Furious Frog
#55ee00
Deep, saturated frog-green for confident midtone UI blocks
About Furious Frog
Furious Frog reads like a hot neon leaf that's just slightly too saturated to feel friendly. It's greener than Becquerel, with none of that "tired" middle-ground softness, and it stays more alive than Alarming Slime without tipping into Cathode Green's cooler, more terminal-like bite. The undertone is distinctly yellow-leaning, but it's clean and punchy, not muddy.
I use it when the UI needs a confident state, not a warning, and not a technical signal. Think active gameplay HUDs, bright product callouts, and live data moments in media players or sports dashboards where you want the eye to lock on immediately. It's also great for packaging and motion graphics that need the green to show up on both dark and lightly tinted backgrounds.
Quirk: because it's so assertive, it can overpower muted palettes fast. I usually balance it with deep charcoal, off-black, or a calm mint, so it stays the headline, not the whole poster.
Code snippets
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Contrast checker
WCAG 2.1 contrast ratios. AA requires 4.5:1 for normal text, 3:1 for large. AAA requires 7:1 / 4.5:1.
On White #ffffff
On Gray 100 #f5f5f5
On Gray 900 #18181b
On Black #000000
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