#313B8C
Closest named color: Dark Slate Blue (#483D8B). oklch(39.3% 0.134 273.3), rgb(49, 59, 140).
Aa
White text reads best on this color (9.83:1).
About this color
#313B8C is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.134 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.037 away. White text reads best on it, at 9.83:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.13:1 |
| White text | 9.83:1 |
Values
| HEX | #313B8C |
| RGB | rgb(49, 59, 140) |
| HSL | hsl(233, 48%, 37%) |
| OKLCH | oklch(39.3% 0.134 273.3) |
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 #313B8C | 9.83:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #313B8C | 2.13:1 | Fails | Lc 11.5 | Not readable |
| #313B8C text on white | 9.83:1 | AAA | Lc 92.5 | Preferred for body text |
| #313B8C text on black | 2.13:1 | Fails | Lc -10.0 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FE
oklch(93.6% 0.029 273.1)
-
Step 200
200
#CDD7FF
oklch(88.4% 0.056 274.2)
-
Step 300
300
#ACBDFF
oklch(80.9% 0.095 273)
-
Step 400
400
#8297FF
oklch(70.6% 0.154 273.2)
-
Step 500
500
#6679FF
oklch(63.1% 0.198 273.3)
-
Step 600
600
#505BF2
oklch(55.6% 0.223 273.4)
-
Step 700
700
#4149D3
oklch(49% 0.208 273.2)
-
Step 800
800
#353EAA
oklch(42.7% 0.171 273.1)
-
Step 900
900 (this color)
#313B8C
oklch(39.3% 0.134 273.3)
-
Step 950
950
#1A214F
oklch(27.1% 0.084 273)
#313B8C 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) | #00488F | 0.045 |
| Deuteranopia (no green cones) | #003F8A | 0.039 |
| Tritanopia (no blue cones) | #004E5D | 0.112 |
| Achromatopsia (no color) | #434343 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313B8C
#313B8C
oklch(39.3% 0.134 273.3)
- #554400
#554400
oklch(39.3% 0.08 92.6)
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 #313B8C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.037
- Cobalt #1E488F ΔE 0.037
- Blueberry #464196 ΔE 0.040
- Twilight Blue #0A437A ΔE 0.051
- Sapphire #2138AB ΔE 0.055
- Light Navy #155084 ΔE 0.063
- Dusk Blue #26538D ΔE 0.066
- Marine Blue #01386A ΔE 0.076
Use #313B8C 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.