Observed arrival · 2026-10-21
NumFoundry’s three calculators show their work
NumFoundry offers focused calculators for municipal-bond tax yield, RAID 10 storage, and machining speeds and feed rates.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Bond investors, RAID planners, and machinists
- Worth noticing
- The tax-yield tool says it handles state and local tax plus an itemized-deduction case the homepage says many calculators skip.
Field notes
The homepage frames the three calculators around cases where an unexplained answer can have consequences: rejecting a better bond, designing an array with misunderstood failure tolerance, or wearing out a cutting edge. It says each tool presents its formula and assumptions, then identifies situations where the result may mislead. The machining calculator also lists a material-based cutting-speed reference.
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
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