#313F51
Closest named color: Charcoal (#264653). oklch(36.3% 0.036 254.9), rgb(49, 63, 81).
Aa
White text reads best on this color (10.71:1).
About this color
#313F51 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.036 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Charcoal (#264653), ΔE 0.024 away. White text reads best on it, at 10.71:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Charcoal (#264653) |
| Black text | 1.96:1 |
| White text | 10.71:1 |
Values
| HEX | #313F51 |
| RGB | rgb(49, 63, 81) |
| HSL | hsl(214, 25%, 25%) |
| OKLCH | oklch(36.3% 0.036 254.9) |
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 #313F51 | 10.71:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #313F51 | 1.96:1 | Fails | Lc 9.1 | Not readable |
| #313F51 text on white | 10.71:1 | AAA | Lc 94.8 | Preferred for body text |
| #313F51 text on black | 1.96:1 | Fails | Lc -7.8 | 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
#F4F6F8
oklch(97.2% 0.003 247.9)
-
Step 100
100
#E6EAEF
oklch(93.5% 0.008 253.9)
-
Step 200
200
#D3DAE3
oklch(88.6% 0.015 254.6)
-
Step 300
300
#B5C2D2
oklch(80.9% 0.027 253.6)
-
Step 400
400
#8FA2BC
oklch(70.6% 0.044 256.3)
-
Step 500
500
#738BAB
oklch(63% 0.056 255.7)
-
Step 600
600
#5B7597
oklch(55.6% 0.061 255.3)
-
Step 700
700
#4B6280
oklch(49% 0.056 255.3)
-
Step 800
800
#3E5068
oklch(42.6% 0.046 255.8)
-
Step 900
900 (this color)
#313F51
oklch(36.3% 0.036 254.9)
-
Step 950
950
#1F2732
oklch(27% 0.024 256.4)
#313F51 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) | #384052 | 0.011 |
| Deuteranopia (no green cones) | #353D51 | 0.008 |
| Tritanopia (no blue cones) | #274345 | 0.032 |
| Achromatopsia (no color) | #3E3E3E | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313F51
#313F51
oklch(36.3% 0.036 254.9)
- #493B28
#493B28
oklch(36.2% 0.036 74.7)
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 #313F51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal #264653 ΔE 0.024
- Dark Grey Blue #29465B ΔE 0.025
- Dark Blue Grey #1F3B4D ΔE 0.029
- Onyx #343A40 ΔE 0.029
- Charcoal Grey #3C4142 ΔE 0.033
- Midnight Green #073B4C ΔE 0.047
- Prussian Blue #1D3557 ΔE 0.047
- Gunmetal #293241 ΔE 0.048
Use #313F51 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.