#31799F
Closest named color: Cerulean (#457B9D). oklch(54.8% 0.092 235.1), rgb(49, 121, 159).
Aa
White text reads best on this color (4.80:1).
About this color
#31799F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.092 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.019 away. White text reads best on it, at 4.80:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.36:1 |
| White text | 4.80:1 |
Values
| HEX | #31799F |
| RGB | rgb(49, 121, 159) |
| HSL | hsl(201, 53%, 41%) |
| OKLCH | oklch(54.8% 0.092 235.1) |
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 #31799F | 4.80:1 | AA | Lc -78.5 | Fine for body text |
| Black text on #31799F | 4.36:1 | AA large text | Lc 31.0 | Non-text elements, placeholder text |
| #31799F text on white | 4.80:1 | AA | Lc 73.1 | Content text, not long reading |
| #31799F text on black | 4.36:1 | AA large text | Lc -28.6 | 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
#A8C6D8
oklch(81% 0.041 234.4)
-
Step 400
400
#78A8C4
oklch(70.8% 0.066 234.5)
-
Step 500
500
#5292B6
oklch(63.2% 0.085 235)
-
Step 600
600 (this color)
#31799F
oklch(54.8% 0.092 235.1)
-
Step 700
700
#25688A
oklch(49.1% 0.086 234.7)
-
Step 800
800
#215570
oklch(42.7% 0.071 234.6)
-
Step 900
900
#21465B
oklch(37.7% 0.056 235.7)
-
Step 950
950
#142935
oklch(26.9% 0.035 235.2)
#31799F 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) | #6778A1 | 0.057 |
| Deuteranopia (no green cones) | #586D9E | 0.048 |
| Tritanopia (no blue cones) | #008386 | 0.060 |
| Achromatopsia (no color) | #727272 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31799F
#31799F
oklch(54.8% 0.092 235.1)
- #9A6239
#9A6239
oklch(54.9% 0.092 55.6)
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 #31799F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.019
- Dull Blue #49759C ΔE 0.022
- Muted Blue #3B719F ΔE 0.024
- Flat Blue #3C73A8 ΔE 0.027
- Nice Blue #107AB0 ΔE 0.029
- Stormy Blue #507B9C ΔE 0.030
- Sea Blue #047495 ΔE 0.031
- Ocean #017B92 ΔE 0.032
Use #31799F 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.