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SONAR - An Email Tracker for Gmail
SONAR is a Gmail extension that reveals when recipients open your emails, enabling data-driven follow-up decisions
last checked Jul 13, 2026 · Timeout
CohortClass of 2026What it is
SONAR is a Gmail extension that reveals when recipients open your emails, enabling data-driven follow-up decisions. Receive instant web-push notifications upon email opens to help you optimize your outreach timing and strategy.
HTTP liveness
9 probes since Jun 16Jun 16Jul 13
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jul 13, 2026Probe inconclusiveTimeout
- 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