Molicheck
Anonymous JSON lab/GMP calculators (molarity, dilution, ICH limits); no API key
Science & Math · No auth · HTTPS
Science & Math APIs
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Ordered by reported HTTPS, CORS support, no-auth access, then changed/observed facts. Access signals are not a popularity or quality score.
Toolalize
Unit and live currency conversion with NIST SI factors, no key needed
Science & Math · No auth · HTTPS
ENA
Nucleotide sequences, genomes and raw reads archive
Science & Math · No auth · HTTPS
Macrostrat
Geologic maps, rock columns and stratigraphy data
Science & Math · No auth · HTTPS
MathJS
Evaluate math expressions via GET or POST as JSON
Science & Math · No auth · HTTPS
NCBI E-utilities
Biomedical literature, sequences and gene databases
Science & Math · No auth · HTTPS
OBIS
Global marine species occurrence and distribution data
Science & Math · No auth · HTTPS
Chempirical
Chemical compounds with physical data, reactions and substructure search
Science & Math · No auth · HTTPS
iNaturalist
Citizen-science wildlife observations with species identification and mapping
Science & Math · No auth · HTTPS
Oliver's mTOR Atlas
Curated mTOR research: studies by evidence type, pathway claims, open questions
Science & Math · No auth · HTTPS
Botlero
Sourced, quoted specs for humanoid robots
Science & Math · No auth · HTTPS
DataCite
Search and retrieve DOI metadata for research datasets and publications
Science & Math · No auth · HTTPS
Unpaywall
Open-access status and legal full-text links for scholarly articles
Science & Math · No auth · HTTPS
Solar System OpenData
Data and facts on solar system bodies and planets
Science & Math · No auth · HTTPS
GBIF
Global Biodiversity Information Facility
Science & Math · No auth · HTTPS
Unusual Units Converter
Unit converter for standard and uncommon units
Science & Math · No auth · HTTPS
CycleCalcs
Interpreted astronomy: sun and moon times, moon phases, planets, eclipses, seasons
Science & Math · No auth · HTTPS
Europe PMC
Life-science literature search with abstracts, citations and full-text links
Science & Math · No auth · HTTPS
GBIF
Global Biodiversity Information Facility
Science & Math · No auth · HTTPS
Launch Library 2
Spaceflight launches and events database
Science & Math · No auth · HTTPS
MyGene.info
Gene annotation queries and ID lookup
Science & Math · No auth · HTTPS
OpenAlex
Open catalog of scholarly works, authors, institutions, sources, and concepts
Science & Math · No auth · HTTPS
RCSB PDB
3D structures of proteins and nucleic acids
Science & Math · No auth · HTTPS
Remote Calc
Decodes base64 encoding and parses it to return a solution to the calculation in JSON
Science & Math · No auth · HTTPS