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Circl
Circl is a wearable headset that tracks and measures mental performance, helping users identify peak cognitive periods and optimize their mental sharpness
since Jun 16, 2026 · HTTP 404
CohortClass of 2026What it is
Circl is a wearable headset that tracks and measures mental performance, helping users identify peak cognitive periods and optimize their mental sharpness. By monitoring how cognitive ability changes over time, it reveals patterns about when you perform best and what interventions enhance focus and mental clarity.
HTTP liveness
9 probes since Jun 16Jun 16Jul 13
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jun 16, 2026First probe — downDead · 404
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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
550 products launched in 2026 · 100% still active
550 active0 sunset
Still active
100%
Median lifespan
4.9y