#31618E
Closest named color: Denim (#3B638C). oklch(48% 0.09 248.8), rgb(49, 97, 142).
Aa
White text reads best on this color (6.49:1).
About this color
#31618E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.090 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.013 away. White text reads best on it, at 6.49:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.23:1 |
| White text | 6.49:1 |
Values
| HEX | #31618E |
| RGB | rgb(49, 97, 142) |
| HSL | hsl(209, 49%, 37%) |
| OKLCH | oklch(48% 0.09 248.8) |
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 #31618E | 6.49:1 | AA | Lc -87.1 | Fine for body text |
| Black text on #31618E | 3.23:1 | AA large text | Lc 22.0 | Dividers and decoration only |
| #31618E text on white | 6.49:1 | AA | Lc 82.0 | Fine for body text |
| #31618E text on black | 3.23:1 | AA large text | Lc -19.9 | 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 700.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E4EBF2
oklch(93.7% 0.012 248)
-
Step 200
200
#CDDBE9
oklch(88.5% 0.025 248.1)
-
Step 300
300
#ACC4DC
oklch(81% 0.043 248.4)
-
Step 400
400
#7FA5CB
oklch(70.8% 0.07 248.8)
-
Step 500
500
#5D8EBD
oklch(63.1% 0.089 248.4)
-
Step 600
600
#4377A9
oklch(55.5% 0.096 249.1)
-
Step 700
700 (this color)
#31618E
oklch(48% 0.09 248.8)
-
Step 800
800
#2C5276
oklch(42.8% 0.074 248.8)
-
Step 900
900
#28445F
oklch(37.7% 0.058 248.7)
-
Step 950
950
#182838
oklch(27.1% 0.037 249.3)
#31618E 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) | #4D6390 | 0.033 |
| Deuteranopia (no green cones) | #415A8D | 0.024 |
| Tritanopia (no blue cones) | #006C71 | 0.071 |
| Achromatopsia (no color) | #5E5E5E | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31618E
#31618E
oklch(48% 0.09 248.8)
- #7E531C
#7E531C
oklch(48% 0.09 68.8)
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 #31618E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.013
- Denim Blue #3B5B92 ΔE 0.022
- Light Navy Blue #2E5A88 ΔE 0.022
- Peacock Blue #016795 ΔE 0.027
- Dusky Blue #475F94 ΔE 0.027
- YInMn Blue #415A77 ΔE 0.039
- Dusk Blue #26538D ΔE 0.045
- Dusk #4E5481 ΔE 0.047
Use #31618E 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.