#313C9D
Closest named color: Sapphire (#2138AB). oklch(41% 0.156 272.5), rgb(49, 60, 157).
Aa
White text reads best on this color (9.27:1).
About this color
#313C9D is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.156 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.031 away. White text reads best on it, at 9.27:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.26:1 |
| White text | 9.27:1 |
Values
| HEX | #313C9D |
| RGB | rgb(49, 60, 157) |
| HSL | hsl(234, 52%, 40%) |
| OKLCH | oklch(41% 0.156 272.5) |
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 #313C9D | 9.27:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #313C9D | 2.26:1 | Fails | Lc 13.0 | Not readable |
| #313C9D text on white | 9.27:1 | AAA | Lc 90.9 | Preferred for body text |
| #313C9D text on black | 2.26:1 | Fails | Lc -11.4 | 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 800.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CDD8FC
oklch(88.5% 0.051 271.9)
-
Step 300
300
#ACBDFC
oklch(80.8% 0.091 272.6)
-
Step 400
400
#8299FB
oklch(70.8% 0.146 272.2)
-
Step 500
500
#657BF8
oklch(63% 0.187 272.4)
-
Step 600
600
#4F60E7
oklch(55.5% 0.203 272.5)
-
Step 700
700
#414FC9
oklch(49.2% 0.188 272.4)
-
Step 800
800 (this color)
#313C9D
oklch(41% 0.156 272.5)
-
Step 900
900
#2D3981
oklch(37.8% 0.121 272.2)
-
Step 950
950
#1A224C
oklch(27.1% 0.078 272.1)
#313C9D 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) | #004CA0 | 0.047 |
| Deuteranopia (no green cones) | #00429B | 0.037 |
| Tritanopia (no blue cones) | #005466 | 0.127 |
| Achromatopsia (no color) | #474747 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313C9D
#313C9D
oklch(41% 0.156 272.5)
- #5A4800
#5A4800
oklch(40.9% 0.084 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 #313C9D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.031
- Blueberry #464196 ΔE 0.037
- Cobalt #1E488F ΔE 0.042
- Dark Slate Blue #483D8B ΔE 0.046
- Indigo Blue #3A18B1 ΔE 0.066
- Dusk Blue #26538D ΔE 0.069
- Blue Blue #2242C7 ΔE 0.070
- Twilight Blue #0A437A ΔE 0.071
Use #313C9D 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.