#31789C
Closest named color: Cerulean (#457B9D). oklch(54.4% 0.09 234), rgb(49, 120, 156).
Aa
White text reads best on this color (4.88:1).
About this color
#31789C is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.090 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.021 away. White text reads best on it, at 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.29:1 |
| White text | 4.88:1 |
Values
| HEX | #31789C |
| RGB | rgb(49, 120, 156) |
| HSL | hsl(200, 52%, 40%) |
| OKLCH | oklch(54.4% 0.09 234) |
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 #31789C | 4.88:1 | AA | Lc -79.0 | Fine for body text |
| Black text on #31789C | 4.29:1 | AA large text | Lc 30.5 | Non-text elements, placeholder text |
| #31789C text on white | 4.88:1 | AA | Lc 73.6 | Content text, not long reading |
| #31789C text on black | 4.29:1 | AA large text | Lc -28.1 | Dividers and decoration only |
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 600.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CBDCE6
oklch(88.5% 0.023 233.4)
-
Step 300
300
#A8C6D7
oklch(81% 0.04 232.8)
-
Step 400
400
#78A8C3
oklch(70.7% 0.065 233.5)
-
Step 500
500
#5392B4
oklch(63.1% 0.083 233.8)
-
Step 600
600 (this color)
#31789C
oklch(54.4% 0.09 234)
-
Step 700
700
#276889
oklch(49.1% 0.084 234.4)
-
Step 800
800
#22556F
oklch(42.7% 0.069 233.9)
-
Step 900
900
#21465A
oklch(37.6% 0.054 234.4)
-
Step 950
950
#142935
oklch(26.9% 0.035 235.2)
#31789C 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) | #67779E | 0.058 |
| Deuteranopia (no green cones) | #586C9B | 0.049 |
| Tritanopia (no blue cones) | #008284 | 0.059 |
| Achromatopsia (no color) | #717171 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31789C
#31789C
oklch(54.4% 0.09 234)
- #98613B
#98613B
oklch(54.4% 0.089 54.3)
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 #31789C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.021
- Dull Blue #49759C ΔE 0.022
- Muted Blue #3B719F ΔE 0.023
- Sea Blue #047495 ΔE 0.027
- Flat Blue #3C73A8 ΔE 0.028
- Ocean #017B92 ΔE 0.029
- Stormy Blue #507B9C ΔE 0.031
- Ocean Blue #03719C ΔE 0.032
Use #31789C 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.