#343A55
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.5% 0.048 274.1), rgb(52, 58, 85).
Aa
White text reads best on this color (11.15:1).
About this color
#343A55 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.048 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.033 away. White text reads best on it, at 11.15:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.88:1 |
| White text | 11.15:1 |
Values
| HEX | #343A55 |
| RGB | rgb(52, 58, 85) |
| HSL | hsl(229, 24%, 27%) |
| OKLCH | oklch(35.5% 0.048 274.1) |
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 #343A55 | 11.15:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #343A55 | 1.88:1 | Fails | Lc 8.1 | Not readable |
| #343A55 text on white | 11.15:1 | AAA | Lc 95.8 | Preferred for body text |
| #343A55 text on black | 1.88:1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7E9F1
oklch(93.5% 0.011 274.9)
-
Step 200
200
#D5D8E7
oklch(88.4% 0.021 276.9)
-
Step 300
300
#B9BFD8
oklch(80.8% 0.036 274.9)
-
Step 400
400
#959FC5
oklch(70.8% 0.057 273.4)
-
Step 500
500
#7B86B6
oklch(63% 0.074 274.1)
-
Step 600
600
#6570A2
oklch(55.7% 0.079 274.1)
-
Step 700
700
#545D8B
oklch(49.1% 0.075 274.9)
-
Step 800
800
#444C71
oklch(42.6% 0.062 274.1)
-
Step 900
900 (this color)
#343A55
oklch(35.5% 0.048 274.1)
-
Step 950
950
#222535
oklch(26.9% 0.03 276)
#343A55 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) | #313D56 | 0.010 |
| Deuteranopia (no green cones) | #2F3A54 | 0.008 |
| Tritanopia (no blue cones) | #2A3F44 | 0.042 |
| Achromatopsia (no color) | #3B3B3B | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343A55
#343A55
oklch(35.5% 0.048 274.1)
- #443B1D
#443B1D
oklch(35.4% 0.047 93.1)
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 #343A55, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.033
- Onyx #343A40 ΔE 0.038
- Dark Grey Blue #29465B ΔE 0.038
- Prussian Blue #1D3557 ΔE 0.038
- Charcoal #264653 ΔE 0.042
- Gunmetal #293241 ΔE 0.045
- Charcoal Grey #3C4142 ΔE 0.048
- Space Cadet #2B2D42 ΔE 0.051
Use #343A55 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.