#313C86
Closest named color: Cobalt (#1E488F). oklch(39% 0.124 273), rgb(49, 60, 134).
Aa
White text reads best on this color (9.90:1).
About this color
#313C86 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.124 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.037 away. White text reads best on it, at 9.90:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.12:1 |
| White text | 9.90:1 |
Values
| HEX | #313C86 |
| RGB | rgb(49, 60, 134) |
| HSL | hsl(232, 46%, 36%) |
| OKLCH | oklch(39% 0.124 273) |
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 #313C86 | 9.90:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #313C86 | 2.12:1 | Fails | Lc 11.3 | Not readable |
| #313C86 text on white | 9.90:1 | AAA | Lc 92.7 | Preferred for body text |
| #313C86 text on black | 2.12:1 | Fails | Lc -9.8 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CDD8FC
oklch(88.5% 0.051 271.9)
-
Step 300
300
#ACBDFD
oklch(80.9% 0.093 272.7)
-
Step 400
400
#8398FC
oklch(70.7% 0.148 273.1)
-
Step 500
500
#667BFA
oklch(63.2% 0.189 272.8)
-
Step 600
600
#505FE9
oklch(55.5% 0.207 272.9)
-
Step 700
700
#424ECB
oklch(49.2% 0.192 272.9)
-
Step 800
800
#3641A4
oklch(42.8% 0.158 272.9)
-
Step 900
900 (this color)
#313C86
oklch(39% 0.124 273)
-
Step 950
950
#1B224C
oklch(27.1% 0.078 273)
#313C86 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) | #0B4789 | 0.040 |
| Deuteranopia (no green cones) | #003F84 | 0.040 |
| Tritanopia (no blue cones) | #004D5B | 0.105 |
| Achromatopsia (no color) | #434343 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313C86
#313C86
oklch(39% 0.124 273)
- #544300
#544300
oklch(39% 0.08 92.4)
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 #313C86, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.037
- Dark Slate Blue #483D8B ΔE 0.037
- Twilight Blue #0A437A ΔE 0.044
- Blueberry #464196 ΔE 0.044
- Light Navy #155084 ΔE 0.059
- Dusk Blue #26538D ΔE 0.063
- Sapphire #2138AB ΔE 0.064
- Marine Blue #01386A ΔE 0.068
Use #313C86 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.