#31455D
Closest named color: Dark Grey Blue (#29465B). oklch(38.4% 0.048 253.5), rgb(49, 69, 93).
Aa
White text reads best on this color (9.81:1).
About this color
#31455D is a dark, muted blue. In OKLCH its lightness is 38%, its chroma 0.048 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.011 away. White text reads best on it, at 9.81:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.13:1 |
| White text | 9.81:1 |
Values
| HEX | #31455D |
| RGB | rgb(49, 69, 93) |
| HSL | hsl(213, 31%, 28%) |
| OKLCH | oklch(38.4% 0.048 253.5) |
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 #31455D | 9.81:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #31455D | 2.13:1 | Fails | Lc 11.2 | Not readable |
| #31455D text on white | 9.81:1 | AAA | Lc 92.7 | Preferred for body text |
| #31455D text on black | 2.13:1 | Fails | Lc -9.7 | Not readable |
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 900.
-
Step 50
50
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF1
oklch(93.5% 0.011 256.7)
-
Step 200
200
#D0DAE7
oklch(88.5% 0.021 254.9)
-
Step 300
300
#B1C2D8
oklch(80.8% 0.036 254.9)
-
Step 400
400
#88A3C5
oklch(70.7% 0.058 254.4)
-
Step 500
500
#6A8CB6
oklch(63.1% 0.074 254.1)
-
Step 600
600
#5176A2
oklch(55.7% 0.081 253.4)
-
Step 700
700
#41638A
oklch(49.1% 0.074 252.7)
-
Step 800
800
#365170
oklch(42.7% 0.061 252.6)
-
Step 900
900 (this color)
#31455D
oklch(38.4% 0.048 253.5)
-
Step 950
950
#1C2735
oklch(26.9% 0.03 254.7)
#31455D 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) | #3C465E | 0.016 |
| Deuteranopia (no green cones) | #37425D | 0.012 |
| Tritanopia (no blue cones) | #204A4D | 0.042 |
| Achromatopsia (no color) | #444444 | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31455D
#31455D
oklch(38.4% 0.048 253.5)
- #534025
#534025
oklch(38.5% 0.049 75.2)
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 #31455D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.011
- Charcoal #264653 ΔE 0.024
- Charcoal Grey #3C4142 ΔE 0.046
- Dark Slate Gray #2F4F4F ΔE 0.046
- Dark Blue Grey #1F3B4D ΔE 0.047
- Onyx #343A40 ΔE 0.053
- Dark Teal #014D4E ΔE 0.056
- Prussian Blue #1D3557 ΔE 0.060
Use #31455D 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.