Classtra
Observed dead: the site no longer answers as a live product. Pulse momentum is negative over 30 days (-35.2) — observed activity is receding. Observation is liveness-only: no tracked press, repository, or traffic rank — existence is confirmed, momentum is unobserved.
HTTP liveness
realSignal telemetry
4 families · 2 observed · observed onlyclasstra.orgedge
direct originserver
ApacheTranco rank
#3,905,367
Analyst read
generated from the observed metrics above · no external narrativeClasstra's site returned a hard-dead response when we last probed it on Aug 24, 2026, so we mark it inactive. Its Pulse Index is 0.3 of 100, built from 2 of 4 observed signal families. Observed footprint: 9 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 |
|---|---|---|---|---|---|
| Mammothproductivity | tag-overlap | 80% | 40.0 | 0.0 | ● live |
| Dryftaproductivity | tag-overlap | 78% | 44.8 | 0.0 | ● live |
| SchoolConverseducation | similar | 78% | 8.0 | 0.0 | — unverified |
| HuddleUpproductivity | tag-overlap | 73% | 40.0 | 0.0 | ● live |
| AnonymityBot for Slackcommunication | tag-overlap | 73% | 16.0 | 0.0 | → redirected |
| Delibr 2.0productivity | tag-overlap | 73% | 1.7 | 0.0 | ■ inactive |
| Zapmailcommunication | tag-overlap | 73% | 40.0 | 0.0 | ● live |
| Schoologyeducation | similar | 70% | 49.4 | +24.0 | → redirected |
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.