#313F7D
Closest named color: Twilight Blue (#0A437A). oklch(39% 0.106 271.2), rgb(49, 63, 125).
Aa
White text reads best on this color (9.82:1).
About this color
#313F7D is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.106 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.036 away. White text reads best on it, at 9.82:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.13:1 |
| White text | 9.82:1 |
Values
| HEX | #313F7D |
| RGB | rgb(49, 63, 125) |
| HSL | hsl(229, 44%, 34%) |
| OKLCH | oklch(39% 0.106 271.2) |
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 #313F7D | 9.82:1 | AAA | Lc -96.8 | Preferred for body text |
| Black text on #313F7D | 2.13:1 | Fails | Lc 11.4 | Not readable |
| #313F7D text on white | 9.82:1 | AAA | Lc 92.6 | Preferred for body text |
| #313F7D text on black | 2.13:1 | Fails | Lc -9.9 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CED8F7
oklch(88.4% 0.044 271.3)
-
Step 300
300
#AEBEF5
oklch(80.9% 0.08 271.9)
-
Step 400
400
#849BF0
oklch(70.7% 0.127 271.3)
-
Step 500
500
#6780EA
oklch(63.2% 0.161 271.2)
-
Step 600
600
#5066D9
oklch(55.6% 0.177 271.3)
-
Step 700
700
#4154BC
oklch(49.1% 0.164 271.2)
-
Step 800
800
#354698
oklch(42.8% 0.135 270.8)
-
Step 900
900 (this color)
#313F7D
oklch(39% 0.106 271.2)
-
Step 950
950
#1B2347
oklch(27% 0.068 271.8)
#313F7D 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) | #21477F | 0.026 |
| Deuteranopia (no green cones) | #15407C | 0.029 |
| Tritanopia (no blue cones) | #004D58 | 0.093 |
| Achromatopsia (no color) | #434343 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313F7D
#313F7D
oklch(39% 0.106 271.2)
- #554300
#554300
oklch(39.1% 0.08 91.4)
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 #313F7D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.036
- Cobalt #1E488F ΔE 0.039
- Dark Slate Blue #483D8B ΔE 0.043
- Light Navy #155084 ΔE 0.051
- Blueberry #464196 ΔE 0.053
- Dusk Blue #26538D ΔE 0.059
- Marine Blue #01386A ΔE 0.061
- Deep Sea Blue #015482 ΔE 0.064
Use #313F7D 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.