#313A80
Closest named color: Dark Slate Blue (#483D8B). oklch(38.2% 0.117 274), rgb(49, 58, 128).
Aa
White text reads best on this color (10.25:1).
About this color
#313A80 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.117 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.042 away. White text reads best on it, at 10.25:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.04:1 |
| White text | 10.25:1 |
Values
| HEX | #313A80 |
| RGB | rgb(49, 58, 128) |
| HSL | hsl(233, 45%, 35%) |
| OKLCH | oklch(38.2% 0.117 274) |
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 #313A80 | 10.25:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #313A80 | 2.04:1 | Fails | Lc 10.4 | Not readable |
| #313A80 text on white | 10.25:1 | AAA | Lc 93.5 | Preferred for body text |
| #313A80 text on black | 2.04:1 | Fails | Lc -9.0 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CFD8FA
oklch(88.6% 0.048 273.7)
-
Step 300
300
#AEBDFA
oklch(80.9% 0.088 273.6)
-
Step 400
400
#8698F8
oklch(70.7% 0.142 274.2)
-
Step 500
500
#6A7BF4
oklch(63% 0.18 274)
-
Step 600
600
#5461E3
oklch(55.6% 0.195 273.9)
-
Step 700
700
#454FC5
oklch(49.1% 0.182 273.9)
-
Step 800
800
#38429F
oklch(42.7% 0.15 273.6)
-
Step 900
900 (this color)
#313A80
oklch(38.2% 0.117 274)
-
Step 950
950
#1C224A
oklch(27% 0.074 274)
#313A80 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) | #104482 | 0.038 |
| Deuteranopia (no green cones) | #003D7F | 0.041 |
| Tritanopia (no blue cones) | #004A57 | 0.101 |
| Achromatopsia (no color) | #414141 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313A80
#313A80
oklch(38.2% 0.117 274)
- #514100
#514100
oklch(38.1% 0.078 93)
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 #313A80, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.042
- Twilight Blue #0A437A ΔE 0.042
- Cobalt #1E488F ΔE 0.045
- Blueberry #464196 ΔE 0.053
- Marine Blue #01386A ΔE 0.061
- Light Navy #155084 ΔE 0.063
- Dusk Blue #26538D ΔE 0.070
- Sapphire #2138AB ΔE 0.073
Use #313A80 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.