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Sumday
Sumday is a daily web game that challenges players to construct a valid mathematical equation using the digits of the current date in sequence
verified Aug 27, 2026 · HTTP 200
CohortClass of 2026What it is
Sumday is a daily web game that challenges players to construct a valid mathematical equation using the digits of the current date in sequence. Unlike conventional word and puzzle games with a single target, any mathematically sound equation is accepted.
HTTP liveness
1 probe since Aug 27Aug 27Aug 27
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Aug 27, 2026First probe — liveAlive · 200 OK
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Pulse Indexobserved activity
1 probe0 pressGitHub –Tranco –
Not enough observed signals for a Pulse Index (needs 2+ signal families).
Cohort survival · Class of 2026weekly
3,100 products launched in 2026 · 100% still active
3,100 active0 sunset
Still active
100%
Median lifespan
4.9y