Spelunky (Boss Fight Books, #11) by Derek Yu
Verified live by HTTP probe across 17 observations. Pulse momentum is positive over 30 days (+32.0).
HTTP liveness
realSignal telemetry
4 families · 2 observed · observed onlybossfightbooks.comedge
behind Cloudflareserver
cloudflareTranco rank
#1,365,776
Analyst read
generated from the observed metrics above · no external narrativeSpelunky (Boss Fight Books, #11) by Derek Yu's listed site resolved live when we last probed it on Aug 26, 2026, so we mark it verified alive. Its Pulse Index is 43.0 of 100, built from 2 of 4 observed signal families. Observed footprint: 6 functional tags. It has no curated competitive-alternative edges yet, so the comparable set below is functional tag-similarity — read it with the confidence flags.
Comparable set
curated alternatives → functional tag-similarity| Company | Basis | Overlap | Pulse | 30d Δ | Status |
|---|---|---|---|---|---|
| PRAE: Vol.1 by Miklós Szentkuthyentertainment | similar | 83% | 40.0 | 0.0 | ● live |
| Gjelina: California Cooking from Venice Beachother | tag-overlap | 83% | 0.0 | 0.0 | ■ inactive |
| What's The Deal with Podcasting?entertainment | similar | 83% | 40.0 | +4.8 | ● live |
| The Power of Thoughteducation | tag-overlap | 71% | 16.0 | 0.0 | → redirected |
| The Moment of Clarityeducation | tag-overlap | 71% | 16.0 | 0.0 | → redirected |
| Art of Learningeducation | tag-overlap | 71% | 40.0 | 0.0 | ● live |
| I, Steve: Steve Jobs In His Own Wordseducation | tag-overlap | 71% | 40.0 | 0.0 | ● live |
| Lean Outeducation | tag-overlap | 67% | 46.5 | 0.0 | ● live |
Confidence reflects source and category coherence: curated = an editorially linked alternative; similar = strong functional tag-overlap in the same category; tag-overlap = shared tags only and may be noisy. Overlap is the shared functional-tag ratio (Jaccard) for tag-matched rows. Pulse is the observed-activity index real and 30d Δ its signed month change; a dash means insufficient observed history, never zero.
Structure
observed attributesFunding & team
not in sourceNo disclosed funding in our sources. Funding data covers only ~1% of the corpus (462 rounds across 79K products), so absence here is unknown, not zero— we don't estimate a number we can't source.