It's an old project, based on Sphinx[0]. But unlike many other code searches, this one indexes Codeberg, SourceHut, and a number of other forges non-GitHub forges.

[0]: https://sphinxsearch.com/

without saying what repos they prioritize, it's hard to take them seriously since some pretty simple searches were "uh-huh"

e.g. https://searchcode.com/?q=kubelet&src=2&lan=55 versus https://codesearch.debian.net/search?q=kubelet&literal=1 or the gold standard (although regrettably no longer open source) https://sourcegraph.com/search?q=context:global+kubelet&patt...