Every OpenAlex search stores its request, response and checksums so sources can be checked later.
Free
One server, in research. Every OpenAlex search stores its request, response and checksums so sources can be checked later.
Research
Every OpenAlex search stores its request, response and checksums so sources can be checked later.
The rest either hold an API key issued by the publisher or ask for nothing.
Listed without a verification tick. Read the listing before installing.