#B1B601
Closest named color: Mustard Green (#A8B504). oklch(74.7% 0.165 111.8), rgb(177, 182, 1).
Aa
Black text reads best on this color (9.56:1).
About this color
#B1B601 is a medium-light, vivid yellow. In OKLCH its lightness is 75%, its chroma 0.165 and its hue 112°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Mustard Green (#A8B504), ΔE 0.013 away. Black text reads best on it, at 9.56:1.
| Hue family | Yellows |
| Lightness | medium-light (75%) |
| Chroma | vivid (0.165) |
| Temperature | in between |
| Nearest name | Mustard Green (#A8B504) |
| Black text | 9.56:1 |
| White text | 2.19:1 |
Values
| HEX | #B1B601 |
| RGB | rgb(177, 182, 1) |
| HSL | hsl(62, 99%, 36%) |
| OKLCH | oklch(74.7% 0.165 111.8) |
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 #B1B601 | 2.19:1 | Fails | Lc -47.8 | Large or bold text, headings |
| Black text on #B1B601 | 9.56:1 | AAA | Lc 60.9 | Content text, not long reading |
| #B1B601 text on white | 2.19:1 | Fails | Lc 43.0 | Non-text elements, placeholder text |
| #B1B601 text on black | 9.56:1 | AAA | Lc -59.2 | 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
#F5F7EC
oklch(97.2% 0.015 115)
-
Step 100
100
#EAECD6
oklch(93.6% 0.029 111.2)
-
Step 200
200
#DADDB2
oklch(88.4% 0.057 110.8)
-
Step 300
300
#C2C777
oklch(80.8% 0.103 111.6)
-
Step 400
400 (this color)
#B1B601
oklch(74.7% 0.165 111.8)
-
Step 500
500
#8D9100
oklch(63.2% 0.14 111.7)
-
Step 600
600
#767900
oklch(55.5% 0.122 111.5)
-
Step 700
700
#636600
oklch(49.1% 0.109 111.8)
-
Step 800
800
#515300
oklch(42.6% 0.094 111.4)
-
Step 900
900
#434500
oklch(37.6% 0.083 111.6)
-
Step 950
950
#272900
oklch(27% 0.06 112.6)
#B1B601 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) | #C5AD00 | 0.036 |
| Deuteranopia (no green cones) | #C6B121 | 0.036 |
| Tritanopia (no blue cones) | #BEAA9B | 0.148 |
| Achromatopsia (no color) | #AFAFAF | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B1B601
#B1B601
oklch(74.7% 0.165 111.8)
- #AF9BFF
#AF9BFF
oklch(74.7% 0.142 291.8)
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 #B1B601, closest first.
No curated palette has a color within ΔE 0.04 of #B1B601.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mustard Green #A8B504 ΔE 0.013
- Olive Yellow #C2B709 ΔE 0.026
- Pea #A4BF20 ΔE 0.026
- Bright Olive #9CBB04 ΔE 0.030
- Muddy Yellow #BFAC05 ΔE 0.032
- Mustard #CEB301 ΔE 0.043
- Light Olive Green #A4BE5C ΔE 0.047
- Avocado #90B134 ΔE 0.049
Use #B1B601 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.