#343D57
Closest named color: Dark Grey Blue (#29465B). oklch(36.4% 0.047 269.3), rgb(52, 61, 87).
Aa
White text reads best on this color (10.76:1).
About this color
#343D57 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.047 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.029 away. White text reads best on it, at 10.76:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.95:1 |
| White text | 10.76:1 |
Values
| HEX | #343D57 |
| RGB | rgb(52, 61, 87) |
| HSL | hsl(225, 25%, 27%) |
| OKLCH | oklch(36.4% 0.047 269.3) |
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 #343D57 | 10.76:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #343D57 | 1.95:1 | Fails | Lc 9.0 | Not readable |
| #343D57 text on white | 10.76:1 | AAA | Lc 94.9 | Preferred for body text |
| #343D57 text on black | 1.95:1 | Fails | Lc -7.7 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7EAF1
oklch(93.7% 0.01 267.4)
-
Step 200
200
#D4D9E6
oklch(88.5% 0.019 269.1)
-
Step 300
300
#B7C0D8
oklch(80.8% 0.035 269.2)
-
Step 400
400
#92A0C4
oklch(70.7% 0.055 268.3)
-
Step 500
500
#7888B6
oklch(63.2% 0.072 269.5)
-
Step 600
600
#6171A1
oklch(55.5% 0.077 269.6)
-
Step 700
700
#505F8A
oklch(49.2% 0.072 269)
-
Step 800
800
#424D70
oklch(42.6% 0.06 270.3)
-
Step 900
900 (this color)
#343D57
oklch(36.4% 0.047 269.3)
-
Step 950
950
#202635
oklch(27% 0.029 267.5)
#343D57 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) | #343F58 | 0.006 |
| Deuteranopia (no green cones) | #313C56 | 0.006 |
| Tritanopia (no blue cones) | #294246 | 0.042 |
| Achromatopsia (no color) | #3E3E3E | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343D57
#343D57
oklch(36.4% 0.047 269.3)
- #483D20
#483D20
oklch(36.4% 0.047 89.2)
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 #343D57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.035
- Charcoal #264653 ΔE 0.035
- Onyx #343A40 ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.043
- Charcoal Grey #3C4142 ΔE 0.044
- Gunmetal #293241 ΔE 0.051
- Midnight Green #073B4C ΔE 0.053
Use #343D57 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.