#313B61
Closest named color: Prussian Blue (#1D3557). oklch(36.2% 0.067 271.5), rgb(49, 59, 97).
Aa
White text reads best on this color (10.88:1).
About this color
#313B61 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.067 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.038 away. White text reads best on it, at 10.88:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.067) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.92:1 |
| White text | 10.88:1 |
Values
| HEX | #313B61 |
| RGB | rgb(49, 59, 97) |
| HSL | hsl(228, 33%, 29%) |
| OKLCH | oklch(36.2% 0.067 271.5) |
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 #313B61 | 10.88:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #313B61 | 1.92:1 | Fails | Lc 8.8 | Not readable |
| #313B61 text on white | 10.88:1 | AAA | Lc 95.1 | Preferred for body text |
| #313B61 text on black | 1.92:1 | Fails | Lc -7.5 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D2D9EC
oklch(88.6% 0.027 269.6)
-
Step 300
300
#B5BFE2
oklch(80.8% 0.051 272.7)
-
Step 400
400
#8E9ED4
oklch(70.7% 0.081 271.5)
-
Step 500
500
#7385C8
oklch(63% 0.103 271.7)
-
Step 600
600
#5C6EB5
oklch(55.6% 0.112 271.6)
-
Step 700
700
#4C5C9C
oklch(49.2% 0.104 271.5)
-
Step 800
800
#3E4B7E
oklch(42.7% 0.086 271.5)
-
Step 900
900 (this color)
#313B61
oklch(36.2% 0.067 271.5)
-
Step 950
950
#1F253B
oklch(27% 0.042 271.7)
#313B61 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) | #2D3F63 | 0.013 |
| Deuteranopia (no green cones) | #283B60 | 0.013 |
| Tritanopia (no blue cones) | #1F4349 | 0.060 |
| Achromatopsia (no color) | #3D3D3D | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313B61
#313B61
oklch(36.2% 0.067 271.5)
- #4B3C0B
#4B3C0B
oklch(36.3% 0.067 90.9)
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 #313B61, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.038
- Dark Grey Blue #29465B ΔE 0.040
- Dark Blue Grey #1F3B4D ΔE 0.045
- Marine Blue #01386A ΔE 0.050
- Charcoal #264653 ΔE 0.050
- Twilight Blue #0A437A ΔE 0.053
- Onyx #343A40 ΔE 0.058
- Midnight Green #073B4C ΔE 0.059
Use #313B61 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.