#313A4F
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35% 0.039 266.4), rgb(49, 58, 79).
Aa
White text reads best on this color (11.35:1).
About this color
#313A4F is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.039 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.024 away. White text reads best on it, at 11.35:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.84:1 |
| White text | 11.35:1 |
Values
| HEX | #313A4F |
| RGB | rgb(49, 58, 79) |
| HSL | hsl(222, 23%, 25%) |
| OKLCH | oklch(35% 0.039 266.4) |
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 #313A4F | 11.35:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #313A4F | 1.84:1 | Fails | Lc 7.7 | Not readable |
| #313A4F text on white | 11.35:1 | AAA | Lc 96.2 | Preferred for body text |
| #313A4F text on black | 1.84:1 | Fails | Lc 0.0 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAF0
oklch(93.6% 0.009 264.5)
-
Step 200
200
#D4D9E4
oklch(88.5% 0.016 266.3)
-
Step 300
300
#B8C1D4
oklch(81% 0.029 265.4)
-
Step 400
400
#93A0BE
oklch(70.6% 0.046 266.7)
-
Step 500
500
#7989AE
oklch(63.1% 0.059 266.5)
-
Step 600
600
#62739A
oklch(55.7% 0.064 266.1)
-
Step 700
700
#516083
oklch(49.1% 0.059 266.3)
-
Step 800
800
#424E6B
oklch(42.6% 0.051 266.9)
-
Step 900
900 (this color)
#313A4F
oklch(35% 0.039 266.4)
-
Step 950
950
#212633
oklch(27% 0.025 268.3)
#313A4F 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) | #333C50 | 0.007 |
| Deuteranopia (no green cones) | #30394F | 0.004 |
| Tritanopia (no blue cones) | #283E41 | 0.035 |
| Achromatopsia (no color) | #3A3A3A | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313A4F
#313A4F
oklch(35% 0.039 266.4)
- #433922
#433922
oklch(34.9% 0.039 86.9)
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 #313A4F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.024
- Onyx #343A40 ΔE 0.027
- Gunmetal #293241 ΔE 0.036
- Prussian Blue #1D3557 ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.039
- Charcoal #264653 ΔE 0.039
- Charcoal Grey #3C4142 ΔE 0.041
- Midnight Green #073B4C ΔE 0.044
Use #313A4F 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.