{ }
Development
Software and data calculations.
{ }open →
Unix Timestamp Converter
What date is this Unix timestamp — or what timestamp is this date?
epoch + t seconds
{ }open →
IPv4 Subnet Calculator (CIDR)
What are the network, broadcast, host range and mask for this CIDR block?
ip AND mask
{ }open →
Color Contrast Ratio Checker (WCAG)
Does this text and background color pair pass WCAG AA or AAA contrast?
(L₁ + 0.05)/(L₂ + 0.05)