#31455B
Closest named color: Dark Grey Blue (#29465B). oklch(38.3% 0.045 251.4), rgb(49, 69, 91).
Aa
White text reads best on this color (9.84:1).
About this color
#31455B is a dark, muted blue. In OKLCH its lightness is 38%, its chroma 0.045 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.010 away. White text reads best on it, at 9.84:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.13:1 |
| White text | 9.84:1 |
Values
| HEX | #31455B |
| RGB | rgb(49, 69, 91) |
| HSL | hsl(211, 30%, 27%) |
| OKLCH | oklch(38.3% 0.045 251.4) |
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 #31455B | 9.84:1 | AAA | Lc -97.0 | Preferred for body text |
| Black text on #31455B | 2.13:1 | Fails | Lc 11.1 | Not readable |
| #31455B text on white | 9.84:1 | AAA | Lc 92.8 | Preferred for body text |
| #31455B 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EAF0
oklch(93.5% 0.01 252.8)
-
Step 200
200
#D0DAE6
oklch(88.4% 0.02 252.9)
-
Step 300
300
#B1C3D7
oklch(81% 0.035 251)
-
Step 400
400
#88A3C2
oklch(70.6% 0.055 252.1)
-
Step 500
500
#6A8DB3
oklch(63.2% 0.07 251)
-
Step 600
600
#51769F
oklch(55.5% 0.077 251.8)
-
Step 700
700
#426388
oklch(49.1% 0.071 252.1)
-
Step 800
800
#36516E
oklch(42.6% 0.059 251)
-
Step 900
900 (this color)
#31455B
oklch(38.3% 0.045 251.4)
-
Step 950
950
#1C2734
oklch(26.9% 0.029 253)
#31455B 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) | #3C465C | 0.016 |
| Deuteranopia (no green cones) | #37415B | 0.014 |
| Tritanopia (no blue cones) | #214A4C | 0.040 |
| Achromatopsia (no color) | #434343 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31455B
#31455B
oklch(38.3% 0.045 251.4)
- #533F28
#533F28
oklch(38.3% 0.045 69.7)
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 #31455B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.010
- Charcoal #264653 ΔE 0.021
- Charcoal Grey #3C4142 ΔE 0.042
- Dark Slate Gray #2F4F4F ΔE 0.044
- Dark Blue Grey #1F3B4D ΔE 0.046
- Onyx #343A40 ΔE 0.050
- Dark Teal #014D4E ΔE 0.054
- Deep Teal #00555A ΔE 0.059
Use #31455B 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.