#99BB31
Closest named color: Bright Olive (#9CBB04). oklch(74.2% 0.163 122.7), rgb(153, 187, 49).
Aa
Black text reads best on this color (9.50:1).
About this color
#99BB31 is a medium-light, vivid yellow. In OKLCH its lightness is 74%, its chroma 0.163 and its hue 123°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Bright Olive (#9CBB04), ΔE 0.015 away. Black text reads best on it, at 9.50:1.
| Hue family | Yellows |
| Lightness | medium-light (74%) |
| Chroma | vivid (0.163) |
| Temperature | in between |
| Nearest name | Bright Olive (#9CBB04) |
| Black text | 9.50:1 |
| White text | 2.20:1 |
Values
| HEX | #99BB31 |
| RGB | rgb(153, 187, 49) |
| HSL | hsl(75, 58%, 46%) |
| OKLCH | oklch(74.2% 0.163 122.7) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #99BB31 | 2.20:1 | Fails | Lc -48.1 | Large or bold text, headings |
| Black text on #99BB31 | 9.50:1 | AAA | Lc 60.6 | Content text, not long reading |
| #99BB31 text on white | 2.20:1 | Fails | Lc 43.3 | Non-text elements, placeholder text |
| #99BB31 text on black | 9.50:1 | AAA | Lc -58.8 | Large or bold text, headings |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 400.
-
Step 50
50
#F4F7ED
oklch(97.1% 0.014 120.3)
-
Step 100
100
#E6EDD8
oklch(93.5% 0.029 122)
-
Step 200
200
#D2E0B7
oklch(88.5% 0.057 122.9)
-
Step 300
300
#B4CC81
oklch(81% 0.102 123.1)
-
Step 400
400 (this color)
#99BB31
oklch(74.2% 0.163 122.7)
-
Step 500
500
#799700
oklch(63% 0.154 122.6)
-
Step 600
600
#657F00
oklch(55.6% 0.136 122.8)
-
Step 700
700
#556B00
oklch(49.2% 0.12 122.6)
-
Step 800
800
#455700
oklch(42.6% 0.104 122.4)
-
Step 900
900
#394900
oklch(37.8% 0.092 122.7)
-
Step 950
950
#212B00
oklch(27% 0.066 122.2)
#99BB31 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #C6AF14 | 0.065 |
| Deuteranopia (no green cones) | #C2AE3D | 0.068 |
| Tritanopia (no blue cones) | #A1B1A1 | 0.137 |
| Achromatopsia (no color) | #AEAEAE | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #99BB31
#99BB31
oklch(74.2% 0.163 122.7)
- #C08FFF
#C08FFF
oklch(74.1% 0.163 302.8)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #99BB31, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Olive #9CBB04 ΔE 0.015
- Pea #A4BF20 ΔE 0.020
- Mustard Green #A8B504 ΔE 0.023
- Avocado #90B134 ΔE 0.031
- Dark Lime #84B701 ΔE 0.036
- Icky Green #8FAE22 ΔE 0.039
- Light Olive Green #A4BE5C ΔE 0.040
- Dark Lime Green #7EBD01 ΔE 0.040
Use #99BB31 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.