Choose 221 API if its data fits your use case better; on access and reliability it's level with CollegeCalcAI API.
Choose CollegeCalcAI API if its data fits your use case better; on access and reliability it's level with 221 API.

	221 API	CollegeCalcAI API
What it does	Senegal reference data: public holidays, mobile operators, banks, communes, legal forms.	US college admission chance estimates and admissions data for 1,100+ colleges.
Provider	221	CollegeCalcAI
API key	Not needed	Not needed
HTTPS	Yes	Yes
CORS (browser calls)	Yes	Yes
Status today	Online · 527 ms	Online · 531 ms
Uptime (30 days)	Up	Up
Developer rating	Not rated yet	Not rated yet
Price	Free / free tier	Free / free tier

Senegal reference data: public holidays, mobile operators, banks, communes, legal forms.

L'API 221 et ses SDK en un coup d'œil. Trouvez une route, obtenez une clé, faites un premier appel, puis choisissez un SDK.

Strengths

US college admission chance estimates and admissions data for 1,100+ colleges.

College admission chances for AI assistants. Remote MCP server, keyless, 1,100+ U.S. colleges.

Strengths

Prototyping or a tutorial? Pick the one that needs no API key (both qualify).
Calling from a web page? You need CORS. Otherwise route requests through your own server or a serverless function.
Going to production? Favour HTTPS, a strong uptime record and a provider with clear rate limits and terms. Check each API's docs before you commit.
Still unsure? Both are free to try: send one request to each and compare the data you get back.