PullPush is a second independent Reddit archive and search service, free and unauthenticated, with its own collection methods and coverage.
Why have two
Two archives collecting the same site at different times will hold different things. One may have a post the other missed. Where they disagree, the disagreement is information about coverage rather than an error to resolve.
Why it may show as unavailable
Subdex runs entirely in your browser. A browser will only contact another site if that site permits it through CORS headers. If PullPush does not permit browser requests from this application, the integration cannot work in a browser-only tool.
Where that is the case, Subdex disables it and says so, rather than showing a control that silently fails.
How disagreements are handled
When both providers return the same record, they merge into one entry carrying both sources. Where a field differs — a score, most often — both values are kept and the conflict is recorded. Neither source is treated as authoritative.