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Numbers API alternatives

Number of the day, random number, number facts and anything else you want to do with numbers. If it doesn't fit your project, here are the 10 best free Science & Math APIs to use instead in 2026, out of 58 in the directory.

For reference, Numbers API: HTTPS.

1
GBIF API
Online · 115 ms
Global Biodiversity Information Facility. A free science & math API by gbif.org.
- No API key needed
- Fast: 115 ms response
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
2
Macrostrat API
Online · 694 ms
Geologic maps, rock columns and stratigraphy data.
- No API key needed
- Returns JSON at its URL
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
3
Chempirical API
Online · 533 ms
Chemical compounds with physical data, reactions and substructure search.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
4
CycleCalcs API
Online · 714 ms
Interpreted astronomy: sun and moon times, moon phases, planets, eclipses, seasons.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
5
Europe PMC API
Online · 118 ms
Life-science literature search with abstracts, citations and full-text links.
- No API key needed
- Fast: 118 ms response
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
6
iNaturalist API
Online · 1121 ms
Citizen-science wildlife observations with species identification and mapping.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
7
Launch Library 2 API
Online · 876 ms
Spaceflight launches and events database.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
8
MathJS API
Online · 934 ms
Evaluate math expressions via GET or POST as JSON.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
9
Oliver's mTOR Atlas API
Online · 739 ms
Curated mTOR research: studies by evidence type, pathway claims, open questions.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
10
OpenAlex API
Online · 864 ms
Open catalog of scholarly works, authors, institutions, sources, and concepts.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS

Numbers API vs alternatives

Numbers API compared with its alternatives
API	API key	HTTPS	CORS	Uptime	Response	Rating
$Numbers logo$ Numbers	Required	Yes	No	Up	1997 ms	Not rated
GBIF	No	Yes	Yes	Up	115 ms	Not rated
Macrostrat	No	Yes	Yes	Up	694 ms	Not rated
Chempirical	No	Yes	Yes	Up	533 ms	Not rated
CycleCalcs	No	Yes	Yes	Up	714 ms	Not rated
Europe PMC	No	Yes	Yes	Up	118 ms	Not rated
iNaturalist	No	Yes	Yes	Up	1121 ms	Not rated
Launch Library 2	No	Yes	Yes	Up	876 ms	Not rated
MathJS	No	Yes	Yes	Up	934 ms	Not rated

Numbers API alternatives FAQ

What is the best free alternative to the Numbers API in 2026?

The top-ranked free alternatives to the Numbers API are GBIF API, Macrostrat API and Chempirical API, all in the Science & Math category. Rankings combine access (API key, HTTPS, CORS), daily uptime checks and developer ratings.

Is there a Numbers API alternative that doesn't need an API key?

Yes: GBIF API, Macrostrat API and Chempirical API work without an API key, unlike the Numbers API, which uses apiKey authentication.

Is there a Numbers API alternative I can call from the browser?

GBIF API, Macrostrat API and Chempirical API support CORS, so front-end JavaScript can call them directly.

How many Science & Math APIs are similar to the Numbers API?

The directory lists 58 other free Science & Math APIs. This page compares the top ones side by side.