The project does not seems to state clearly how the detection is made, does it call an external webservice or does it rely on a offline database created at some time?
shameless plug https://github.com/allan-simon/Tatodetect
it covers 179 language (actually as much as Tatoeba project does) and it can run offline with explanation on how to generate your own database from a CC-by corpus.
After the advantage of Franc is that it can be used directly as a npm library while Tatodetect is a micro-webservice, and for some edge languages, Tatodetect is certainly not as good as Franc (haven't done yet a test of both to compare)
shameless plug https://github.com/allan-simon/Tatodetect it covers 179 language (actually as much as Tatoeba project does) and it can run offline with explanation on how to generate your own database from a CC-by corpus.
After the advantage of Franc is that it can be used directly as a npm library while Tatodetect is a micro-webservice, and for some edge languages, Tatodetect is certainly not as good as Franc (haven't done yet a test of both to compare)