#313A7F
Closest named color: Twilight Blue (#0A437A). oklch(38.1% 0.116 274), rgb(49, 58, 127).
Aa
White text reads best on this color (10.28:1).
About this color
#313A7F is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.116 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.042 away. White text reads best on it, at 10.28:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.04:1 |
| White text | 10.28:1 |
Values
| HEX | #313A7F |
| RGB | rgb(49, 58, 127) |
| HSL | hsl(233, 44%, 35%) |
| OKLCH | oklch(38.1% 0.116 274) |
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 #313A7F | 10.28:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #313A7F | 2.04:1 | Fails | Lc 10.3 | Not readable |
| #313A7F text on white | 10.28:1 | AAA | Lc 93.6 | Preferred for body text |
| #313A7F text on black | 2.04:1 | Fails | Lc -8.9 | 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
#AFBDF9
oklch(80.9% 0.086 274.1)
-
Step 400
400
#8698F7
oklch(70.6% 0.14 274.1)
-
Step 500
500
#6A7CF3
oklch(63.1% 0.178 273.7)
-
Step 600
600
#5461E2
oklch(55.6% 0.194 273.9)
-
Step 700
700
#454FC4
oklch(49% 0.18 273.9)
-
Step 800
800
#39429E
oklch(42.7% 0.148 274.1)
-
Step 900
900 (this color)
#313A7F
oklch(38.1% 0.116 274)
-
Step 950
950
#1C224A
oklch(27% 0.074 274)
#313A7F 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) | #114481 | 0.038 |
| Deuteranopia (no green cones) | #003D7E | 0.041 |
| Tritanopia (no blue cones) | #004A56 | 0.102 |
| Achromatopsia (no color) | #414141 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313A7F
#313A7F
oklch(38.1% 0.116 274)
- #504100
#504100
oklch(38% 0.078 94.1)
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 #313A7F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.042
- Dark Slate Blue #483D8B ΔE 0.043
- Cobalt #1E488F ΔE 0.045
- Blueberry #464196 ΔE 0.054
- Marine Blue #01386A ΔE 0.060
- Light Navy #155084 ΔE 0.063
- Dusk Blue #26538D ΔE 0.070
- Sapphire #2138AB ΔE 0.075
Use #313A7F 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.