#C1E613Sour Green (#C1E613) is a very light, vivid yellow-green with an OKLCH hue of 121°, lightness 0.87 and chroma 0.205. It sits on the transitional side of the color wheel. In practice it behaves as a mid-weight working color for secondary surfaces and editorial blocks.
| HEX | #C1E613 |
|---|---|
| RGB | rgb(193, 230, 19) |
| HSL | hsl(71, 85%, 49%) |
| HSV | hsv(71, 92%, 90%) |
| CMYK | cmyk(16%, 0%, 92%, 10%) |
| CIE Lab | lab(86 -34.9 82.5) |
| OKLCH | oklch(0.867 0.205 121) |
Under warm 2700K interior light Sour Green shifts subtly: leans toward yellow; in north-facing or shaded light it is virtually unchanged. Overall drift across common illuminants is small (max ΔE ≈ 1.8), so it is a lighting-stable choice.
#cbe000 — ΔE 1.8, shifts subtly: leans toward yellow#c9e700 — ΔE 1.1, shifts subtly: leans toward yellow#c1e613 — ΔE 0.0, is virtually unchanged#c1e718 — ΔE 0.3, is virtually unchangedTest Sour Green in the color lighting simulator — sweep it through daylight, warm 2700K light, 4000K LED, and shade alongside the rest of your palette.
Against white it measures 1.44:1 and against black 14.6:1, so black text is the stronger pairing. That pairing passes WCAG AA for body text. Avoid white text on this color entirely.
One color explored: close hues with real lightness and chroma structure, so the palette is the anchor through value rather than a set of colors.
#e5ff9e · #c1e613 · #94b100 · #718800 · #516200 · #323e00
The anchor's neighbours on the wheel — everything shares an undertone, so the chord carries color without anything having to be muted to get along.
#adf98c · #c1e613 · #d2c500 · #d4a600 · #d18900 · #cb6b00
The mid-gap pairing — sage and mustard, terracotta and olive. A foil rotated 40–65° toward warm or cool: too far to be kin, too near to argue, carried by temperature and a deliberate value offset.
#c1e613 · #66c9ad · #87a200 · #008b70 · #516300 · #004b3b
One deliberately opposed voice — a single restrained counterpoint across the wheel, or temperature against temperature where the anchor is too muted to carry a loud opposite.
#c1e613 · #aab78b · #894ad5 · #475700 · #2d3800 · #141b00
The anchor as the only color in the room. True neutrals or complement-warmed near-neutrals let it stay dominant.
#c1e613 · #b9b3c7 · #7c8468 · #4f4a57 · #1c2205 · #020005
This color as a ground rather than a subject — its own restraint held across a narrow value band, carrying one saturated voice from the opposite temperature.
#f3f0fb · #cbc6d3 · #9e99a8 · #251f30 · #05010d · #c1e613
The opposite hue on the perceptual wheel, tempered to field strength — warm/cool tension without vibration.
#c8f9f9 · #c1e613 · #96d194 · #f033d6 · #3f3e69 · #1d0508
The complement's two neighbours instead of the complement itself — strong contrast with a lower clash risk.
#dff0ff · #c1e613 · #adbee3 · #974d99 · #384162 · #140f04
Three hues spaced evenly around the wheel; the anchor leads and the other two are held at supporting strength.
#c1e613 · #94bcdb · #0088ca · #8e0047 · #40001c · #000510
Two complementary pairs offset by 90° — the richest chord, kept usable by a strict lightness hierarchy.
#c1e613 · #88c2cd · #0090a2 · #6316a7 · #430000 · #050012
#C8EA4F · #D0EE70 · #D7F28B · #DFF5A4 · #E7F9BB
#9DBC00 · #7A9300 · #596C00 · #3B4800 · #1E2600
#C4E35F · #C8DF85 · #CCDBA5
Its moderate chroma lets it work in mid-size areas — upholstery, secondary UI surfaces, editorial blocks — without overwhelming neighbors. In palettes it pairs most predictably with its tonal ramp and analogous neighbors; reserve the complementary hue for small, deliberate contrast.