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Basic Calculations
A lightweight app designed to strengthen mental arithmetic skills across addition, subtraction, multiplication, and division
verified Jul 13, 2026 · HTTP 200
CohortClass of 2026What it is
A lightweight app designed to strengthen mental arithmetic skills across addition, subtraction, multiplication, and division. Works entirely offline and includes document scanning capabilities to export results as PDFs.
HTTP liveness
9 probes since Jun 16Jun 16Jul 13
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jun 20, 2026Back onlineAlive · 200 OK
- Jun 19, 2026Probe inconclusiveUnknown
- 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