Command Palette
Search for a command to run...
Send Check It Subject Line Tester
Write better email subjects with this tool — Send Check It is an amazing email subject line analyzer, we here at Contractize are testing our headlines and we are loving it! [Web App, Growth Hacking]
verified Jul 13, 2026 · HTTP 200
CohortClass of 2017What it is
Write better email subjects with this tool — Send Check It is an amazing email subject line analyzer, we here at Contractize are testing our headlines and we are loving it! [Web App, Growth Hacking]
HTTP liveness
14 probes since Jun 11Jun 11Jul 13
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jun 11, 2026First probe — liveAlive · 200 OK
Discussion 0 comments
No comments yet. Be the first!
Pulse Indexobserved activity
14 probes0 pressGitHub –Tranco –
Not enough observed signals for a Pulse Index (needs 2+ signal families).
Cohort survival · Class of 2017weekly
13,497 products launched in 2017 · 100% still active
13,462 active35 sunset
Still active
100%
Median lifespan
4.9y