#313C57
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.9% 0.049 266.9), rgb(49, 60, 87).
Aa
White text reads best on this color (10.96:1).
About this color
#313C57 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.049 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.031 away. White text reads best on it, at 10.96:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.91:1 |
| White text | 10.96:1 |
Values
| HEX | #313C57 |
| RGB | rgb(49, 60, 87) |
| HSL | hsl(223, 28%, 27%) |
| OKLCH | oklch(35.9% 0.049 266.9) |
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 #313C57 | 10.96:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #313C57 | 1.91:1 | Fails | Lc 8.5 | Not readable |
| #313C57 text on white | 10.96:1 | AAA | Lc 95.4 | Preferred for body text |
| #313C57 text on black | 1.91:1 | Fails | Lc -7.3 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF1
oklch(93.6% 0.01 261.8)
-
Step 200
200
#D3D9E7
oklch(88.5% 0.02 267.3)
-
Step 300
300
#B6C1D9
oklch(81% 0.036 265.9)
-
Step 400
400
#90A0C6
oklch(70.7% 0.059 267)
-
Step 500
500
#7588B8
oklch(63% 0.076 267.5)
-
Step 600
600
#5D72A4
oklch(55.6% 0.082 266.3)
-
Step 700
700
#4D5F8D
oklch(49.1% 0.077 267.2)
-
Step 800
800
#3F4E72
oklch(42.7% 0.063 266.5)
-
Step 900
900 (this color)
#313C57
oklch(35.9% 0.049 266.9)
-
Step 950
950
#1F2636
oklch(26.9% 0.032 266.1)
#313C57 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) | #333E58 | 0.007 |
| Deuteranopia (no green cones) | #2F3B56 | 0.005 |
| Tritanopia (no blue cones) | #244245 | 0.046 |
| Achromatopsia (no color) | #3C3C3C | 0.049 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313C57
#313C57
oklch(35.9% 0.049 266.9)
- #483B1D
#483B1D
oklch(35.9% 0.049 86.5)
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 #313C57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.031
- Dark Grey Blue #29465B ΔE 0.031
- Charcoal #264653 ΔE 0.037
- Prussian Blue #1D3557 ΔE 0.037
- Onyx #343A40 ΔE 0.039
- Charcoal Grey #3C4142 ΔE 0.047
- Gunmetal #293241 ΔE 0.048
- Midnight Green #073B4C ΔE 0.049
Use #313C57 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.