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PDF Studio Viewer - PDF Annotator
A lightweight PDF reader enabling users to annotate documents and complete interactive forms across Windows, Mac, and Linux
verified Jul 12, 2026 · HTTP 200
CohortClass of 2026What it is
A lightweight PDF reader enabling users to annotate documents and complete interactive forms across Windows, Mac, and Linux. Built by Qoppa Software as the free tier of their PDF Studio suite, offering essential viewing and markup capabilities without cost.
HTTP liveness
9 probes since Jun 16Jun 16Jul 12
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jun 16, 2026First probe — liveAlive · 200 OK
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Pulse Indexobserved activity
9 probes0 pressGitHub –Tranco –
Not enough observed signals for a Pulse Index (needs 2+ signal families).
Cohort survival · Class of 2026weekly
567 products launched in 2026 · 100% still active
567 active0 sunset
Still active
100%
Median lifespan
4.9y