#313E75
Closest named color: Twilight Blue (#0A437A). oklch(38.2% 0.095 271.3), rgb(49, 62, 117).
Aa
White text reads best on this color (10.11:1).
About this color
#313E75 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.095 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.035 away. White text reads best on it, at 10.11:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.07:1 |
| White text | 10.11:1 |
Values
| HEX | #313E75 |
| RGB | rgb(49, 62, 117) |
| HSL | hsl(229, 41%, 33%) |
| OKLCH | oklch(38.2% 0.095 271.3) |
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 #313E75 | 10.11:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #313E75 | 2.07:1 | Fails | Lc 10.6 | Not readable |
| #313E75 text on white | 10.11:1 | AAA | Lc 93.3 | Preferred for body text |
| #313E75 text on black | 2.07:1 | Fails | Lc -9.2 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#CFD8F4
oklch(88.4% 0.04 271.4)
-
Step 300
300
#B0BFEF
oklch(81% 0.07 271.2)
-
Step 400
400
#879CE8
oklch(70.7% 0.114 271.5)
-
Step 500
500
#6A82E1
oklch(63.2% 0.145 271.1)
-
Step 600
600
#5369CF
oklch(55.6% 0.159 271.2)
-
Step 700
700
#4457B3
oklch(49.2% 0.147 271.3)
-
Step 800
800
#384791
oklch(42.6% 0.123 271.7)
-
Step 900
900 (this color)
#313E75
oklch(38.2% 0.095 271.3)
-
Step 950
950
#1C2444
oklch(27.1% 0.06 271.3)
#313E75 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) | #264577 | 0.022 |
| Deuteranopia (no green cones) | #1D3F74 | 0.023 |
| Tritanopia (no blue cones) | #0A4A53 | 0.085 |
| Achromatopsia (no color) | #424242 | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313E75
#313E75
oklch(38.2% 0.095 271.3)
- #524100
#524100
oklch(38.2% 0.078 91.9)
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 #313E75, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.035
- Cobalt #1E488F ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.052
- Marine Blue #01386A ΔE 0.054
- Light Navy #155084 ΔE 0.056
- Dark Grey Blue #29465B ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.064
- Blueberry #464196 ΔE 0.065
Use #313E75 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.