#313F7A
Closest named color: Twilight Blue (#0A437A). oklch(38.8% 0.101 271), rgb(49, 63, 122).
Aa
White text reads best on this color (9.89:1).
About this color
#313F7A is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.101 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.035 away. White text reads best on it, at 9.89:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.12:1 |
| White text | 9.89:1 |
Values
| HEX | #313F7A |
| RGB | rgb(49, 63, 122) |
| HSL | hsl(228, 43%, 34%) |
| OKLCH | oklch(38.8% 0.101 271) |
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 #313F7A | 9.89:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #313F7A | 2.12:1 | Fails | Lc 11.2 | Not readable |
| #313F7A text on white | 9.89:1 | AAA | Lc 92.8 | Preferred for body text |
| #313F7A text on black | 2.12:1 | Fails | Lc -9.7 | 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
#E4E9F9
oklch(93.5% 0.022 272.1)
-
Step 200
200
#CFD8F6
oklch(88.5% 0.042 272.3)
-
Step 300
300
#AEBFF3
oklch(81% 0.076 270.6)
-
Step 400
400
#859CEC
oklch(70.8% 0.12 270.9)
-
Step 500
500
#6881E6
oklch(63.2% 0.154 271)
-
Step 600
600
#5168D4
oklch(55.7% 0.167 271)
-
Step 700
700
#4255B8
oklch(49% 0.157 271.3)
-
Step 800
800
#364695
oklch(42.6% 0.13 271.2)
-
Step 900
900 (this color)
#313F7A
oklch(38.8% 0.101 271)
-
Step 950
950
#1B2445
oklch(27.1% 0.063 270.3)
#313F7A 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) | #23467C | 0.023 |
| Deuteranopia (no green cones) | #194079 | 0.026 |
| Tritanopia (no blue cones) | #004C56 | 0.091 |
| Achromatopsia (no color) | #434343 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313F7A
#313F7A
oklch(38.8% 0.101 271)
- #544200
#544200
oklch(38.7% 0.079 91.1)
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 #313F7A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.035
- Cobalt #1E488F ΔE 0.042
- Dark Slate Blue #483D8B ΔE 0.046
- Light Navy #155084 ΔE 0.051
- Blueberry #464196 ΔE 0.057
- Marine Blue #01386A ΔE 0.059
- Dusk Blue #26538D ΔE 0.060
- Dark Grey Blue #29465B ΔE 0.063
Use #313F7A 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.