Observed arrival · 2026-10-01
Zero Mile Instruments measures tempo, pitch—and email trouble
A free suite of tools for tapping out a song’s tempo, testing pitch perception, and checking why a domain’s email may bounce or land in spam.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- People checking tempo or pitch, and domain owners diagnosing email trouble
- Worth noticing
- The mail check says it does not record the domain entered; full access logs, including IP addresses, are deleted after seven days.
Field notes
The two music tools run on the visitor’s device; the mail checker uses the site’s server and returns plain-language verdicts alongside the underlying records. The page says it keeps full access logs, including IP addresses, for seven days, while not recording the domain entered into Mail check. A tuner is listed as next; stopwatch, reaction-time, and refresh-rate tools are described only as ideas under consideration.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue